206AB-SERIES-MM_Rev_5_31-Jul-2009

8/10/2019 206AB-SERIES-MM_Rev_5_31-Jul-2009

1/108

This Revision 5 updates the front matter, Chapter 29, and Chapter 67. The Index

following Chapter 5 has also been deleted.

Please incorporate the attached pages into the existing Maintenance Manual inaccordance with the revised Log of Pages (attached).

Bell Helicopter would also like to thank its Customers for providing us withCustomer Feedback information. This information is very much appreciated and

allows us to improve the quality of our manuals with each revision.

7 JANUARY 1998

REVISION 5 31 JULY 2009

NOTICE

REVISION ONLY BHT-206A/B-SERIES-MM


2/108


3/108

BHT-206A/B-SERIES-MM-1

NOTICE

The instructions set forth in this manual, as supplemented or modified by Alert Service Bulletins (ASB) or

other directions issued by Bell Helicopter Textron Inc. and Airworthiness Directives (AD) issued by the

applicable regulatory agencies, shall be strictly followed. This manual covers 206A, 206B, and 206B3

helicopters SN 4 through and including current production. TH-57/TH-67 helicopters are covered alongwith the use of manual supplements. 206B1 helicopters are not covered by this manual.

FOR MODELS 206A, 206B, AND 206B3 HELICOPTERS

MAINTENANCE MANUAL

VOLUME 1

GENERAL INFORMATION


4/108


5/108


NOTICE






MAINTENANCE MANUAL

VOLUME 1

GENERAL INFORMATION

7 JANUARY 1998


COPYRIGHT NOTICE

COPYRIGHT 2009

BELL HELICOPTER TEXTRON INC.

AND BELL HEL ICOPTER TEXTRON

CANADA LTD.

ALL RIG HTS RESERVE D


6/108


PN Rev. 5 31 JUL 2009

Additional copies of this publication may be obtained by contacting:

Commercial Publication Distribution Center

Bell Helicopter Textron Inc.

P. O. Box 482

Fort Worth, Texas 76101-0482

PROPRIETARY RIGHTS NOTICE

These data are proprietary to Bell Helicopter Textron Inc. Disclosure,

reproduction, or use of these data for any purpose other than helicopter

operation or maintenance is forbidden without prior written authorization from


DESTINATION CONTROL STATEMENT

These commodities, technology, or software were exported from the United

States in accordance with the Export Administration Regulations (EAR).

Diversion contrary to U.S. law prohibited. The data contained in this manual are

classified as ECCN EAR99.


7/108


31 JUL 2009 Rev. 5 Warning

WARNING

THIS MANUAL APPLIES ONLY TO HELICOPTERS AND COMPONENTS

MAINTAINED IN ACCORDANCE WITH BELL HELICOPTER TEXTRON

(BELL) APPROVED PROCEDURES USING BELL APPROVED PARTS.

ALL INSPECTION, REPAIR AND OVERHAUL PROCEDURES PUBLISHED

BY BELL, INCLUDING PART RETIREMENT LIFE, ARE BASED SOLELY ON

THE USE OF BELL PARTS THAT HAVE BEEN MAINTAINED USING BELL

APPROVED DATA. THE DATA PUBLISHED HEREIN OR OTHERWISE

SUPPLIED BY BELL IS NOT APPLICABLE TO NON-BELL PARTS OR

PARTS THAT HAVE BEEN REPAIRED USING DATA AND/OR PROCESSES

NOT APPROVED BY BELL.

BELL IS NOT RESPONSIBLE FOR ANY PART OTHER THAN THOSE THAT

IT HAS APPROVED.

BEFORE PERFORMING ANY PROCEDURE CONTAINED IN THIS MANUAL

YOU MUST INSPECT THE AFFECTED PARTS AND RECORDS FOR

EVIDENCE OF ANY MANUFACTURE, REPAIR, REWORK OR USE OF A

PROCESS NOT APPROVED BY BELL.

IF YOU IDENTIFY OR SUSPECT THE USE OF PARTS NOT AUTHORIZED

BY BELL, EITHER REMOVE THE AFFECTED ITEM FROM THE AIRCRAFT

OR OBTAIN INSTRUCTIONS FOR CONTINUED AIRWORTHINESS FROM

THE MANUFACTURER OR THE ORGANIZATION THAT APPROVED THE

REPAIR.


8/108

CUSTOMER SUPPORT AND SERVICES

Flying smart means that no matter where you are, or what time it is, you can make a call

and get additional information, clarification, or advice on a technical or operational issue

concerning your helicopter or information contained in our Technical Publications.

Product Support Engineering (PSE) is just a phone call away and may be contacted as

follows:

For additional information on Customer Support and Services as well as Product Support

Engineering (PSE) and your local Customer Service Representative (CSR) network,please access http://www.bellhelicopter.com/en/support.

MODEL 47, 206, OR 407

Phone: 450-437-2862 or 800-243-6407 (U.S./Canada)

Fax: 450-433-0272

E-mail: [email protected]

MODEL 222, 230, 427, 429, OR 430


Fax: 450-433-0272


MODEL 204, 205, 212, OR 412


Fax: 450-433-0272


MODEL 210, 214, HUEY II, SURPLUS MILITARY

Phone: 817-280-3548

Fax: 817-280-2635



CSS Rev. 5 31 JUL 2009


9/108


LOG OF REVISIONS

Insert latest revision pages and dispose of superseded ones.

On a revised page, the text and/or illustration affected by the latest revision is shown by a vertical line. A revised

page with only a vertical line next to the page number indicates that text has shifted or that non-technica

correction(s) were made on that page.

Page No. Rev No. Page No. Rev No. Page No. Rev No

LOG OF PAGES

Original . . . .0 . . . . . . 07 JAN 98

Revision. . . . 1 . . . . . . 21 MAY 02

Revision . . . 2 . . . . . . 07 JUN 02

Revision . . . 3 . . . . . . 12 JUL 04

Revision . . . 4 . . . . . 28 APR 06

Revision . . . 5 . . . . . . 31 JUL 09

VOLUME 1

Cover . . . . . . . . . . . . . . . . . . . . .5

Title . . . . . . . . . . . . . . . . . . . . . .5

PN . . . . . . . . . . . . . . . . . . . . . . .5

Warning . . . . . . . . . . . . . . . . . . .5

CSS . . . . . . . . . . . . . . . . . . . . . .5

A D . . . . . . . . . . . . . . . . . . . . .5

Help . . . . . . . . . . . . . . . . . . . . . .4

Customer Feedback. . . . . . . . . .4

Helicopter Sale Notice . . . . . . . .5

Warranty. . . . . . . . . . . . . . . . . . .5

BR . . . . . . . . . . . . . . . . . . . . . . .5

TR . . . . . . . . . . . . . . . . . . . . . . .4

Chapter 1

1/2 . . . . . . . . . . . . . . . . . . . . . . .0

3 8 . . . . . . . . . . . . . . . . . . . . . .0

9/10 . . . . . . . . . . . . . . . . . . . . . .0

Chapter 4

1/2 . . . . . . . . . . . . . . . . . . . . . . .1

3 10. . . . . . . . . . . . . . . . . . . . .1

11/12 . . . . . . . . . . . . . . . . . . . . .1

Chapter 5

1 4 . . . . . . . . . . . . . . . . . . . . . .0

5/6 . . . . . . . . . . . . . . . . . . . . . . .07 12. . . . . . . . . . . . . . . . . . . . .0

13 16. . . . . . . . . . . . . . . . . . . .4

16A 16B . . . . . . . . . . . . . . . . .4

17 18. . . . . . . . . . . . . . . . . . . .0

19/20 . . . . . . . . . . . . . . . . . . . . .0

21/22 . . . . . . . . . . . . . . . . . . . . .0

23/24 . . . . . . . . . . . . . . . . . . . . .0

25/26 . . . . . . . . . . . . . . . . . . . . .0

27/28. . . . . . . . . . . . . . . . . . . . . 0

29 30 . . . . . . . . . . . . . . . . . . . 0

31/32. . . . . . . . . . . . . . . . . . . . . 0

33/34. . . . . . . . . . . . . . . . . . . . . 0

35/36. . . . . . . . . . . . . . . . . . . . . 0

37/38. . . . . . . . . . . . . . . . . . . . . 0

39 40 . . . . . . . . . . . . . . . . . . . 0

41/42. . . . . . . . . . . . . . . . . . . . . 0

43/44. . . . . . . . . . . . . . . . . . . . . 0

45 48 . . . . . . . . . . . . . . . . . . . 0

49/50. . . . . . . . . . . . . . . . . . . . . 0

51 52 . . . . . . . . . . . . . . . . . . . 0

53/54. . . . . . . . . . . . . . . . . . . . . 0

55 56 . . . . . . . . . . . . . . . . . . . 057/58. . . . . . . . . . . . . . . . . . . . . 0

59/60. . . . . . . . . . . . . . . . . . . . . 0

61 62 . . . . . . . . . . . . . . . . . . . 0

63/64. . . . . . . . . . . . . . . . . . . . . 0

65/66. . . . . . . . . . . . . . . . . . . . . 0

67/68. . . . . . . . . . . . . . . . . . . . . 1

69/70. . . . . . . . . . . . . . . . . . . . . 0

71/72. . . . . . . . . . . . . . . . . . . . . 0

73 82 . . . . . . . . . . . . . . . . . . . 0

83/84. . . . . . . . . . . . . . . . . . . . . 0

85 94 . . . . . . . . . . . . . . . . . . . 0

95 96 . . . . . . . . . . . . . . . . . . . 4

97/98. . . . . . . . . . . . . . . . . . . . . 4

Index MM

1 16 (Deleted) . . . . . . . . . . . . 5

VOLUME 2

Cover . . . . . . . . . . . . . . . . . . . . 0

Title. . . . . . . . . . . . . . . . . . . . . . 4

PN. . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 6

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 6 . . . . . . . . . . . . . . . . . . . . . 0

7/8 . . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 7

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 0

5/6 . . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 8

1 32 . . . . . . . . . . . . . . . . . . . . 3

33/34. . . . . . . . . . . . . . . . . . . . . 3

Chapter 9

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 0

Chapter 10

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 0

5/6 . . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 11

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 3

5 12 . . . . . . . . . . . . . . . . . . . . 012A/B . . . . . . . . . . . . . . . . . . . . 3

13 16 . . . . . . . . . . . . . . . . . . . 0

17/18. . . . . . . . . . . . . . . . . . . . . 0

Chapter 12

1 2 . . . . . . . . . . . . . . . . . . . . . 4

3/4 . . . . . . . . . . . . . . . . . . . . . . . 4

5 6 . . . . . . . . . . . . . . . . . . . . . 4

31 JUL 2009 Rev. 5 A


10/108


LOG OF PAGES (CONT)

Page No. Rev No. Page No. Rev No. Page No. Rev No.

7/8. . . . . . . . . . . . . . . . . . . . . . . 4

9 14 . . . . . . . . . . . . . . . . . . . . 4

15/16. . . . . . . . . . . . . . . . . . . . . 417 26 . . . . . . . . . . . . . . . . . . . 4

27/28. . . . . . . . . . . . . . . . . . . . . 4

29 30 . . . . . . . . . . . . . . . . . . . 4

31/32. . . . . . . . . . . . . . . . . . . . . 4

33 38 . . . . . . . . . . . . . . . . . . . 4

39/40. . . . . . . . . . . . . . . . . . . . . 4

41 44 . . . . . . . . . . . . . . . . . . . 4

45/46. . . . . . . . . . . . . . . . . . . . . 4

VOLUME 3

Cover . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . . 4PN. . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 18

1 2 . . . . . . . . . . . . . . . . . . . . . 0

3/4. . . . . . . . . . . . . . . . . . . . . . . 0

5 24 . . . . . . . . . . . . . . . . . . . . 0

25/26. . . . . . . . . . . . . . . . . . . . . 0

27 34 . . . . . . . . . . . . . . . . . . . 0

35 36 . . . . . . . . . . . . . . . . . . . 4

37 38 . . . . . . . . . . . . . . . . . . . 0

38A/38B . . . . . . . . . . . . . . . . . . 4

39 58 . . . . . . . . . . . . . . . . . . . 0

59 60 . . . . . . . . . . . . . . . . . . . 460A/60B . . . . . . . . . . . . . . . . . . 4

61 70 . . . . . . . . . . . . . . . . . . . 0

71 72 . . . . . . . . . . . . . . . . . . . 4

73 78 . . . . . . . . . . . . . . . . . . . 0

79 80 . . . . . . . . . . . . . . . . . . . 4

Chapter 21

1 18 . . . . . . . . . . . . . . . . . . . . 0

Chapter 25

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 8 . . . . . . . . . . . . . . . . . . . . . 0

Chapter 26

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 0

5/6. . . . . . . . . . . . . . . . . . . . . . . 0

VOLUME 4

Cover . . . . . . . . . . . . . . . . . . . . 5

Title . . . . . . . . . . . . . . . . . . . . . . 5

PN. . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 281 40 . . . . . . . . . . . . . . . . . . . . 0

41/42 . . . . . . . . . . . . . . . . . . . . . 0

Chapter 29

1 2 . . . . . . . . . . . . . . . . . . . . . 5

3 8 . . . . . . . . . . . . . . . . . . . . . 0

9 10 . . . . . . . . . . . . . . . . . . . . 5

10A/10B . . . . . . . . . . . . . . . . . . 5

11 . . . . . . . . . . . . . . . . . . . . . . . 5

12 . . . . . . . . . . . . . . . . . . . . . . . 0

13 14 . . . . . . . . . . . . . . . . . . . 5

14A 14B . . . . . . . . . . . . . . . . . 5

14C/14D . . . . . . . . . . . . . . . . . . 5

15 20 . . . . . . . . . . . . . . . . . . . 5

20A/20B . . . . . . . . . . . . . . . . . . 5

21 22 . . . . . . . . . . . . . . . . . . . 5

23 31 . . . . . . . . . . . . . . . . . . . 0

32 . . . . . . . . . . . . . . . . . . . . . . . 5

VOLUME 5

Cover . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . . 4

PN. . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 301/2. . . . . . . . . . . . . . . . . . . . . . . 0

3/4. . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 32

1 22 . . . . . . . . . . . . . . . . . . . . 0

23/24 . . . . . . . . . . . . . . . . . . . . . 0

25 26 . . . . . . . . . . . . . . . . . . . 0

27/28 . . . . . . . . . . . . . . . . . . . . . 0

29 54 . . . . . . . . . . . . . . . . . . . 0

Chapter 52

1 42 . . . . . . . . . . . . . . . . . . . . 0

43/44 . . . . . . . . . . . . . . . . . . . . . 0

Chapter 53

1 10 . . . . . . . . . . . . . . . . . . . . 4

11/12 . . . . . . . . . . . . . . . . . . . . . 4

13 30 . . . . . . . . . . . . . . . . . . . 4

31/32 . . . . . . . . . . . . . . . . . . . . . 4

33 36 . . . . . . . . . . . . . . . . . . . 4

37/38 . . . . . . . . . . . . . . . . . . . . . 4

39 40. . . . . . . . . . . . . . . . . . . .4

VOLUME 6Cover. . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . .0

PN . . . . . . . . . . . . . . . . . . . . . . .0

Chapter 62

1 8. . . . . . . . . . . . . . . . . . . . . .0

9/10 . . . . . . . . . . . . . . . . . . . . . .0

11 12. . . . . . . . . . . . . . . . . . . . 0

13/14 . . . . . . . . . . . . . . . . . . . . .0

15 22. . . . . . . . . . . . . . . . . . . .0

23/24 . . . . . . . . . . . . . . . . . . . . .0

25 30. . . . . . . . . . . . . . . . . . . .031/32 . . . . . . . . . . . . . . . . . . . . .0

33 44. . . . . . . . . . . . . . . . . . . .0

45/46 . . . . . . . . . . . . . . . . . . . . .0

47 60. . . . . . . . . . . . . . . . . . . .0

61/62 . . . . . . . . . . . . . . . . . . . . .0

Chapter 63

1 2. . . . . . . . . . . . . . . . . . . . . .0

3/4 . . . . . . . . . . . . . . . . . . . . . . .0

5 56. . . . . . . . . . . . . . . . . . . . .0

VOLUME 7

Cover. . . . . . . . . . . . . . . . . . . . . 0Title . . . . . . . . . . . . . . . . . . . . . .0

PN . . . . . . . . . . . . . . . . . . . . . . .0

Chapter 64

1/2 . . . . . . . . . . . . . . . . . . . . . . .0

3/4 . . . . . . . . . . . . . . . . . . . . . . .0

5 20. . . . . . . . . . . . . . . . . . . . .0

21/22 . . . . . . . . . . . . . . . . . . . . .0

Chapter 65

1 12. . . . . . . . . . . . . . . . . . . . .0

13/14 . . . . . . . . . . . . . . . . . . . . .0

15 50. . . . . . . . . . . . . . . . . . . .0

51/52 . . . . . . . . . . . . . . . . . . . . .0

VOLUME 8

Cover. . . . . . . . . . . . . . . . . . . . . 5

Title . . . . . . . . . . . . . . . . . . . . . .5

PN . . . . . . . . . . . . . . . . . . . . . . .5

B Rev. 5 31 JUL 2009


11/108


LOG OF PAGES (CONT)

Page No. Rev No. Page No. Rev No. Page No. Rev No

Chapter 67

1 3 . . . . . . . . . . . . . . . . . . . . . .2

4 . . . . . . . . . . . . . . . . . . . . . . . . .55 8 . . . . . . . . . . . . . . . . . . . . . .0

9 10. . . . . . . . . . . . . . . . . . . . .5

10A/10B . . . . . . . . . . . . . . . . . . .5

11 12 . . . . . . . . . . . . . . . . . . . .0

13/14 . . . . . . . . . . . . . . . . . . . . .0

15 . . . . . . . . . . . . . . . . . . . . . . . .5

16 . . . . . . . . . . . . . . . . . . . . . . . .0

17/18 . . . . . . . . . . . . . . . . . . . . .0

19 22. . . . . . . . . . . . . . . . . . . .0

23/24 . . . . . . . . . . . . . . . . . . . . .0

25 27. . . . . . . . . . . . . . . . . . . .0

28 . . . . . . . . . . . . . . . . . . . . . . . .5

28A/28B . . . . . . . . . . . . . . . . . . .5

29 32. . . . . . . . . . . . . . . . . . . .5

32A/32B . . . . . . . . . . . . . . . . . . .5

33 39. . . . . . . . . . . . . . . . . . . .0

40 . . . . . . . . . . . . . . . . . . . . . . . .5

41 42. . . . . . . . . . . . . . . . . . . .0

43 46. . . . . . . . . . . . . . . . . . . .5

46A/46B . . . . . . . . . . . . . . . . . . .5

47 48. . . . . . . . . . . . . . . . . . . .0

49 50. . . . . . . . . . . . . . . . . . . .5

51 55. . . . . . . . . . . . . . . . . . . .0

56 58. . . . . . . . . . . . . . . . . . . .5

58A/58B . . . . . . . . . . . . . . . . . . .559 67. . . . . . . . . . . . . . . . . . . .0

68 71. . . . . . . . . . . . . . . . . . . .5

72 . . . . . . . . . . . . . . . . . . . . . . . .0

73/74 . . . . . . . . . . . . . . . . . . . . .0

75 78. . . . . . . . . . . . . . . . . . . .5

79 84. . . . . . . . . . . . . . . . . . . .0

85 . . . . . . . . . . . . . . . . . . . . . . . .5

86 90. . . . . . . . . . . . . . . . . . . .2

91/92 . . . . . . . . . . . . . . . . . . . . .2

93 101. . . . . . . . . . . . . . . . . . .2

102 104. . . . . . . . . . . . . . . . . .5

105 107. . . . . . . . . . . . . . . . . .2

108 . . . . . . . . . . . . . . . . . . . . . . .5109 118 . . . . . . . . . . . . . . . . . .2

VOLUME 9

Cover . . . . . . . . . . . . . . . . . . . . .0

Title . . . . . . . . . . . . . . . . . . . . . .2

PN . . . . . . . . . . . . . . . . . . . . . . .2

Chapter 71

1 14 . . . . . . . . . . . . . . . . . . . . 0

15/16. . . . . . . . . . . . . . . . . . . . . 017 22 . . . . . . . . . . . . . . . . . . . 0

23/24. . . . . . . . . . . . . . . . . . . . . 0

25 28 . . . . . . . . . . . . . . . . . . . 0

29/30. . . . . . . . . . . . . . . . . . . . . 0

31 50 . . . . . . . . . . . . . . . . . . . 0

51/52. . . . . . . . . . . . . . . . . . . . . 0

53 56 . . . . . . . . . . . . . . . . . . . 0

57/58. . . . . . . . . . . . . . . . . . . . . 0

59 84 . . . . . . . . . . . . . . . . . . . 0

85/86. . . . . . . . . . . . . . . . . . . . . 0

Chapter 75

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 6 . . . . . . . . . . . . . . . . . . . . . 0

Chapter 76

1 2 . . . . . . . . . . . . . . . . . . . . . 2

3/4. . . . . . . . . . . . . . . . . . . . . . . 2

5 34 . . . . . . . . . . . . . . . . . . . . 2

35/36. . . . . . . . . . . . . . . . . . . . . 2

37 42 . . . . . . . . . . . . . . . . . . . 2

43/44. . . . . . . . . . . . . . . . . . . . . 2

45/46. . . . . . . . . . . . . . . . . . . . . 2

47/48. . . . . . . . . . . . . . . . . . . . . 2

49/50. . . . . . . . . . . . . . . . . . . . . 251/52. . . . . . . . . . . . . . . . . . . . . 2

53/54. . . . . . . . . . . . . . . . . . . . . 2

55 68 . . . . . . . . . . . . . . . . . . . 2

69/70. . . . . . . . . . . . . . . . . . . . . 2

71/72. . . . . . . . . . . . . . . . . . . . . 2

73/74. . . . . . . . . . . . . . . . . . . . . 2

75/76. . . . . . . . . . . . . . . . . . . . . 2

77 82 . . . . . . . . . . . . . . . . . . . 2

83/84. . . . . . . . . . . . . . . . . . . . . 2

Chapter 79

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 05/6. . . . . . . . . . . . . . . . . . . . . . . 0

7 10 . . . . . . . . . . . . . . . . . . . . 0

VOLUME 10

Cover . . . . . . . . . . . . . . . . . . . . 0

Title. . . . . . . . . . . . . . . . . . . . . . 0

PN. . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 95

1 18 . . . . . . . . . . . . . . . . . . . . 0

19/20. . . . . . . . . . . . . . . . . . . . . 021 38 . . . . . . . . . . . . . . . . . . . 0

39/40. . . . . . . . . . . . . . . . . . . . . 0

Chapter 96

1 20 . . . . . . . . . . . . . . . . . . . . 0

21/22. . . . . . . . . . . . . . . . . . . . . 0

23 50 . . . . . . . . . . . . . . . . . . . 0

51/52. . . . . . . . . . . . . . . . . . . . . 0

53 66 . . . . . . . . . . . . . . . . . . . 0

67/68. . . . . . . . . . . . . . . . . . . . . 0

69 78 . . . . . . . . . . . . . . . . . . . 0

79/80. . . . . . . . . . . . . . . . . . . . . 0

81/82. . . . . . . . . . . . . . . . . . . . . 0

83 98 . . . . . . . . . . . . . . . . . . . 0

VOLUME 11

Cover . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . . 0

PN. . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 97

1 8 . . . . . . . . . . . . . . . . . . . . . 0

9/10 . . . . . . . . . . . . . . . . . . . . . . 0

11/12 . . . . . . . . . . . . . . . . . . . . . 0

13/14. . . . . . . . . . . . . . . . . . . . . 015/16. . . . . . . . . . . . . . . . . . . . . 0

17/18. . . . . . . . . . . . . . . . . . . . . 0

19 32 . . . . . . . . . . . . . . . . . . . 0

33/34. . . . . . . . . . . . . . . . . . . . . 0

35 64 . . . . . . . . . . . . . . . . . . . 0

VOLUME 12

Cover . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . . 4

PN. . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 98

1/2 . . . . . . . . . . . . . . . . . . . . . . . 0

3 12 . . . . . . . . . . . . . . . . . . . . 0

13 14 . . . . . . . . . . . . . . . . . . . 4

14A 14B . . . . . . . . . . . . . . . . . 4

14C/14D . . . . . . . . . . . . . . . . . . 4

15 64 . . . . . . . . . . . . . . . . . . . 0

65/66. . . . . . . . . . . . . . . . . . . . . 0

31 JUL 2009 Rev. 5 C


12/108


LOG OF PAGES (CONT)

Page No. Rev No. Page No. Rev No. Page No. Rev No.

VOLUME 13

Cover . . . . . . . . . . . . . . . . . . . . 0

Title . . . . . . . . . . . . . . . . . . . . . . 0PN. . . . . . . . . . . . . . . . . . . . . . . 0

Chapter 99

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

MMS-01

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 6 . . . . . . . . . . . . . . . . . . . . . 0

MMS-02

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 12 . . . . . . . . . . . . . . . . . . . . 0

MMS-03

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 6 . . . . . . . . . . . . . . . . . . . . . 0

MMS-04

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 6 . . . . . . . . . . . . . . . . . . . . . 0

MMS-05

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 4 . . . . . . . . . . . . . . . . . . . . . 0

MMS-06

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 22 . . . . . . . . . . . . . . . . . . . . 0

23/24 . . . . . . . . . . . . . . . . . . . . . 0

MMS-07

1/2. . . . . . . . . . . . . . . . . . . . . . . 0

3 10 . . . . . . . . . . . . . . . . . . . . 0

11/12 . . . . . . . . . . . . . . . . . . . . . 0

MMS-08

1/2 . . . . . . . . . . . . . . . . . . . . . . .0

3 18. . . . . . . . . . . . . . . . . . . . .019/20 . . . . . . . . . . . . . . . . . . . . .0

MMS-09

1/2 . . . . . . . . . . . . . . . . . . . . . . .0

3 4. . . . . . . . . . . . . . . . . . . . . .0

5/6 . . . . . . . . . . . . . . . . . . . . . . .0

MMS-10

1/2 . . . . . . . . . . . . . . . . . . . . . . .0

3 24. . . . . . . . . . . . . . . . . . . . .0

D Rev. 5 31 JUL 2009


13/108

H ELP

E VALUATE

L OGISTICS

P UBLICATIONS

Have you found something wrong with this manual anerror, an inconsistency, unclear instructions, etc.? Althoughwe strive for accuracy and clarity, we may make errors onoccasion. If we do and you discover it, we would appreciateyour tell ing us about it so that we can change whatever isincorrect or unclear. Please be as specific as possible.

Your complaint or suggestion will be acknowledged and wewill tell you what we intend to do.

You may use the enclosed Customer Feedback form, asappl icable, to inform us where we have erred.

Your assistance is sincerely appreciated.


14/108


15/108

CUSTOMER FEEDBACK

RETURN VIA FAX TO PRODUCT SUPPORT ENGINEERING (450) 433-0272

Manual Title:___________________________________________________________

Manual Number (if assigned):_____________________________________________

Date of Issue: ___________________________________________________________

Date of Last Revision:___________________________________________________

Section, Chapter, Paragraph Affected:______________________________________

Your Feedback: ________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

Now Reads: ____________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

Should Read: ___________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

Your Name:_____________________________________________________________

Address: _______________________________________________________________

_______________________________________________________________________

Position:__________________________ Telephone No.:_______________________

Company:_______________________________Fax No.:_______________________

Reference No. (your initials and date):_____________________________________

(If you choose to mail this form, fold in thirds with addressexposed, tape and mail.)


16/108

TAPE HERE

TAPE HERE

From

POSTAGE

NECESSARY

PRODUCT SUPPORT ENGINEERING12,800 rue de lAvenirMirabel Qubec, Canada, J7J 1R4

FOLD ON DOTTED LINES AND TAPE


17/108

IMPORTANT

HELICOPTER SALE NOTICE

Please complete this Form and return by Mail or FAX (450-433-0272, Attention: CPDC)to Bell Helicopter Textron.This will ensure that the New Owners receive updates to

their Bell Helicopter Technical Manualsand Bulletins.

Model of Helicopter Sold or Purchased ____________________________________________

___________________________________________________________________________

Bell Serial Number____________________________________________________________

___________________________________________________________________________

Registration Number __________________________________________________________

___________________________________________________________________________

Company or Individual who purchased Helicopter____________________________________

___________________________________________________________________________

Address ____________________________________________________________________

City________________________________________________________________________

State_______________________________________________________________________

Zip Code ___________________________________________________________________

Country ____________________________________________________________________

FAX No. ___________________________ Telephone No. ___________________________


18/108

TAPE HERE

TAPE HERE

From

NO POSTAGE

NECESSARY

IF MAILED

IN THE

UNITED STATES

COMMERCIAL PUBLICATION DISTRIBUTION CENTERP.O. BOX 482FORT WORTH, TEXAS 76101-0482

FOLD ON DOTTED LINES AND TAPE

BUSINESS REPLY MAILFIRST CLASS PERMIT NO. 1744 FORT WORTH, TEXAS


19/108


31 JUL 2009 Rev. 5 Warranty

SPARE PARTS WARRANTY

ONE YEAR/1,000 HOURS PRORATED

WARRANTY AND REMEDY: Seller warrants each new helicopter part or helicopter part reconditioned by seller to be free from defecin material and workmanship under normal use and service and if installed on Bell model helicopters. Sellers sole obligation under this

warranty is limited to replacement or repair of parts which are determined to Sellers reasonable satisfaction to have been defectivewith 1,000 hours of operation or one (1) year after installation, whichever occurs first and reimbursement of reasonable freight chargesAfter 200 hours of use, there will be a prorated charge to the Purchaser for replacement parts (prorating the hours of total use againsthe then applicable part life or 2,000 hours, whichever is the lesser). Defective parts must be reported in writing to the Sellers WarrantyAdministration within 90 days of being found defective. Replacement of parts may be with either new or reconditioned parts, at Sellerselection. Warranty adjustment is contingent upon the Purchaser complying with the Warranty Remedies as described in theCommercial Warranty Information brochure and the Sellers Warranty Administration disposition instructions for defective parts. Failureto comply with all of the terms of this paragraph may, at Sellers sole option, void this warranty.

NOTE: Parts, components and assemblies of all new helicopters may have been restored or reworked due to mars, blemishes, dentsor other irregularities during the manufacturing process. Such restoration and/or rework is permitted under Sellers approvedmanufacturing and engineering processes and guidelines. The restoration and/or rework so completed does not render such itemsdefective in material or workmanship.

THIS WARRANTY IS GIVEN AND ACCEPTED IN PLACE OF (i) ALL OTHER WARRANTIES OR CONDITIONS, EXPRESS ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANT ABILITY AND

FITNESS FOR A PARTICULAR PURPOSE AND (ii) ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACTORIN TORT (DELICT), INCLUDING PRODUCT LIABILITIES BASED UPON STRICT LIABILITY, NEGLIGENCE, OR IMPLIEDWARRANTY IN LAW.

This warranty is the only warranty made by Seller. The Purchasers sole remedy for a breach of this warranty or any defect in a part isthe repair or replacement of helicopter parts and reimbursement of reasonable freight charges as provided herein. Seller excludesliability, whether as a result of a breach of contract or warranty, negligence or strict product liability, for incidental or consequentiadamages, including without limitation, damage to the helicopter or other property, costs and expenses resulting from required changesor modifications to helicopter components and assemblies, changes in retirement lives and overhaul periods, local customs fees andtaxes, and costs or expenses for commercial losses or lost profits due to loss of use or grounding of helicopters or otherwise.

Seller makes no warranty and disclaims all liability in contract or in tort (delict), including, without limitation, negligence and strict tort(delictual) liability, with respect to work performed by third parties at Purchasers request and with respect to engines, engineaccessories, batteries, radios, and avionics, except Seller assigns each manufacturers warranty to Purchaser to the extent suchmanufacturers warranty exists and is assignable.

This warranty shall not apply to any helicopter part which has been repaired or altered outside Sellers factory in any way so as, inSellers judgment, to affect its stability, safety or reliability, or which has been subject to misuse, negligence or accident, or which hasbeen installed in any aircraft which has been destroyed unless that helicopter has been rebuilt by Bell. A list of destroyed aircraft isobtainable from Bell Product Support. Repairs and alterations which use or incorporate parts and components other than genuine Belparts or parts approved by Bell for direct acquisit ion from sources other than Bell itself are not warranted by Bell, and this warranty shabe void to the extent that such repairs and alterations, in Sellers sole judgment, affect the stability, safety or reliability of the helicopteror any part thereof, or damage genuine Bell or Bell-approved parts. No person, corporation or organization, including Bell CustomeService Facilities, is authorized by Seller to assume for it any other liability in connection with the sale of its helicopters and parts.

NO STATEMENT, WHETHER WRITTEN OR ORAL, MADE BY ANY PERSON, CORPORATION OR ORGANIZATION, INCLUDINGBELL CUSTOMER SERVICE FACILITIES MAY BE TAKEN AS A WARRANTY NOR WILL IT BIND SELLER.

Seller makes no warranty and disclaims all liability with respect to components or parts damaged by, or worn due to, corrosion. Sellermakes no warranty and disclaims all liability for consumables (wear items) which are defined as items required for normal and routinemaintenance or replaced at scheduled intervals shorter than the warranty period. Consumables include but are not limited to engineand hydraulic oil, oil filters, packings and o-rings, anti-corrosion and/or sealing compounds, brush plating material, nuts, bolts, washers

screws, fluids, compounds, and standard aircraft hardware that is readily available to aircraft operators from sources other than Seller

All legal actions based upon claims or disputes pertaining to or involving this warranty including, but not limited to, Sellers denial of anclaim or portion thereof under this warranty, must be filed in the courts of general jurisdiction of Tarrant County, Texas or in the UnitedStates District Court for the Northern District of Texas, Ft. Worth Division located in Ft. Worth, Tarrant County, Texas. In the event thatPurchaser files such an action in either of the court systems identified above, and a final judgment in Sellers favor is rendered by suchcourt, then Purchaser shall indemnify Seller for all costs, expenses and attorneys fees incurred by Seller in defense of such claims. Inthe event Purchaser files such a legal action in a court other than those specified, and Seller successfully obtains dismissal of thaaction or transfer thereof to the above described court systems, then Purchaser shall indemnify Seller for all costs, expenses andattorneys fees incurred by Seller in obtaining such dismissal or transfer.

January 2007


20/108


21/108


BULLETIN RECORD

This Bulletin Record provides a current listing of applicable bulletins that have been incorporated in this manual

Subsequent applicable bulletins will be incorporated in future revisions/reissues.

ALERT SERVICE BULLETINS

ASB NUMBER SUBJECT DATE

206-09-124 Hydraul ic System or Control Boost Switch Off Check,

Change of

18 May 2009

TECHNICAL BULLETINS

TB NUMBER SUBJECT DATE

31 JUL 2009 Rev. 5 BR


22/108


TEMPORARY REVISION RECORD

This Temporary Revision Record provides a current listing of active Temporary Revisions against the manual.

Temporary Revisions, which have been canceled/incorporated, will only be maintained on the record until the next

revision is issued. If there are no Temporary Revisions shown on the record, this is confirmation that there are no

Temporary Revisions issued against the manual.

TEMP. REV. NO. TITLE DATE ISSUED DATE CANCELED

N/A Change Tail Rotor Drive Shaft Coupling

Inspection

24 JUL 1998 28 APR 2006

N/A Changes to Power and Starter Systems

Wiring Diagrams

19 OCT 1998 28 APR 2006

N/A Hydraulic Servo Actuator Component

Overhaul

P/N HR41103650-007 and

P/N HR41103750-002, -003, -007 and

-017

22 FEB 1999 28 APR 2006

TR Rev. 4 28 APR 2006

NOTE: For tracking purposes, Temporary Revisions are now being numbered (Example: TR-1).


23/108


NOTICE






MAINTENANCE MANUAL

VOLUME 4

FUEL/HYDRAULICS


24/108


25/108


NOTICE






MAINTENANCE MANUAL

VOLUME 4

FUEL/HYDRAULICS

7 JANUARY 1998


COPYRIGHT NOTICE

COPYRIGHT 2009

BELL HELICOPTER TEXTRON INC.

AND BELL HEL ICOPTER TEXTRON

CANADA LTD.

ALL RIG HTS RESERVE D

MAINTENANCE MANUAL

VOLUME 4

FUEL/HYDRAULICS


26/108


PN Rev. 5 31 JUL 2009

Additional copies of this publication may be obtained by contacting:

Commercial Publication Distribution Center


P. O. Box 482

Fort Worth, Texas 76101-0482

PROPRIETARY RIGHTS NOTICE

These data are proprietary to Bell Helicopter Textron Inc. Disclosure,

reproduction, or use of these data for any purpose other than helicopter

operation or maintenance is forbidden without prior written authorization from


DESTINATION CONTROL STATEMENT

These commodities, technology, or software were exported from the United

States in accordance with the Export Administration Regulations (EAR).

Diversion contrary to U.S. law prohibited. The data contained in this manual are

classified as ECCN EAR99.


27/108


29-00-00

31 JUL 2009 Rev. 5 Page 1ECCN EAR99

TABLE OF CONTENTS

Paragraph Chapter/Section Page

Number Title Number Number

CHAPTER 29 HYDRAULIC SYSTEM

HYDRAULIC SYSTEM

29-1 Hydraulic System........................................................................... 29-00-00 3

29-2 Troubleshooting ........................................................................ 29-00-00 3

29-3 Leakage Limits.......................................................................... 29-00-00 3

29-4 Hydraulic System Flushing................................................... 29-00-00 4

29-5 Hydraulic System Bleeding . ................................................. 29-00-00 10A

29-6 Functional Test Using Test Stand............................................. 29-00-00 12

29-7 Functional Test Using Helicopter System ................................. 29-00-00 13

29-7A Functional Test of Hydraulic System or Control Boost Switch

Off Check ............................................................................... 29-00-00 13

29-8 Hydraulic System Pressure Adjustment ............................... 29-00-00 14A29-9 Hydraulic System Components...................................................... 29-00-00 15

29-10 Hydraulic Pump and Reservoir ................................................. 29-00-00 15

29-11 Hydraulic Pump and Reservoir Removal ..................... 29-00-00 15

29-12 Hydraulic Pump and Reservoir Inspection and Repair. 29-00-00 15

29-13 Hydraulic Pump and Reservoir Installation .................. 29-00-00 15

29-14 Hydraulic Filter Assemblies ...................................................... 29-00-00 18

29-15 Hydraulic Filter Assemblies Removal ........................... 29-00-00 18

29-16 Hydraulic Filter Assemblies Inspection......................... 29-00-00 18

29-17 Hydraulic Filter Assemblies Installation........................ 29-00-00 18

29-18 Hydraulic Filter Element............................................................ 29-00-00 18

29-19 Hydraulic Filter Element Removal ................................ 29-00-00 18

29-20 Hydraulic Filter Element Inspection and Cleaning........ 29-00-00 19

29-21 Hydraulic Filter Element Installation ............................. 29-00-00 1929-22 Hydraulic Solenoid Valve .......................................................... 29-00-00 20

29-23 Hydraulic Solenoid Valve Removal .............................. 29-00-00 20

29-24 Hydraulic Solenoid Valve Inspection ............................ 29-00-00 20

29-25 Hydraulic Solenoid Valve Installation ........................... 29-00-00 22

29-26 Quick-Disconnects .................................................................... 29-00-00 23

29-27 Removal ............................................................................ 29-00-00 23

29-28 Inspection and Repair ....................................................... 29-00-00 23

29-29 Installation ......................................................................... 29-00-00 23

29-30 Hydraulic Hoses and Tube Assemblies .................................... 29-00-00 23

29-31 Removal ............................................................................ 29-00-00 23

29-32 Inspection and Cleaning ................................................... 29-00-00 23

29-33 Installation ......................................................................... 29-00-00 23

29-34 Rotor Brake System....................................................................... 29-00-00 24

29-35 Troubleshooting ........................................................................ 29-00-00 24

29-36 Servicing ................................................................................... 29-00-00 24

29-37 Bleeding .................................................................................... 29-00-00 24

29-38 Rotor Brake System Components ................................................. 29-00-00 24

29-39 Master Cylinder......................................................................... 29-00-00 24

29-40 Removal.................................................................................... 29-00-00 24

29-41 Inspection ................................................................................. 29-00-00 29

29-42 Installation................................................................................. 29-00-00 29


28/108


29-00-00

Page 2 Rev. 5 31 JUL 2009 ECCN EAR99

TABLE OF CONTENTS (CONT)

Paragraph Chapter/Section Page

Number Title Number Number

29-43 Rotor Brake Assembly . .................................................................. 29-00-00 29

29-44 Removal.................................................................................... 29-00-00 2929-45 Inspection ................................................................................. 29-00-00 31

29-46 Installation................................................................................. 29-00-00 31

29-47 Rotor Brake Disc ............................................................................ 29-00-00 31

29-48 Removal.................................................................................... 29-00-00 31

29-49 Inspection ................................................................................. 29-00-00 31

29-50 Installation................................................................................. 29-00-00 31

FIGURES

Figure Page

Number Title Number

29-1 Hydraulic System........................................... ...... ............................................... 4

29-2 Hydraulic System Schematic ............ ...... ............. ............................................... 5

29-3 Hydraulic System Troubleshooting ... ...... .................................................... ...... .. 6

29-4 Hydraulic Filter and Element....................................... ...... ...... ............................ 11

29-4A Cyclic and Collect ive Servo Actuators ........................ ...... ................... ............... 14

29-5 Hydraulic System Pressure Regulator Valve................................. ..................... 14C

29-6 Hydraulic System Components......... ...... .................................................... ...... .. 16

29-7 Hydraulic Pump and Reservoir ...................... ...... ............................................... 17

29-8 Hydraulic Solenoid Valve.................................................................................... 20A

29-9 Rotor Brake System............................................................................................ 2529-10 Rotor Brake System Troubleshooting............................................ ...... ............... 26

29-11 Rotor Brake Master Cylinder............................................................................... 27

29-12 Rotor Brake System Bleeding............................................................................. 28

29-13 Rotor Brake Assembly Removal and Installation................................................ 30

29-14 Rotor Disc Removal and Installation................................................................... 32

TABLES

Table Page

Number Title Number

29-1 Maximum Allowable Leakage for In-service Components .................................. 10

29-2 Functional Test Readings ................................................................................... 14A


29/108


29-00-00


2. Causes of Leakage Some seepage isnormally present, since static or dynamic seals are not

functionally perfect, due to such causes as:

a. A film of hydraulic fluid being retained by

metal surfaces such as piston rods, and thus carried

past seals. This film is necessary for seal lubrication.

b. Pressure and temperature variations affecting

seals.

c. Seals tending to take a permanent set after a

period of time.

3. Classification of Leakage External leakage ofhydraulic fluid can be broadly classified as excessive

or allowable.

a. Excessive Leakage: Fluid leakage such that

hydraulic reservoir level may be dangerously loweredor depleted during normal operation, or a fire hazard

may be created, or airworthiness of helicopter may be

otherwise compromised.

b. Allowable Leakage: Fluid leakage such that

quantity lost is insignificant, that will have no

detrimental effect on helicopter operation, and such

that correction does not warrant maintenance time

involved.

c. General: Leakage usually shows as a

seepage, stain, or wet area. It is possible for allowableleakage or seepage to collect in a cavity or depression

in adjacent structure over a period of time and falsely

indicate excessive leakage. Accumulation on a fla

area or a white-painted surface often appears to be

excessive, though it is actually allowable. It is also

possible to have enough components with allowable

leakage that their combined leakage should be

classified as excessive.

4. Leakage Checks Measurement of leakagerates, for classification according to Table 29-1, can be

performed as follows:

a. When hydraulic systems have remained in

static, unpressurized condition for an appreciable

period of time, leakage checks should not be

performed immediately after starting operation

Activate systems and operate components severa

times, then wipe off any leaked hydraulic fluid before

making leakage checks.

b. Where location of a component does nopermit direct observation, it is possible to measure

leakage on a flat surface, either on part of structure

below or a panel temporarily positioned for tha

purpose. Wipe surface clean and place a drop of fluid

on area, allow it to stabilize, then outline drop area

with grease pencil before wiping off fluid. Pressurize

and cycle the component to observe leakage rate

comparing wetted surface to marked one-drop area.

c. Where fluid dropping from a component can

be directly observed, pressurize and cycle the

component until a drop falls free. Continue operatingobserving time until next drop to determine leakage

rate.


30/108


29-00-00


29-4. HYDRAULIC SYSTEM FLUSHING

WARNING

DRYCLEANING SOLVENT (C-304) ISFLAMMABLE AND FUMES ARE TOXIC.

PROVIDE ADEQUATE VENTILATION. DO

NOT USE NEAR A FLAME.

CAUTION

USE OF ISOPROPYL ALCOHOL (C-385)

IS PROHIBITED ON EITHER INTERNAL

OR EXTERNAL SURFACES OF

HYDRAULIC COMPONENTS.

NOTE

Cap or plug all openings upon completion

of cleaning operation.

1. Remove and clean in drycleaning solvent (C-304)

the following components of the hydraulic system:

a. Hydraulic pump and reservoir (6, Figure 29-1).

Refer to paragraph 29-11.

b. Pressure hose (4) and return hose (5).

c. Filter bowl (7, Figure 29-4) and filter element

(8). Reinstall bowl (paragraph 29-19 and paragraph

29-21).

2. Connect ground hydraulic test stand pressure line

to pressure quick-disconnect socket (2) (paragraph

29-6).

3. Connect overboard drain hose to the return

quick-disconnect socket (3), of sufficient length to

reach a container for contaminated fluid.

4. Start test stand and adjust pressure to 600 PSI

(4137 kPa).

5. Cycle collective full up to full down until fluid from

overboard drain hose to container is clear.

6. Place collective in full down position and

accomplish the following steps:

a. Move cyclic from left aft corner to right forward

corner until fluid from overboard drain hose is clear.

Table 29-1. Maximum Allowable Leakage for In-service Components

COMPONENT FUNCTION TYPE LEAKAGE RATE

Servo Actuators

(Flight Controls)

Rod Seal D 1 drop/20 full cycles

Rod Seal S-D 1 drop/15 minutes

End Cap S 2 drops/day

Valve Input D 1 drop/5 cycles

Valve Input S-D 1 drop/5 minutes

Pump Output Shaft D 1 drop/minute

Ouput Shaft S-D 1 drop/minute

Housing (Mating Surfaces) S 2 drops/day

Fittings Flared or Flareless Fittings S None

Compression Seals S 1 drop/30 minutes

Type Symbols: D - Dynamic S - Static S-D - Static leakage through dynamic seal
http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/


31/108


29-00-00

b. Move cyclic from right aft corner to left forward

corner until fluid from overboard drain hose is clear.

7. Place collective in the full up position and repeat

step 6a and step 6b.

8. On helicopters with tail rotor servo actuatorinstalled, actuate tail rotor pedals through complete

travel until fluid from overboard drain hose is clear.

9. Disconnect hydraulic test stand and install clean

filter element (8, Figure 29-4) in filter bowl (7)

(paragraph 29-21).

10. Install pump and reservoir (1, Figure 29-6)

(paragraph 29-13).

11. Install pressure hose (4, Figure 29-1) and return

hose (5).

12. Fill reservoir (6) with hydraulic fluid (C-002) to

proper level.

13. Connect a calibrated gauge (0 to 1000 PSI) (0 to

6895 kPa) to test port of one of the cyclic servo

actuators (Chapter 67).

14. Place the hydraulic switch located on helicopter

console in the OFF position. Start engine. Operate at

flight idle RPM to bleed air from solenoid valve lines

Refer to applicable JetRanger Flight Manual.

15. Place the hydraulic switch in ON position and

observe calibrated gauge. Pressure should be 600

50 PSI (4137 345 kPa).

16. Shut down engine. If required, adjust pressure

(paragraph 29-8).

17. Remove calibrated pressure gauge and replace

port plug. Secure with lockwire. Fill reservoir with

clean hydraulic fluid (C-002) if required.

29-5. HYDRAULIC SYSTEM BLEEDING

Bleeding air from hydraulic system may be

accomplished with the use of a hydraulic test stand

(step 1) or by operation of helicopter (step 2).

1. Bleed air from hydraulic system with hydraulic

test stand as follows:

a. Connect hydraulic test stand to helicopte

(paragraph 29-6).

b. Set hydraulic test stand pressure to 600 PS

(4137 kPa) with a flow rate of 2.5 gallons per minute

(9.46 L/min).

31 JUL 2009 Rev. 5 Page 10A/10BECCN EAR99
http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/http://206ab-mm-29%2015-20b.pdf/


32/108


33/108


29-00-00

Figure 29-4. Hydraulic Filter and Element

206AB_MM_29_0004



34/108


35/108


29-00-00


29-7. FUNCTIONAL TEST USING HELICOPTER

SYSTEM

1. If a hydraulic test stand is not available, a

functional test of the hydraulic system may be

performed using transmission-driven hydraulic pump

(6, Figure 29-1). This test is less comprehensive thanthe test described in paragraph 29-6.

2. Inspect helicopter hydraulic system visually to

ensure all components and lines are attached, cotter

pins and lockwire are installed, and system appears

capable of satisfactory operation.

3. Ground run helicopter at flight idle RPM. Position

HYDRAULIC SYSTEM switch ON, and push HYDR

SYSTEM circuit breaker in.

4. Move cyclic and collective controls slowly to

allowable limits for ground operation with engine at

flight idle RPM. Check servo actuators and hoses for

binding, chafing, and hose movements which would

tend to loosen fittings.

5. Position HYDRAULIC SYSTEM switch OFF;

greater force should be required to move cyclic and

collective controls.

6. Position HYDRAULIC SYSTEM switch ON.

When engine has been operating a total of 15minutes, check hydraulic system components for leaks

(paragraph 29-3).

29-7A. HYDRAULIC SYSTEM OR CONTROL

BOOST SWITCH OFF CHECK

NOTE

The following check is to be accomplished

if an anomaly is reported by the pilot after

accomplishment of the hydraulic system or

control boost switch Off check (applicable206 Flight manual/ASB 206-09-124).

1. Ensure the electrical power and hydraulic

systems are turned off.

2. Disconnect control tubes (1, Figure 29-4A) from

each of the three hydraulic actuators (2). Protect

control tubes (1) from damage (Chapter 67).

3. Using a temperature measuring device, ensure

hydraulic actuators (2) are at minimum room

temperature of 60F (16C).

4. Center the cyclic and collective flight controls

Make sure friction is removed from both the collective

and the cyclic flight controls.

NOTE

In order to collect consistent data, it is

important to measure loads on the cyclic

and collective flight controls at the same

position during travel for both hot and cold

tests. A calibrated spring scale is required.

Record results in Table 29-2.

5. Position the spring scale at the center of the

cyclic grip. Move the cyclic from the left forward

position towards the right aft position while measuring

the force required moving the cyclic as it reaches its

center position. Record reading in Table 29-2.


cyclic grip. Move the cyclic from the right aft position

towards the left forward position while measuring the

force required moving the cyclic as it reaches its



cyclic grip. Move the cyclic from the right forward

position towards the left aft position while measuringthe force required moving the cyclic as it reaches its



cyclic grip. Move the cyclic from the left aft position

towards the right forward position while measuring the

force required moving the cyclic as it reaches its



throttle grip on the collective flight control. Move the

collective from the full down position while measuringthe force required to raise the collective as it reaches

its center position. Do not constrain the cyclic stick

from moving during this operation.


throttle grip on the collective flight control. Move the

collective from the full up position while measuring the

force required to lower the collective as it reaches its


36/108


29-00-00


center position. Do not constrain the cyclic stick from

moving during this operation.

CAUTION

DO NOT EXCEED 200F (93C) AT ANY

LOCATION ON THE ACTUATOR.

11. Using a heat gun, heat the boost actuator cylinder

end gland nuts (3) uniformly and all around the

circumference to 160 to 180F (71 to 82C). Repeat

step 5 through step 10 and record results in

Table 29-2.

12. Compare cyclic forces recorded at room

temperature prior to heating the actuators to the forces

recorded after heating both cyclic hydraulic actuators

(2).

a. If the cyclic stick force recorded with heated

hydraulic actuators (2) minus the forces recorded at

room temperature is greater than 10 pounds (4.54 kg),

then the respective cyclic boost actuator is defective

and should be replaced.

b. If the cyclic stick forces recorded with heated


room temperature is less than 10 pounds (4.54 kg),

and the force recorded at room temperature is greater

than 15 pounds (6.8 kg), the hydraulic actuator is

serviceable. Investigation should be conducted to

identify the root cause of the discrepancy. Swashplate

friction being too high is a possible cause. Contact

Product Support Engineering for further guidance.

c. If the cyclic stick forces recorded with heated


room temperature is less than 10 pounds (4.54 kg),

and the force recorded at room temperature is less

than 15 pounds (6.8 kg), then there is no defect in the

hydraulic actuator or control system and no further

maintenance action is required.

13. Compare collective forces recorded at room

temperature to the forces recorded after heating the

collective hydraulic actuator (2).

a. If the collective stick forces recorded with

heated hydraulic actuator (2) minus the forces

recorded at room temperature are greater than 25

pounds (11.34 kg), then the collective boost hydraulicactuator (2) is defective and should be replaced.

b. If the collective stick forces recorded with


recorded at room temperature is less than 25 pounds

(11.34 kg), and the force recorded at room

temperature is greater than 20 pounds (9.07 kg), the

hydraulic actuator is serviceable. Investigation should

be conducted to identify the root cause of the

discrepancy. Swashplate sleeve bearing

contamination is a possible cause. Contact Product

Support Engineering for further guidance.

c. If the collective stick forces recorded with


recorded at room temperature is less than 25 pounds

(11.34 kg), and the force recorded at room

temperature is less than 20 pounds (9.07 kg), then

there is no defect in the hydraulic actuatoror control

system, therefore no further maintenance action is

required.

Table 29-2. Functional Test Readings

FORCE

CYCLIC COLLECTIVE

TEST

Step 5

from Left

Forward

Step 6

from Right

Aft

Step 7

from Right

Forward

Step 8

from Left

Aft

Step 9

from Full

Down

Step 10

from Full

Up

Room Temperature

Actuators

Heated Actuators


37/108


29-00-00

Figure 29-4A. Cyclic and Collective Servo Actuator

206AB_MM_29_0015

HEAT APPLICATION (160 TO 180F/71 TO 82C).

DO NOT EXCEED 200F (93C) MAXIMUM.

SEE DETAILA

1

2

Control tube

Hydraulic actuator

Cylinder end gland nut

1.

2.

3.

DETAILA(TYPICAL 3 PLACES)

3

31 JUL 2009 Rev. 5 Page 14AECCN EAR99


38/108


29-00-00

Page 14B Rev. 5 31 JUL 2009 ECCN EAR99

14. Install control tube (1) on each hydraulic actuator

(2) (Chapter 67).

29-8. HYDRAULIC SYSTEM PRESSURE

ADJUSTMENT

NOTE

Check hydraulic system pressure and

adjust as required after replacement of

hydraulic pump and regulator, and/or when

it is suspected that operating pressure of

600 25 PSI (4137 172 kPa) is not being

maintained.

1. Cut lockwire and remove plug at test port of one

cyclic servo actuator and attach a calibrated hydraulic

pressure gauge to the test port. Use gauge designed

to indicate pressure up to 1000 PSI (6895 kPa).

2. Start engine and operate helicopter at 100% rotor

RPM and observe hydraulic pressure. Refer to

applicable JetRanger Flight Manual. If pressure is not

within 600 25 PSI (4137 172 kPa), adjust as follows:

3. Cut and remove lockwire on pressure regulating

valve housing (9, Figure 29-5). Remove valve housing

from pump and reservoir (1).

4. Remove and discard packings (2 and 3) from

valve housing (9) and sleeve (4).

CAUTION

DO NOT SEPARATE PISTON (6)AND

SPRING (7) FROM SLEEVE (4). DO NOT

REMOVE WASHERS (8) FROM VALVE

HOUSING (9 ) , EXCEPT FOR

ADJUSTMENT.

5. To increase pressure, addition of one washer (8)

will increase pressure approximately 30 PSI

(206.85 kPa). Removal on one washer will decrease

pressure approximately 30 PSI (206.85 kPa).

6. Install pressure baffle (5) over threaded end of

sleeve (4). Align cutaway area of the pressure baffle

with the flats on the sleeve.

NOTE

Pressure baffle (5) is required on all

pressure regulator valves.

7. Ensure required number of washers (8) are

installed inside valve housing (9) and that piston (6)

and spring (7) are correctly positioned in sleeve (4).Thread sleeve to valve housing . Tighten sleeve to

valve housing.

8. Lubricate new packings (2 and 3) with hydraulic

fluid (C-002) and install on sleeve (4) and valve

housing (9).

9. Install pressure regulator valve in pump and

reservoir (1). Tighten valve housing (9) .

10. Operate helicopter at 100% rotor RPM and check

hydraulic pressure. If required, adjust quantity ofwashers (8) and check hydraulic pressure.

11. Remove hydraulic test gauge and replace plug in

cyclic servo test port. Secure with lockwire.

12. Secure the pressure regulating valve housing (9)

to pump and reservoir (1) with lockwire.

T

T


39/108


29-00-00

31 JUL 2009 Rev. 5 Page 14C/14DECCN EAR99

Figure 29-5. Hydraulic System Pressure Regulator Valve


40/108


41/108


29-00-00


29-9. HYDRAULIC SYSTEM COMPONENTS

Hydraulic system components consist of pump and

reservoir (1, Figure 29-6), pressure regulator valve (2)

(located within pump and reservoir assembly),

solenoid valve (3), hydraulic system filter (4) with

replaceable filter element, and quick-disconnectsockets (5 and 6).

NOTE

The servo actuator assemblies are

discussed in Chapter 67.

29-10. HYDRAULIC PUMP AND RESERVOIR

The hydraulic pump and reservoir (1, Figure 29-6) is

located on the forward end of the transmission.

29-11. Hydraulic Pump and Reservoir

Removal

1. Disconnect cooling air hose (2, Figure 29-7) at

hydraulic reservoir.

2. Disconnect wiring at connector plug on

tachometer generator (10, Figure 29-6).

3. Remove hydraulic fluid from reservoir with asuction pump. Dispose of fluid.

4. Disconnect scupper drain line (7). Disconnect

pressure hose (8) and return hose (9) at

quick-disconnect sockets (5 and 6).

5. Remove three nuts (8, Figure 29-7) and three

washers (7). Remove hydraulic pump and reservoir

assembly (14) from transmission.

29-12. Hydraulic Pump and Reservoir Inspection and Repair

1. lnspect pump and reservoir assembly (14,

Figure 29-7) for evidence of cracks, corrosion, or

leakage, and security of mounting. lnspect splines of

pump driveshaft and coupling for wear. lnspect cooling

air jacket (5) for cracks and security, and cooling air

hose (2) for deterioration and security.

2. For repair and overhaul of hydraulic pump and

reservoir, refer to BHT-206A/B-SERIES-CR&O.

29-13. Hydraulic Pump and Reservoir

Installation

1. If removed, position cooling air jacket (5

Figure 29-7) on hydraulic pump and reservoir

assembly (14). Attach with screws (12), washers (7

and nuts (6). Apply a thin film of grease (C-525) to the

pump splines and mating splines of transmission oi

pump and tachometer generator.

2. Position pump and reservoir assembly (14) on

transmission gasket (15). Secure with three washers

(7) and three nuts (8). Ensure that vent (9) is open. No

line is required for this vent.

3. Attach scupper drain line (7, Figure 29-6). Instal

pressure and return hoses (8 and 9) to reservoir and

quick-disconnect sockets (5 and 6). Install supporting

hose clamps.

4. Connect tachometer generator (10) wiring.

5. Attach cooling air hose (2, Figure 29-7) to

hydraulic reservoir cooling air jacket (5).

6. Fill reservoir with hydraulic fluid (C-002) to proper

level.

NOTE

All inspection windows and sight glasses

are to be inspected for cracking, crazing,

and discoloration. If any one of these

conditions is present, the part must be

removed and replaced prior to returning

helicopter to service.

7. Check hydraulic pressure (paragraph 29-8)

During operation of helicopter for hydraulic pressure

check, observe system for leaks and ensure that rotor

tachometer generator is operating properly. After

removal of hydraulic pressure, check indicator. Check

level of hydraulic fluid and add fluid if required.
http://206ab-mm-29%2013-13b.pdf/http://206ab-mm-29%2013-13b.pdf/


42/108


29-00-00


Figure 29-6. Hydraulic System Components


43/108


29-00-00


Figure 29-7. Hydraulic Pump and Reservoir


44/108


29-00-00


29-14. HYDRAULIC FILTER ASSEMBLIES

Two configurations of filter assemblies are utilized on

the helicopters. Both utilize elements with a filtration

rating of 15 microns absolute. The unit utilized on

helicopters S/N 154 and subsequent provides a

positive indication of restricted flow through the filterelement by means of a red indicator button (3,

Figure 29-4) located on top of the filter body. The

button pops up at 70 10 PSI (480 69 kPa)

differential, and is inoperative below 35 15F (1.67

9.44C).


REMOVAL

1. Disconnect coupling half (16, Figure 29-4) from

coupling (15).

2. Disconnect tube from union (4).

3. Remove two bolts (1) with attaching nuts (6) and

washers (2) securing filter assembly to brackets

mounted on cabin roof. Remove filter assembly.

4. Remove coupling (15) and discard packing (14).

5. Remove union (4) and packing (5).

6. For removal of element (8), refer to paragraph

29-19.


INSPECTION

WARNING

USE OF ISOPROPYL ALCOHOL (C-385)

IS PROHIBITED ON EITHER INTERNALOR EXTERNAL SURFACES OF

HYDRAULIC COMPONENTS.

1. Clean filter body (13, Figure 29-4) with

drycleaning solvent (C-304). For inspection and

cleaning of element, refer to paragraph 29-20.

2. lnspect filter body for scratches, nicks, and dents.

3. lnspect threaded ports, coupling, coupling half,

and union for damaged threads and fluid leakage.

Replace damaged parts.

4. lnspect red indicator button (3) for proper

operation.


INSTALLATION

1. Lubricate new packings (5, 9, 12, and 14,

Figure 29-4) with hydraulic fluid (C-002).

2. Install new packing (14) on coupling (15) and

install in inlet port of filter body (13).

3. Install new packing (5) on union (4) and install in

outlet port of filter body (13).

4. Position filter assembly, on bracket on cabin roof.

Secure with bolts (1), washers (2), and nuts (6).

5. Attach coupling (15) to mating coupling half (16)

and secure.

6. For installation of filter element (8), refer to

paragraph 29-21.

7. Fill hydraulic reservoir (1, Figure 29-6) with

hydraulic fluid (C-002) to proper level.

8. Bleed hydraulic system (paragraph 29-5).

29-18. HYDRAULIC FILTER ELEMENT

The hydraulic filter element (8, Figure 29-4) functions

at high pressure over a wide temperature range.

Filtration rating is 15 microns absolute. When red

indicator button (3) on return line filter pops up,

inspect, clean, or replace hydraulic filter element.

29-19. HYDRAULIC FILTER ELEMENT REMOVAL

1. Cut and remove lockwire from filter bowl (7,

Figure 29-4) and filter body (13). Remove filter bowl

and filter element (8).

2. Remove and discard backup ring (11) and

packings (9 and 12).
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-


45/108


29-00-00


3. Helicopters S/N 4 through 153: Remove retainer

ring and withdraw filter element (8), from filter bowl (7).

4. Helicopters S/N 154 and subsequent: Press end

of springs on filter element (8) to disengage from

retention groove in filter bowl (7) and withdraw filter

element from filter bowl.


INSPECTION AND CLEANING

CAUTION

DO NOT USE ALCOHOL ON THE

HYDRAULIC COMPONENTS. ALCOHOL

CAN CAUSE DAMAGE TO THE

COMPONENTS.

1. Examine the filter element (8, Figure 29-4) for

damage to the filtering surfaces, and bonding of the

end caps to the filtering core and general condition.

Replace the filter element if any abnormality is found.

2. Inspect the filtering core for metal, brass, and

aluminum contamination. Replace the filter element if

contamination is found and flush the hydraulic system

(paragraph 29-4).

3. The filter element (8) can be cleaned a maximumof three times with any one of the following solutions:

Hudraulic fluid (C-002)

Safety solvent (C-319)

Turbine fuel (C-003)

Solvent (C-389)

0.5% cleaning compound (C-318) in filtered

water. Backflush with water.

NOTE

Cap or plug both ends of filter element to

prevent contaminant migration into the

element.

Do not use ultrasonic equipment.

4. Submerge and agitate vigorously by hand the

filter element (8) in one of the previous solvents.

5. Backflush the filter element (8) with the same

type of solvent used in step 4. Solvent/air mixture can

be utilized. Backflush pressure to be 10 to 15 PSIG.

6. Repeat step 1. If the filter element (8) is

undamaged, continue to step 7.

7. Dry the filter element (8) with dry filtered air at 50

to 60 PSIG.

NOTE

Lubricate preformed packing and retainer

with hydraulic fluid (C-002) before

installation.

8. Replace packing (9).

9. Verify retainer (10) on filter element (8) for

serviceability.

10. Scribe an X on the filter element (8) bottom end to

indicate the cleaning event.


INSTALLATION

NOTEAll packings must be lubricated with

hydraulic fluid (C-002) prior to installation.

1. For helicopters S/N 4 through 153:

a. Insert filter element (8, Figure 29-4) into filter

bowl (7) and secure with retainer (10).

b. Install filter bowl (7) into filter body (13) unde

backup ring (11) and packing (12).

c. Tighten filter bowl (7) and secure with

lockwire .

d. Fill pump and reservoir assembly (14

Figure 29-7) with hydraulic fluid (C-002) to prope

level.

e. Bleed hydraulic system (paragraph 29-5).

2. For helicopters S/N 154 and subsequent:

T
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-


46/108


29-00-00


a. Ensure a serviceable packing (9, Figure 29-4)

is installed in filter element (8) and is seated in groove.

b. Press ends of springs on filter element (8) and

insert element in filter bowl (7) until springs engage in

retention groove.

c. Install packing (12) and backup ring (11) in

filter body (13).

d. Thread filter bowl (7) into filter body (13) .

Secure filter bowl to filter body with lockwire.

e. Fill pump and reservoir assembly (14,

Figure 29-7) with hydraulic fluid (C-002) to proper

level.

f. Bleed hydraulic system (paragraph 29-5).

29-22. HYDRAULIC SOLENOID VALVE

The solenoid valve (21, Figure 29-8) is incorporated in

the hydraulic system for turning the system ON and

OFF. The solenoid valve is located forward of

transmission work deck area. The solenoid valve is

normally de-energized; when HYDR SYSTEM circuit

breaker is in and HYDRAULIC SYSTEM switch is

OFF, electrical power is applied to energize solenoid,

which closes the valve and removes hydraulic

pressure from the servo actuators (Figure 29-2).


REMOVAL

1. Position battery switch OFF and disconnect

external power if connected.

2. Disconnect electrical connector (51) from

solenoid valve (21, Figure 29-8).

3. Drain hydraulic fluid from reservoir. Place cloths

around solenoid valve (21) to absorb hydraulic fluid

during removal.

4. Disconnect hose assemblies (1, 13, 30, and 33)

from reducers (2, 12, 29, and 32).

5. On helicopters S/N 498 and subsequent:

a. Remove tube assemblies (34) from check

valve (36) and union (52), and hose assemblies (35)

from reducers (37).

b. Loosen nuts (45) and remove unions (43) and

attached parts as a unit from body (48). Discard

retainers (46) and packings (47).

6. Disconnect lines from elbows (6 and 19).

7. Remove lockwire from bolts (23). Remove bolts

and washers (22) from solenoid valve (21) and remove

solenoid valve assembly from helicopter.

8. Cap or plug all openings to prevent hydraulic

system contamination.

9. Remove lockwire from nut (8) and remove nut

and packing (9) from bolt (15). Discard packing.

10. Remove body (10) and packing (14) from bolt

(15). Discard packing.

11. Remove bolt (15) and packing (16) from solenoid

valve (21). Discard packing.

12. Remove elbow (19), nut (18), retainer (17), and

packing (20) from forward end of solenoid valve (21).

Discard packing.

13. Remove lockwire from nut (31) and remove nut,

packing (26), and body (27) from bolt (25). Discard

packing.

14. Remove packing (26) from bolt (25) and remove

bolt and packing (24) from solenoid valve (21). Discard

packing.


INSPECTION

1. lnspect solenoid valve (21, Figure 29-7) for

damage and leakage.

2. lnspect electrical connector for damage and

inspect electrical wiring for chafing and condition.

3. lnspect solenoid valve (21) for damaged thread

parts and corrosion.

T
http://-/?-http://206ab-mm-29%209-10.pdf/http://206ab-mm-29%209-10.pdf/http://-/?-


47/108


29-00-00

Figure 29-8. Hydraulic Solenoid Valve (Sheet 1 of 2)

31 JUL 2009 Rev. 5 Page 20A/20BECCN EAR99


48/108


49/108


29-00-00


Figure 29-8. Hydraulic Solenoid Valve (Sheet 2 of 2)

206AB_MM_29_0008b


50/108


29-00-00



INSTALLATION

NOTE

All packings must be lubricated with

hydraulic fluid (C-002) prior to installation.

1. lnstall packing (24, Figure 29-8) and bolt (25) in

solenoid valve (21).

2. lnstall packing (26) on bolt (25) and install body

(27) on bolt.

3. lnstall packing (26) and nut (31) on bolt (25) and

tighten. Secure nut (31) with lockwire.

4. lnstall packing (20), retainer (17), nut (18), and

elbow (19) in solenoid valve (21).

5. lnstall packing (16) and bolt (15) in solenoid valve

(21 ).

6. lnstall packing (14) on bolt (15) and install body

(10) on bolt (15).

7. lnstall packing (9) and nut (8) on bolt (15) and

tighten. Secure nut (8) with lockwire.

8. Position solenoid valve (21) on mounting point

forward of hydraulic pump and secure with bolts (23)

and washers (22). Secure bolts with lockwire.

NOTE

When torquing hose nuts, use a backup

wrench on hose end fitting to prevent

twisting of hose.

9. Connect hose assemblies (33, 30, 13, and 1) to

reducers (32, 29, 12, and 2). Tighten all fittings.

10. On helicopter S/N 498 and subsequent

(Figure 29-8, sheet 2), disassemble numbered parts

previously removed as one unit. Reassemble

numbered parts, using new packings and retainers.

a. lnstall unions (43) into bodies (48) with new

packings (47) and retainers (46). Tighten nuts (45).

b. Connect tube assemblies (34) to check valve

(36) and union (52), and hose assemblies (35) to

reducers (37). If plugs (49) are installed, tighten andsecure with lockwire.

11. Connect electrical connector to solenoid

valve (21).

12. Ensure that all fittings and hydraulic lines are

properly positioned.

13. Fill reservoir to proper level with hydraulic fluid

(C-002).

14. Bleed hydraulic system (paragraph 29-5).

15. Move cyclic and collective controls through full

range of travel, and ensure hoses do not bind or

chafe.


51/108


52/108


29-00-00


Figure 29-14. Rotor Disc Removal and Installation

206AB_MM_29_0014


53/108


NOTICE






MAINTENANCE MANUAL

VOLUME 8

FLIGHT CONTROLS


54/108


55/108


NOTICE





FOR MODELS 206A, 2

206AB-SERIES-MM_Rev_5_31-Jul-2009

Documents

Transcript of 206AB-SERIES-MM_Rev_5_31-Jul-2009