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TO 1C-
TECHNICAL MANUA
FAULT ISOLATION
ORGANIZATIONAL MAINTE
AUXILIARY POWER UNIT
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TO 1C-130H-2-49FI-00-1INSERT LATEST CHANGED
LIST OF EFFECTIVE PAGESNOTE: The portion of the text affected by
outer margins of the page. Chapointing hands.
Dates of issue for original and changed pages are:
Original.......................0...........1 March 2002 Change........................Change........................1 .............1 April 2003 Change........................Change........................2 ..............1 J uly 2005 Change........................
TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 456, CONSISTING OF
Page *Change Page *Change PagNo. No. No. No. No
Title 5 2-42 1 - 2-42 6 Added 1 2-1
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INSERT LATES
LIST OF EFFECTIVE PAGES (CONT)
Page *Change Page *ChanNo. No. No. No.
2-311.................................. 02-312 Blank....................... 02-313.................................. 02-314 Blank....................... 02-315.................................. 2
2-316 Blank....................... 02-317.................................. 02-318 Blank....................... 02-319.................................. 02-320 Blank....................... 0
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TABLE OF CONTENTS
Section/Paragraph
LIST OF TABLES...................................................
LIST OF SCHEMATIC DIAGRAMS.....................
INTRODUCTION....................................................Purpose.................................................................Usefulness............................................................Safety ...................................................................Arrangement........................................................Special Instructions for Open Circuit Breakers
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LIST OF TABLES
Section Number Title
I I 2-1 Auxiliary Power Unit Malfunctions........4
I I 2-2 APU Start Fault Codes (Airplanes Pri-or to AF92-0547 and AF92-3021
Through AF92-3024 ExceptHC-130(H)N Airplanes AF88-2101Through AF90-2103 and MC-130H,AC-130U Airplanes)..............................4
I I 2-3 APU Start Fault Codes (HC-130(H)NAi l AF88 2101 Th h
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LIST OF SCHEMATIC DIAGR
Number Title
2-5 APU Door Warning Electrical Schematic Dia
2-6 APU Control Electrical Schematic Diagram.
2-6.1 APU Control Electrical Schematic Diagram (
2-6.2 APU Control E lectrical Schematic Diagram (MC-130W Airplanes)...................................
2-7 APU Door Control Electrical Schematic Diag
2-8 Landing Gear Touchdown Circuit Electrical
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INTRODUCTION
PURPOSE. This publication contains fault isolation procedurtion of the C-130 auxiliary power unit (APU).
USEFULNESS. The effectiveness of this publication shall, toparticipation in the program by operations and maintenancetion Manual. User feedback is the most important factor if tto-date. Use the AFTO Form 22 system to recommend new ation in this publication.
SAFETY. Fault isolation procedures in this publication are brief and concise. Comply with Warnings and Cautions to pAlways turn off the external power selector switch (located oany overhead panel. Refer to the maintenance manuals (J obprocedures - always bring the airplane to a safe condition be
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Ground fault Measurable ground when there should be
Hot fault Measurable voltage when there should be
LRU Line replaceable unit
MACAWS Mode Advisory Caution and Warning Syst
SHT Sheet
x Underline means lower-case pin letter
Test point designation
Temporary circuit interruption symbol
In-line disconnect view identifier
EFFECTIVITY. Time Compliance Technical Order (TCTO) informattion procedures is added to this publication at the same time the mmanuals are revised This is done in the form of a record of applica
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Section I.
GENERAL INFORMATIO
1-1. GENERAL. The C-130 auxilliary power unit fault analmethod composed of two elements: the Fault Reporting ManuManual (FIM).
NOTE
Ground maintenance crews may also use FRM
in Chapter 17 of TO 1C-130(A)H-2-00FR-00-1, 1C-130H-2-00FR-00-1, or Chapter 18 of TO 1C-1) to gain the same results as described in the
1-2. FAULT REPORTING MANUAL (FRM). Flight crews usnance personnel about malfunctions the flight crews encount
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c. Fault Code Indexes. The fault code indexes list all applicabnumerical order. Each fault code represents a peculiar malfunction which could be encountered by the flight crew. A figure and block ncode tells where to go in the fault isolation diagram to start the actassigned fault code numbers between 4900001 and 4900199 represfailures, and are subdivided as follows:
SYSTEM/FAILURE ASSIGNED FAULT
APU start malfunction 4900001-4900099, 4
APU run and shutdown malfunction 4900101-4900199, 4
Fault code numbers between 4900201 and 4900399 represent gas tufailures on earlier model airplanes and are covered in TO 1C-130E-
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(3) Fault Codes. Any number in the upper right corneblocks will not have a fault code, and a few will contain two are used to make sure troubleshooting starts at the block nuindex.
(4) Test Points. A block may contain a test point symwhen an electrical measurement is specified. A note identifithe test point is located. The test points on a schematic diagthe measurement being made. Test point number 1 is alwayschematic diagram. Test points 2 and up then generally go arotation. A single test point reference for voltage measuremreferenced to airplane ground.
(5) Circuit Interruption Symbol. A l ightning bolt withcircuit interruption symbol ( ). I ts presence means that a lbroken to gain access to an electrical measurement point. Cing the circuit under test are identified elsewhere on the pagswitch(es) apply to different blocks on a page a delta numbe
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1-4. SPECIAL TOOLS AND TEST EQUIPMENT REQUIRED FOR FA
AN typedesignation
Nomenclature or part No. Alternate
Engine analyzer (if 281069-1 Equivalentavailable)
Cable assembly 291761-1 Equivalent
Multimeter AN/PSM-37( ) Equivalent
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Section II. AUXILIARY POWER
2-1. GENERAL. The fault isolation material in this sectionauxiliary power unit (APU) malfunction. Contents of this secode indexes, preparation procedures to be performed prior diagrams (the actual troubleshooting procedures), locator illuthe fault isolation diagrams, and schematic diagrams.
2-2. MALFUNCTION INDEX. The malfunction index (table 2encountered during ground maintenance and no numeric fauFRM diagram, when no numeric fault code was provided by
crew only provided an alphanumeric fault code. Malfunctionlisted in the left column of the table. The middle column conwhile the right column identifies the preparation and fault is
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Table 2-2. APU Start Fault Codes (Airplanes Prior toand AF92-3021 Through AF92-3024 Except HC-130(H)N Airplane
AF90-2103 and MC-130H, AC-130U Airplanes) - Co
Fault code AFTO Form 781A report F
4900004 START light did not come on and ta- Perform fchometer indicator showed an increase in go to figureading when APU CONTROL switchwas placed to START.
4900005 START light did not come on and ta- Perform fchometer indicator did not show an in- go to figucrease in reading when APU CONTROLswitch was placed to START.
4900006 APU door did not open to approximately Perform f
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Table 2-3. APU Start Fault Codes (HC-130(H)N Airplanes AF88AF92-0547 Through AF92-2104 and AF92
Fault code AFTO Form 781A report
4900001 EGT indicator did not show increase in Pereading during start. go
4900002 APU did not sustain rotation when APU Peswitch was released to RUN. go
4900003 Tachometer indicator reading did not in- Pecrease when APU switch was placed to goSTART.
4900006 APU door did not open to approximately Pe35 degrees when APU switch was placed go
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Table 2-4. APU Run and Shutdown Fault Co
Fault code AFTO Form 781A report F
4900101 APU did not shut down when APU CON- Perform fTROL/APU switch was placed to STOP. go to figu
4900102 APU door did not close to 15 degree posi- Perform ftion when auxil iary touchdown relay was go to figudeenergized.
4900103 APU RPM is not stable under a load con- Perform fdition. go to figu
4900104 APU did not remain on speed under a Perform fload condition. go to figu
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Table 2-5. APU Start Fault Codes (AC-130U, MC-130
Fault code AFTO Form 781A report
4900001 EGT indicator did not show increase in Pereading during start. th
4900002 APU did not sustain rotation when APU PeCONTROL switch was released to RUN. th
4900003 START light came on but tachometer in- Pe
dicator did not show an increase in read- thing.
4900004 START light did not come on and ta- Pechometer indicator showed an increase in threading when APU CONTROL switch
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Table 2-5. APU Start Fault Codes (AC-130U, MC-130H, or MC-130
Fault code AFTO Form 781A report F
4900021 APU did not light off. Perform fthen go to
4900022 APU START light failed to extinguish by Perform f50% RPM. then go to
4900023 APU torched and/or made booming Perform fsound. then go to
4900024 APU stagnated during start. Perform fthen go to
4900025 APU overtemp acceleration to start or Perform f
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Table 2-6. APU Run and Shutdown Fault Codes (AC-130U, Continued
Fault code AFTO Form 781A report
4900110 Elapsed Time Indicator did not register Pe.1 for every 6 minutes of operation. th
4900111 APU emitted blue smoke during shut- Pedown. th
4900114 APU door failed to close when APU CON- Pe
TROL switch is placed to STOP. th
4900115 Starter did not disengage. Peth
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2-4. PREPARATION PROCEDURES.
WARNING
Improper or inadequate preparation of the airpinjury to personnel and/or damage to the airpla
The applicable preparation procedures must be performed bepreparation is referenced in the malfunction index and fault contained in a figure that illustrates step-by-step actions to btroubleshooting.
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1 4900A01, 4900B01YES
Is engine analyzer test set (5) to be TO SHT 23used for troubleshooting?
NO
2 NOTO SHT 37
Is DOOR OPEN/APU DR light (4) off?
YES
3
Is airplane HC-130(H)N airplane AF88- 6NO2101 through AF90-2103, airplanes
Is ON SPEED light (2) off?AF92-0547 through AF92-2104 or AF92-3281 and up?
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FROM SHT 1
11 4900008.1
Gain access to and disconnect plug P3978RAD from APU 1tachometer indicator (1). NO
RIs 115 VAC present on pin E of plug P3978RAD?
(S17
YES
12
1Temporarily remove electrical power. NOIs ground present on pin F of plug P3978RAD? R
(S18
YES
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FROM SHT 1
18NO
Does tachometer indicator (1)read 0?
YES
19
Place APU CONTROL/APU NOswitch (2) to RUN. TO SHT 61Did DOOR OPEN/APU DR light
(3) come on?
YES
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FROM SHT 7
34
Is airplane AF92-0547 through
YESAF92-1538, AF92-3281 and up, TO SHT 11AC-130U, HC-130(H)N, or MC-130H?
NO
35NO
Did ON SPEED light (2) come on TO SHT 163
in 35 seconds?
YES
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FROM SHT 9 OR 11
46NO
Did APU operate on speed after a TO SHT 185
few minutes of operation?
YES
47NO
Does BLEED AIR MANIFOLD TO SHT 199PRESS gage (1) read 0 PSI?
YES
48NO
Did APU stabilize on speed under TO SHT 203
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O
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FROM SHT 14.1
50.16NOPress to test ON SPEED light (1).
TO SHT 14.7Does ON SPEED light (1) comeon when pressed?
YES
50.17
50.18Start APU.Gain access to APU ON SPEED Shut down APU.
NO Nrelay (2). Is continuity present between ter-Is 28 VDC present on relay termi- minal B1 and X1?nal X1?
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FROM SHT 14.3
50.23
Is 28 VDC present on relay termi-YES
nal (3) X2?113
NO
50.24
Is 28 VDC present on relay termi-NO
nal (3) B2?32
YES
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FROM SHT 15
54.2
Disconnect electrical plugs fromcompressor discharge solenoid(2) and load control valve (1).Does continuity exist between thefollowing pins?
NO
Discharge Load ControlSolenoid Valve
A AB B
94 93 100 99
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FROM SHT 16.1
54.854.11a. Shut down APU. NO
b. Remove and inspect fuel control filter (1). ReplaceIs filter serviceable?
YES
54.954.12NO
Inspect fuel strainer filter (2) or (3).Clean a
Is filter serviceable?
YES
54.10 54 13
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FROM SHT 15
55
Is airplane HC-130(H)N airplane 56NO N
AF88-2101 through AF90-2103, Did ON SPEED light (2) go off?airplanes AF92-0547 throughAF92-2104 or AF92-3281 and up?
YES
YES
57N
Did DOOR OPEN/APU DR light(1) go off?
YES
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FROM SHT 17
61 4900112 NOTO SHT 241
Did APU door (1) close?
YES
62.1
61.1 Open DOOR WARNING LIGHTYES Ncircuit breaker on copilots lowerIs Airplane AC-130U or MC-
circuit breaker panel.130H?Did the DOOR OPEN light goout?
NOYES
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FROM SHT 17
65NO
Is APU oil consumption within lim- TO SHT 253
its?YES
66
NOGain access to APU fuel shutoffTO SHT 267
valve (3).Did the valve close?
YES
67
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FROM SHT 21
70.1
YESDid APU starter fail to rotate when APU con-TO SHT 190.1
trol switch (1) was placed to START and startlight (2) fails to come on?
NO
70.2
YESDid APU starter fail to rotate and the start lightTO SHT 276.1
come on while APU control switch was placedto START?
NO
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FROM SHT 22.1
70.8 YESTO SHT 127
Did APU RPM stagnate during start?
NO
70.9YES
Does APU overtemp on acceleration to start or TO SHT 202.3is there an overtemp indication?
NO
70.10
Did starter light (1) come on and APU starter YEScan be heard rotating but tachometer fails to TO SHT 132 1
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FROM SHT 1
71
Prepare for testing, and connectAPU analyzer in accordance withTO 1C-130H-2-49JG-00-1-1, 49- NO00-11. TO SHT 69Did APU door open to full open(approximately 35 degrees) whenAPU CONTROL/APU switch (1)was placed to RUN?
YES
72
Static check ignition (4) circuit in NOaccordance with TO 1C-130H-2- TO SHT 137
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FROM SHT 23
77
Static check compressor dis-charge solenoid valve (4) in ac- NO
cordance with TO 1C-130H-2-49JG-00-1-1, 49-00-11.Can solenoid operation be heard?
YES
78
NOTE
Position of ASR receptacle andFHR receptacle may be reversed.ASR receptacle has 6 wires andFHR receptacle has 4 wires. NO
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FROM SHT 25
85
Check cracking pressure in accor-NOdance with TO 1C-130H-2-49JG-
TO SHT 27500-1-1, 49-00-11.Did fuel control cracking pressurecheck satisfactory.
YES
86
Perform the no-load tests in ac-
cordance with TO 1C-130H-2- NO49JG-00-1-1, 49-00-11. TO SHT 277Was there APU rotation whenSTART switch (1) was placed to
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FROM SHT 27
90NO
Did READY TO LOAD light (5) TO SHT 175come on at 3684 to 3883 RPM?
YES
91NO
Did EXHAUST TEMP (1) remain TO SHT 159below 620 degrees C?
YES
92NO
Did APU stabilize at 4292 to 4388 TO SHT 203
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TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
90/455
FROM SHT 29
98
Test and adjust the air pressure 102regulator (3) in accordance with NO N
Gain access to and inspect filterTO 1C-130H-2-49JG-00-1-1, in air pressure regulator.49-00-11.
Is filter serviceable?Does regulated air pressure ad-
just within limits?
YES
YES
99
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
91/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
92/455
FROM SHT 31
108NO
Did EXHAUST TEMP (3) remain TO SHT 217between 580 and 620 degrees C?
YES
109
NODid TACH GENERATOR RPM in-TO SHT 217
dicator (4) read between 4182and 4307 RPM?
YES
110
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
93/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
94/455
FROM SHT 27
113NO
Did the FUEL HOLD RELAY light(3) come on?
YES
114NO
Did OIL pressure gage (2) read 5PSI minimum?
YES
115YES
Is there evidence of igniter plug TO SHT 141
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
95/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
96/455
FROM SHT 1
120NO
Visually inspect APU door (5). TO SHT 41Is APU door fully closed?
YES
121
YESIs airplane HC-130(H)N airplane AF88-2101TO SHT 39
through AF90-2103, airplanes AF92-0547 throughAF92-2104 or AF92-3281 and up?
NO
122125
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
97/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
98/455
FROM SHT 37
129
Temporarily remove electricalpower from airplane and gain ac-
cess to and disconnect plugP1726A (1) from systems caution/ NOadvisory panel (2).Is 28 VDC present on plug pin54?
2
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
99/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
100/455
FROM SHT 37
132 YESIs APU door (3) partially open?
NO
133NO
Pull APU fire control handle (2). TO SHT 47Did APU door close?
YES
134
a. Push in APU fire control han-dle
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
101/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
102/455
FROM SHT 41
140
Temporarily remove electricalpower and gain access to and
disconnect plug P168D/P1843A YES(3) at overhead panel disconnect.Is 28 VDC present on pin C ofreceptacle J132C/J963C (4)?
28
NO
141
a. Remove electrical power fromairplane.
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
103/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
104/455
FROM SHT 41
145
a. Remove electrical power fromairplane.
b. Gain access to and disconnectplug P168D/P1843A (2) at over-NO
head panel disconnect.Is there continuity between plugpin D and terminal 6 of APUCONTROL/APU switch (1)?
25 15
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
105/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
106/455
FROM SHT 41
148
Temporarily remove electricalpower and gain access to over-
head panel terminal board YESTB105AF/TB173A/1 TB141/2TO SHT 49
TB172A (1).Is 28 VDC present on terminal11/9/1 5/ 2 12?
38
NO
149
Temporarily remove electrical
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
107/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
108/455
FROM SHT 47
154
Gain access to APU door actuator (2) and disconnect plugP901A/1 P620AM (3). NO
Is there ground on pin 3 of the plug?14
YES
155
Is there 28 VDC on pin 2 of the plug? YES
13
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
109/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
110/455
FROM SHT 49
163
Gain access to APU door control/1 APU auto door control relay
(2). YESIs 28 VDC present on relay termi-nal B2?
19
NO
164
a. Gain access to and disconnectplug P603C/P1244C/ 1 P613AM YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
111/455
TO 1C-130H-2-49FI-00-1
FROM SHT 9
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
112/455
FROM SHT 49
170172Gain access to and disconnect
plug P603C/P1244C/ 1 P613AM RepYES
(4) from APU.ceptIs 28 VDC present on plug pin U? of plure 2
28
NO
171
Gain access to and disconnect 173plug P1068A/1 P614AM (3) at
RepAPU compartment firewall. YES
plugIs 28 VDC present on pin U of
plug
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
113/455
TO 1C-130H-2-49FI-00-1
FROM SHT 1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
114/455
FROM SHT 1
175
Temporarily remove electricalpower and gain access to termi-nals of ON SPEED light (2). NOIs there 28 VDC on terminal 2 ofON SPEED light?
2
YES
176
Temporarily remove electricalpower and gain access to BLEED
NOAIR VALVE switch (1) and discon-
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
115/455
TO 1C-130H-2-49FI-00-1
FROM SHT 55
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
116/455
FROM SHT 55
183
a. Temporarily remove electricalpower and reconnect wire to ter-minal B2 of APU on speed relay NO(5).b. Disconnect wire from terminalX1 of APU on speed relay.Did ON SPEED light (1) go out?
YES
184
Gain access to and open elapsed YEStime indicator (ETI) circuit breaker(4).
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
117/455
TO 1C-130H-2-49FI-00-1
FROM SHT 57
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
118/455
FROM SHT 57
191
Temporarily remove electricalpower and gain access to and YESdisconnect plug P603C/ 1
P613AM (4) from APU.Did ON SPEED light (1) go out?
NO
192
Temporarily remove electricalpower and gain access to and
YESdisconnect plug P1068A/ 1P614AM (6) from APU compart-ment firewall.
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
119/455
TO 1C-130H-2-49FI-00-1
FROM SHT 5
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
120/455
FROM SHT 5
196 NOTO SHT 71
Did APU door (3) open?
YES
197 4900007
Is airplane HC-130(H)N airplane AF88- YES2101 through AF90-2103, airplanes AF92- TO SHT 6503547 through AF92-2104 or AF92-3281and up?
NO
198
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
121/455
TO 1C-130H-2-49FI-00-1
FROM SHT 61
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
122/455
204
Gain access to APU door openwarning switch (1) and disconnect
NOquick disconnect J398E.Is 28 VDC present on disconnect-ed wire?
4
YES
205
a. Disconnect quick disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
123/455
TO 1C-130H-2-49FI-00-1
FROM SHT 61
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
124/455
208
Position MACAWS LAMP TST NOswitch (1) to TST position.Does APU DR light (2) come on?
YES
209
Gain access to APU door warninglight switch (5) and disconnect
NOquick disconnect J398E.
Is 28 VDC present on disconnect-ed wire?
1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
125/455
TO 1C-130H-2-49FI-00-1
FROM SHT 61, 63
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
126/455
217
Temporarily remove electricalpower from airplane and gain ac-cess to terminals of DOOR OPEN
YESlight (1).Is 28 VDC present on light termi-nal 2?
3 11
NO
217.1YES
Is airplane AC-130U or MC-130H?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
127/455
TO 1C-130H-2-49FI-00-1
FROM SHT 5 OR 23
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
128/455
222 4900006NO
Did APU door (2) open to approx-imately 15 degrees?
YES
223
Gain access to aux touchdown re-lay (1).
NOIs 28 VDC present on relay termi- TO SHT 261nal X1?
7
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
129/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
130/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
131/455
TO 1C-130H-2-49FI-00-1
FROM SHT 71
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
132/455
232
Is 28 VDC present on terminal X1 NOof aux touchdown relay (1)? TO SHT 261
7
YES
233
Is 28 VDC present on relay termi-YES
nal X2?
9
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
133/455
TO 1C-130H-2-49FI-00-1
FROM SHT 61
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
134/455
238
Replace bulb in APU DOOR YESOPEN light (1).Did the light come on?
NO
239
Is there ground on terminal 1 ofNO
APU DOOR OPEN light?
2
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
135/455
TO 1C-130H-2-49FI-00-1
FROM SHT 71
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
136/455
243
Gain access to APU door (1).YES
Is there any evidence of bindingor worn or broken actuator
mounts (2)?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
137/455
TO 1C-130H-2-49FI-00-1
FROM SHT 71
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
138/455
246
Temporarily remove electricalpower and gain access to termi-nals of APU CONTROL/APU YES
switch (1). TO SHT 83Is 28 VDC present on switch ter-minal 4?
14
NO
247
Is 28 VDC present on switch ter-YES
minal 5?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
139/455
TO 1C-130H-2-49FI-00-1
FROM SHT 79
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
140/455
253
Is 28 VDC present on terminal B3NO
of APU fire control switch (2)?
8
YES
254
Temporarily remove electricalpower and gain access to anddisconnect plug P340A/P1838A(5) at overhead panel disconnect. NOIs there continuity between plugpin M and terminal B3 of APU fire
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
141/455
TO 1C-130H-2-49FI-00-1
FROM SHT 79
260
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
142/455
260
Temporarily remove electricalpower and gain access to anddisconnect plug P168D/P1843A
(2) at overhead panel disconnect. NOIs there continuity between plugpin J and terminal 4 of APU CON-TROL/APU switch (1)?
24 14
YES
261 NOI i l MC 130E AF64 0551?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
143/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
144/455
FROM SHT 5
269 4900005NO
Is there evidence of APU starter rota- TO SHT 91
tion?
YES
270 4900004NO
Press to test APU START light (2). TO SHT 87Does light come on when pressed?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
145/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
273 1 4900021
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
146/455
273.1 4900021NO
Check oil quantity in oil tank.Is oil quantity within limits?
YES
273.2NO
Is fuel flow present TO SHT 86.7(fuel mist coming out exhaust)?
YES
273.3YES
Is ignition present TO SHT 86 5
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
147/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
148/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
149/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86.1
273.22
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
150/455
Check cracking pressure in accor-dance with TO 1C-130H-2-49JG- YES00-1-2, 49-30-20.Is cracking pressure (1) 60 ( 3)psi?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
151/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86 1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
152/455
FROM SHT 86.1
273.25 NOTO SHT 86.15
Is ignition present (ignitor popping)?
YES
273.26YES
Place APU control switch (1) to START. TO SHT 86.11Does APU fuel shutoff valve in No. 2 dry bay open?
NO
273 27
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
153/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86.7
273.33
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
154/455
Is ground present on relay pinNO
X2?
5
YES
273.34
Apply power to fuel valve controlrelay (1).
NOIs 28 VDC present on relay pinA2?
1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
155/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86.7
273.40
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
156/455
Monitor fuel cracking pressure atYES
atomizer.Is pressure reading present duringstart?
NO
273.41NO
Inspect APU fuel strainer filter (1).Is filter serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
157/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
158/455
FROM SHT 86.11 273.50
273.48a. Remove power to oil pressure
Place APU control switch (1) to sequencing switch (2).START. b. Disconnect oil pressure se-NO NIs 28 VDC present on fuel shutoff quencing switch plug (3).valve plug pin B? c. Place APU control switch to
START.97
Is 28 VDC present on plug pin C?
92YES
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
159/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86.7
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
160/455
273.57
a. Remove power to sequencingoil pressure switch.b. Connect oil pressure gage toAPU oil pressure test port (1).c. Disconnect plug from APU oilpressure sequencing switch (2). NO
CAUTIONDo not exceed APU starter dutycycle.
d. Motor APU.Does oil pressure gage read at
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
161/455
TO 1C-130H-2-49FI-00-1
FROM SHT 86.15
273.65
A l il filt t i t YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
162/455
Analyze oil filter contaminants. YESIs there evidence of engine fail-ure?
NO
273.66
a. Clean APU oil tank.b. Service oil tank.c. Replace oil filter.
NO
d. Remove power to ignition unit.e. Disconnect ignition unit plug
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
163/455
TO 1C-130H-2-49FI-00-1
FROM SHT 85
274
Replace bulb in APU DOOR YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
164/455
Replace bulb in APU DOOR YESOPEN light (1).Did the light come on?
NO
275
Temporarily remove electricalpower and gain access to termi-nals of APU START light (2). NOIs there ground on terminal 1 ofthe light?
3
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
165/455
TO 1C-130H-2-49FI-00-1
FROM SHT 5
279 4900003YES
Can APU starter (4) be heard ro- TO SHT 103
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
166/455
Can APU starter (4) be heard ro- TO SHT 103tating?
NO
282280
Is airplane HC-130(H)N airplaneNO NDid battery voltage (1) drop when AF88-2101 through AF90-2103,switch was placed to START? airplanes AF92-0547 through
AF92-2104 or AF92-3281 and up?YES
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
167/455
TO 1C-130H-2-49FI-00-1
FROM SHT 85 OR 89
285
Gain access to and disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
168/455
Gain access to and disconnectplug P901A/1 P620AM (5) fromAPU door actuator (3).Is 28 VDC present on pin 8 of NO
plug P901A/1 P620AM whenAPU CONTROL/APU switch (1) isplaced to RUN?
33
YES
286
Is there continuity between pins 7
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
169/455
TO 1C-130H-2-49FI-00-1
FROM SHT 91
294
Temporarily remove electrical
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
170/455
p ypower and gain access to anddisconnect plug P168D/P1843A(2) at overhead disconnect. YES
Is there continuity between plugpin G and terminal 2 of APUCONTROL/APU switch (1)?
27 16
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
171/455
TO 1C-130H-2-49FI-00-1
FROM SHT 89 OR 91
297
Gain access to APU starter (5).
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
172/455
( )Is 28 VDC present between terminals M and N when YESAPU CONTROL/APU switch (1) is placed to START?
52 54
NO
298
NOIs a ground present on terminal N of APU starter?TO SHT 285
54
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
173/455
TO 1C-130H-2-49FI-00-1
FROM SHT 95
304
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
174/455
Gain access to and disconnectplug P603C/P1244C/ 1 P613AM(5) from APU. YES
Is 28 VDC present on plug pin Jwhen APU CONTROL/APU switch(1) is placed to START?
57
NO
305
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
175/455
TO 1C-130H-2-49FI-00-1
FROM SHT 95
311
Is there continuity between pins Ad B f t if l it h NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
176/455
and B of centrifugal switch as- NOsembly (2)?
89 88
YES
312
Gain access to and remove auxNOstart relay (ASR) (3).
TO SHT 271Is a ground present on pin A ofreceptacle J606A/ 1 J431AM (4)?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
177/455
TO 1C-130H-2-49FI-00-1
FROM SHT 99
318
NOS t t l (2) d f l
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
178/455
Swap aux start relay (2) and fuelholding relay (FHR) (5).Does problem persist?
YES
319
a. Remove electrical power from
airplane.b Gain access to and disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
179/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
324.1 4900022
a. Remove AUX START relay(1)
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
180/455
(1).NO
b. Is continuity present betweenpins G and H of relay?
70 71
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
181/455
TO 1C-130H-2-49FI-00-1
FROM SHT 89
325
YESIs there evidence that APU is ro-TO SHT 105
tating with starter (generator and
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
182/455
tating with starter (generator andcooling fan as reference)?
NO
326
Remove APU starter and inspectclutch pawls in accordance with NOTO 1C-130H-2-49JG-00-1-2,49-40-10.Are clutch pawls serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
183/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
184/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
185/455
TO 1C-130H-2-49FI-00-1
FROM SHT 105
338
Gain access to and disconnect plugP158BA (1) from tachometer generator (2).
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
186/455
( ) g ( )Is there 25 ( 5) ohms resistance from pin NOA to B, A to case, and B to case of ta-chometer generator?
3 1
YES
339
Are the resistances from A to B, A to case,NO
and B to case the same within 1 ohm?
3 1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
187/455
TO 1C-130H-2-49FI-00-1
FROM SHT 105
342
Is a ground present on pin C ofplug P249U/P1189N/ 1 P607BM NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
188/455
(1)?
7
YES
343
Gain access to and disconnectplug P158BA/ 1 P615AM (2) fromtachometer generator (3).
NOIs there 25 ( 5) ohms resistance
from pin A to B, A to case, and B
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
189/455
TO 1C-130H-2-49FI-00-1
FROM SHT 107 OR 109
348
Remove tachometer generator inaccordance with TO 1C-130H-2- NO49JG 00 1 2 49 70 13 d
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
190/455
49JG-00-1-2, 49-70-13 and manu-ally rotate the shaft (4).Does shaft rotate freely?
YES
349
Inspect shaft for wear and round- NOed corners.Is shaft serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
191/455
TO 1C-130H-2-49FI-00-1
FROM SHT 111
356
Is there continuity between pin Eof receptacle J583B/ 1 J429AM
NO(2) and pin B of pl g P158BA/ 1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
192/455
(2) and pin B of plug P158BA/ 1
P615AM (4)?
2 1
YES
357
Gain access to and disconnectplug P1068A/1 P614AM (1) atAPU compartment firewall.
Is there continuity between pin b NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
193/455
TO 1C-130H-2-49FI-00-1
FROM SHT 113
363
a. Gain access to and disconnectplug P3959B (2) at overhead pan-el disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
194/455
el disconnect.b. Gain access to and disconnectplug P3978RAD (4) from APU ta- NO
chometer indicator.Is there continuity between pin bof plug P3959B and pin A of plugP3978RAD (4)?
10 12
YES
364
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
195/455
TO 1C-130H-2-49FI-00-1
FROM SHT 113
372
Gain access to and disconnectplug P362B/P3959B (2) at over-head panel disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
196/455
head panel disconnect.Is there continuity between pin b NOof plug P362B/P3959B and pin A
of plug P249U/P1189N/ 1
P607BM (4)?
10 11
YES
373
Is there continuity between pin a
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
197/455
TO 1C-130H-2-49FI-00-1
FROM SHT 7
378 1 YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
198/455
378.1 YESTO SHT 126.1
Is airplane AC-130U, MC-130H, or MC-130W?
NO
379 4900002
Gain access to and remove fuel holding relay (FHR) (4). NOIs 28 VDC present on pin H of receptacle J606B/ 1 J431BM TO SHT 123(5) when APU CONTROL/APU switch (1) is placed to RUN?
77
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
199/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
384.1 4900019NO
Did APU tachometer show an in TO SHT 132 1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
200/455
Did APU tachometer show an in- TO SHT 132.1crease in RPM?
YES
384.2
a. Remove power to the E3SS.b. Disconnect E3SS plug (1).c. Disconnect plug from Tachom-
NOeter Generator (2).
Is there continuity between E3SS
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
201/455
TO 1C-130H-2-49FI-00-1
FROM SHT 119
385
Is there continuity between pin Hof receptacle J606A/ 1 J431AM
NO(ASR) (6) and pin G of receptacle
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
202/455
J606B/1 J431BM (FHR) (5)?
71 76
YES
386
Gain access to and disconnectplug P593T/ 1 P622AM (1) fromcentrifugal switch assembly (2). NO
Is there continuity between pins C
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
203/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
393.1 4900020 393.2YES N
Is APU start attempted using bat- Is battery voltage 22 VDC ortery (BAT)? greater?
NO YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
204/455
NO YES
393.4N
Monitor voltage at starter motor.Is 28 VDC present?
YES
393.5
NRemove APU Starter (1)
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
205/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
206/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
207/455
TO 1C-130H-2-49FI-00-1
FROM SHT 119
394
Gain access to and disconnectplug P603C/P1244C/ 1 P631AM(4) from APU YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
208/455
(4) from APU. YESIs 28 VDC present on plug pin L
when APU CONTROL/APU switch(1) is placed to RUN?
60
NO
395
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
209/455
TO 1C-130H-2-49FI-00-1
FROM SHT 123
398
Gain access to APU on speed re-lay (2).Is 28 VDC present on relay termi- YESnal A1 when APU CONTROL/
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
210/455
nal A1 when APU CONTROL/APU switch (1) is placed to RUN?
40
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
211/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
212/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
213/455
TO 1C-130H-2-49FI-00-1
FROM SHT 126.1400 11
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
214/455
400.11400.9
Momentarily place the APU CON- a. Remove power from E3SS.TROL switch (1) to START. b. Remove plug (3) from E3SS.NO NIs 28 VDC momentarily present Is continuity present betweenon fuel hold relay (2) plug pin B? E3SS plug pin L and fuel hold re-
lay plug pin G?85
62 83
YESYES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
215/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
216/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
217/455
TO 1C-130H-2-49FI-00-1
FROM SHT 127, 22.3
406.1 4900115NO
Did START light (1) remain onabove 50% RPM?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
218/455
above 50% RPM?
YES
406.2
a. Remove power from AUX startrelay (2).
NOb. Remove AUX start relay.Does continuity exist between
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
219/455
TO 1C-130H-2-49FI-00-1
FROM SHT 127
407YES
Is there evidence of ignition? TO SHT 131(Can igniter be heard?)
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
220/455
408
Remove igniter plug (1) in accor- YESdance with TO 1C-130H-2-49JG- TO SHT 13300-1-2, 49-40-12.Is igniter plug serviceable?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
221/455
TO 1C-130H-2-49FI-00-1
FROM SHT 129
410
411Test and adjust the fuel controlNO Ycracking pressure in accordance Gain access to and inspect accel-
with TO 1C-130H-2-49JG-00-1-2, eration limiter control air line (1).49-30-20. Is there evidence of leakage?Is cracking pressure 57 to 63 psi?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
222/455
Is cracking pressure 57 to 63 psi?
YESNO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
223/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.3, 120.1414.3
414.1 4900026 NO Remove APU starter, inspect clutch pawls,Did light off occur? and drive shaft
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
224/455
Did light off occur? and drive shaft.Are clutch pawls and drive shaft serviceable?
YESYES
414.4
a. Remove APU generator.b. Gain access to and rotate APU generatorspline using wrench adapter P/N 280377-1.Does APU starter drive shaft rotate when APU
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
225/455
TO 1C-130H-2-49FI-00-1
FROM SHT 132.1
414.12
Remove tachometer generator NOand manually rotate the shaft.Does shaft rotate freely?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
226/455
414.13
Inspect shaft for wear and round- NOed corners.Is the shaft serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
227/455
TO 1C-130H-2-49FI-00-1
FROM SHT 132.1
414.21
a. Remove power from APU.b Gain access to and disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
228/455
b. Gain access to and disconnect
plug from tachometer indicator(1). NOIs there 75 ( 10) ohms resis-tance from pin A to B, A to C,and B to C of tachometer indica-tor?
11 9 7
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
229/455
TO 1C-130H-2-49FI-00-1
FROM SHT 132.5
414.29
Disconnect plug from tachometergenerator (2).Is there 25 ( 5) ohms resistance NOfrom pin A to B, A to case, and Bto case?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
230/455
11 9 7
YES
414.30
Are the resistances from A to B,A to case, and B to case the NOsame within one ohm?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
231/455
TO 1C-130H-2-49FI-00-1
FROM SHT 35 OR 129
415
Gain access to and disconnectplug P446L/1 P380FM (5) from NOignition unit (4). TO SHT 271Is a ground present on plug pin
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
232/455
A?
95
YES
416
Is 28 VDC present on plug pin BYES
when APU is motored? TO SHT 137
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
233/455
TO 1C-130H-2-49FI-00-1
FROM SHT 133
421
Gain access to and disconnectplug P593T/ 1 P622AM (1) from
NOcentrifugal switch assembly (2).Is there continuity between switchi C d E?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
234/455
pins C and E?
85 86
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
235/455
TO 1C-130H-2-49FI-00-1
FROM SHT 23 OR 133
424
WARNINGThe ignition lead must begrounded to surrounding structureto dissipate charged energy.
a Disconnect ignition lead (2)
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
236/455
a. Disconnect ignition lead (2)
NOfrom igniter plug (3) and groundcenter conductor to structure.b. Disconnect ignition lead fromignition unit (1).Is there continuity between bothends of ignition lead?
102 103
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
237/455
TO 1C-130H-2-49FI-00-1
FROM SHT 127
427
Disconnect fuel line (2) from at-YESomizer (1) and connect pressure
TO SHT 141gage to fuel line.Is there a pressure reading on thegage during start?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
238/455
NO
428
Gain access to and inspect filter NOin fuel strainer (3).Is filter serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
239/455
TO 1C-130H-2-49FI-00-1
FROM SHT 35 OR 139
433
Gain access to and disconnect plug P646J/ 1 P627BM NO(5) from fuel solenoid valve (6). TO SHT 271Is a ground present on plug pin A?
96
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
240/455
YES
434
Is 28 VDC present on plug pin B when APU isYES
motored? TO SHT 143
97
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
241/455
TO 1C-130H-2-49FI-00-1
FROM SHT 141
440
Remove electrical power from air-plane.
NOIs there continuity between pins Aand B of fuel solenoid valve (1)?
96 97
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
242/455
YES
441
Remove fuel filter in accordancewith TO 1C-130H-2-49JG-00-1-2, NO49-30-12.Is fuel filter clean and servicea-
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
243/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
244/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
245/455
TO 1C-130H-2-49FI-00-1
FROM SHT 145
453
Gain access to and disconnectplug P375RA/ 1 P619AM (1) from 4APU firewall.
RIs there continuity between pin A NO
bof plug P375RA/ 1 P619AM and
apin T of plug P603C/P1244C/ 1
(S
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
246/455
(SP613AM (2)?
7 4
YES
454
4Is there continuity between pin C
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
247/455
TO 1C-130H-2-49FI-00-1
FROM SHT 147
459
Temporarily remove electricalpower and gain access to anddisconnect plug P362B/P3959B(3) at overhead disconnect.
NOIs there continuity between plugpin c and disconnected wire from
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
248/455
terminal of EXH TEMP indicator(1)?
14 16
YES
460
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
249/455
TO 1C-130H-2-49FI-00-1
FROM SHT 149
467
Gain access to terminal boardTB512M/1 TB239AM (2).Is there continuity between termi- NOnal board terminal 1 and pin c ofreceptacle J133B/J3970B (1)?
11 14
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
250/455
11 14
YES
468
Gain access to spool resistorR40RA/1 R222AM (3).Is there continuity between spool
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
251/455
TO 1C-130H-2-49FI-00-1
FROM SHT 151
473
Is there continuity between termi-nal 1 of terminal board TB512M/
NO1 TB239AM (2) and pin C of re-
ceptacle J230RA/ 1 J428AM (3)?
11 5
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
252/455
YES
474
Is there continuity between termi-nal 2 of terminal board TB512M/
NO1 TB239AM and shields for all
four thermocouple wires?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
253/455
TO 1C-130H-2-49FI-00-1
FROM SHT 145
482
Is there an open between thewires removed from the + and terminals of the EXH TEMP indi- NOcator (1) and their respectiveshields?
15 16
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
254/455
YES
483
Is there a ground on the wireNO
shield of the wires removed fromthe + and terminals of the EXH
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
255/455
TO 1C-130H-2-49FI-00-1
FROM SHT 145
487
Gain access to and disconnectNO
wire from the + and terminal ofEXH TEMP indicator (1).Did indicator read off scale low?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
256/455
488
a. Connect removed wires to aresistance bridge and recordreading.b. Reverse connection of leads
YESto bridge resistance and recordreading.
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
257/455
TO 1C-130H-2-49FI-00-1
FROM SHT 7 OR 29
494 4900014
Gain access to and inspect con-trol air lines (1) for leaks and YESloose connections or fittings.Is there evidence of leaks orloose connections or fittings?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
258/455
495
Test and adjust fuel crackingpressure in accordance with TO1C-130H-2-49JG-00-1-1, 49-00-11 NOif using engine analyzer or TO1C-130H-2-49JG-00-1-2, 49-30-20
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
259/455
TO 1C-130H-2-49FI-00-1
FROM SHT 159
502
Remove and inspect thermostat inNO
accordance with TO 1C-130H-2-49JG-00-1-2, 49-50-13.Is thermostat serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
260/455
503
a. Shim thermostat for tempera-ture decrease in accordance withTO 1C-130H-2-49JG-00-1-1, 49-00-11 or TO 1C-130H-2-49JG-00-
YES1-2, 49-50-13, as applicable.b. Start APU in accordance with
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
261/455
TO 1C-130H-2-49FI-00-1
FROM SHT 9 OR 11 514
a. Shut down APU in accordance509 4900013
with TO 1C-130H-2-49JG-00-1-1,NO NDid tachometer indicator (1) read 49-00-02.
at least 95 percent within 35 b. Check cracking pressure inseconds? accordance with TO 1C-130H-2-
49JG-00-1-2, 49-30-20.Is cracking pressure correct?YES
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
262/455
TO SHT 175
510
YESIs airplane HC-130(H)N airplane AF88-2101TO SHT 165
through AF90-2103, airplanes AF92-0547through AF92-2104 or AF92-3281 and up?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
263/455
TO 1C-130H-2-49FI-00-1
FROM SHT 163
519
Gain access to APU on speed re-lay (1). NOIs 28 VDC present on relay termi- TO SHT 171nal X1?
43
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
264/455
YES
520
Is 28 VDC present on relay termi-YES
nal X2?
44
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
265/455
TO 1C-130H-2-49FI-00-1
FROM SHT 165
527
Gain access to terminals ofBLEED AIR VALVE switch (1). NOIs there 28 VDC on terminal with TO SHT 169wire K160B20?
9
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
266/455
YES
528
Gain access to terminals of APUON SPEED light (2). NOIs there 28 VDC on terminal 2?
2
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
267/455
TO 1C-130H-2-49FI-00-1
FROM SHT 165 OR 167
531
a. Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1,49-00-02.b. Remove electrical power fromairplane.c. Gain access to and disconnect
NOplug P168D/P1843A (2) at over-
head panel disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
268/455
head panel disconnect.Is there continuity between plugpin L and terminal of BLEED AIRVALVE/BL AIR switch (1) withwire K160B20?
22 9
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
269/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
270/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
271/455
TO 1C-130H-2-49FI-00-1
FROM SHT 171
541
a. Remove electrical power fromairplane.b. Gain access to and disconnectplug P603C/P1244C (5) fromAPU. NOIs there continuity between pin Pof receptacle J583B (4) and line
side of elapsed time indicator cir-
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
272/455
side of elapsed time indicator circuit breaker (6)?
65 87
YES
542
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
273/455
TO 1C-130H-2-49FI-00-1
FROM SHT 11, 29, OR 163
546
Inspect all APU air control lines YES(1).Are air lines loose or damaged?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
274/455
547
Adjust no load governed speed inaccordance with TO 1C-130H-2-49JG-00-1-1, 49-00-11 or TO 1C-
YES130H-2-49JG-00-1-2, 49-30-21,as applicable.Will governor adjust, resulting intachometer indication between 95
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
275/455
TO 1C-130H-2-49FI-00-1
FROM SHT 175
552
Remove and inspect thermostat inNO
accordance with TO 1C-130H-2-49JG-00-1-2, 49-50-13.Is thermostat serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
276/455
553
a. Adjust thermostat in accor-dance with TO 1C-130H-2-49JG-00-1-1, 49-00-11 or TO 1C-130H-2-49JG-00-1-2, 49-50-21, as ap-
YESplicable.b. Start APU in accordance with
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
277/455
TO 1C-130H-2-49FI-00-1
FROM SHT 9 OR 11
562560.1
YES NDid tachometer indicator (1) readIs Airplane AC-130U or MC-
greater than 104.5 percent before130H?
APU shut down?
NOYES
562.1561 4900011
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
278/455
561 4900011Test and adjust no load governedYES NDid tachometer indicator (1) readspeed in accordance with TO 1C-
greater than 110 percent before130H-2-49JG-00-1-2, 49-30-21.
APU shut down?Does problem persist?
NOYES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
279/455
TO 1C-130H-2-49FI-00-1
FROM SHT 179567
a. Gain access to and remove air565line (4) from centrifugal switch as-
Is airplane HC-130(H)N air-sembly (5).YES NOplane AF88-2101 throughb. Start APU in accordance with TO
AF90-2103, airplanes AF92-1C-130H-2-49JG-00-1-1, 49-00-01.
0547 through AF92-2104 orDid APU continue to operate after ta-
AF92-3281 and up?chometer (2) indicated 95 percentRPM?NO
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
280/455
568
566
a. Gain access to and re- a. Shut down APU in accordancemove air line (4) from with TO 1C-130H-2-49JG-00-1-1, 49-centrifugal switch assembly 00-02.(5). b. Gain access to and disconnectYES NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
281/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
282/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
283/455
TO 1C-130H-2-49FI-00-1
FROM SHT 9 OR 11
581 4900010
Attempt another start in accor- NOdance with TO 1C-130H-2-49JG- TO SHT 18700-1-1, 49-00-01.Does APU start?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
284/455
582
a. Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1, 58449-00-02. NO YAnalyze oil filter contaminants.b. Gain access to and remove
Is there evidence of engine fail-APU oil filter (1) in accordanceure?with TO 1C-130H-2-49JG-00-1-2,
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
285/455
TO 1C-130H-2-49FI-00-1
FROM SHT 185
589
a. Temporarily remove electricalpower and gain access to and re-move APU start current limiter (4).
YESb. Gain access to APU fuel shut-TO SHT 193
off valve (3).c. Place APU CONTROL/APUswitch (1) to START and release
to RUN.Did valve open?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
286/455
d a e ope
NO
590
Gain access to APU fuel valve
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
287/455
TO 1C-130H-2-49FI-00-1
FROM SHT 187
595
a. Gain access to and disconnectplug P643/P1125 (2) from APUfuel shutoff valve (3). NOb. Place APU CONTROL/APU TO SHT 191switch (1) to START and releaseto RUN.
Is 28 VDC present on plug pin A?9
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
288/455
9
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
289/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
598.1 4900017
a. Remove power to APU dooractuator (1).b. Disconnect plug (2) from APUdoor actuator. NO
Is 28 VDC present on pin 8 ofAPU door actuator plug when
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
290/455
APU door actuator plug whenAPU control switch (3) is placedto RUN?
33
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
291/455
TO 1C-130H-2-49FI-00-1
FROM SHT 189
599
Is airplane AF92-2104, or AF93- YES1036 and up, or an LC-130H air-plane?
NO
600
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
292/455
Gain access to terminal boardTB42B (1). NOIs there 28 VDC on terminal 20?
7
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
293/455
TO 1C-130H-2-49FI-00-1
FROM SHT 187
604
Gain access to APU oil tank (1) NOand inspect oil quantity.Is oil tank empty?
YES
605
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
294/455
Gain access to APU (2) and in- YESspect for oil leaks?Is there an oil leak?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
295/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
296/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
297/455
TO 1C-130H-2-49FI-00-1
FROM SHT 195
619
Temporarily remove electricalpower and gain access to termi- YESnals of APU fire control switch (2).Is 28 VDC present on switch ter-minal A3?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
298/455
620
Temporarily remove electricalpower and gain access to termi- NOnals of APU fire control switch.Is 28 VDC present on terminal A2of fire control switch?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
299/455
TO 1C-130H-2-49FI-00-1
FROM SHT 9 OR 11
624 4900009
a. Shut down APU in accordance withTO 1C-130H-2-49JG-00-1-1, 49-00-02.b. Gain access to and disconnect plug YES
P646K/3 P543EM (5) from load controlvalve (4).c. Start APU in accordance with TO1C-130H-2-49JG-00-1-1, 49-00-01.Does problem persist?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
300/455
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
301/455
TO 1C-130H-2-49FI-00-1
FROM SHT 199
630
Gain access to and disconnectplug P1068A/3 P614AM (6) atAPU firewall. NOIs 28 VDC present on pin G ofreceptacle J590A/ 3 J427AM (5)?
63
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
302/455
631
a. Temporarily remove electricalpower from airplane.b. Gain access to and disconnect
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
303/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.1
634.1 4900023NO
Check cracking pressure.Is pressure 60 ( 3) psi?
YES
634.2YESRemove burner drain valve (1).
Is the valve serviceable?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
304/455
Is the valve serviceable?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
305/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.3
634.6 4900025, 4900118NO
Test fuel cracking pressure.Is pressure 60 ( 3) psi?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
306/455
634.7
Remove and inspect fuel atomiz- NOer.Is atomizer serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
307/455
TO 1C-130H-2-49FI-00-1
FROM SHT 202.3
634.14
a. Remove power from APU.b. Disconnect plugs from load aircontrol valve (1) and compressordischarge solenoid valve (2).
c. Is continuity present betweenthe following pins:NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
308/455
Discharge Load AirSolenoid Control
Valve ValveA AB B
100 98
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
309/455
TO 1C-130H-2-49FI-00-1
FROM SHT 13 OR 29
635
Check regulated air pressure inNO
accordance with TO 1C-130H-2-49JG-00-1-2, 49-50-20.Is pressure within limits?
YES
636 4900107
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
310/455
Gain access to and inspect con-YES
trol air lines (1) for leaks, loosefittings and connections.Is there evidence of air leaks?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
311/455
TO 1C-130H-2-49FI-00-1
FROM SHT 13 OR 17
641.2641.1
YES NRemove, reseal, and reinstall tur-Is airplane AC-130U, MC-130H,
bine cavity vent.or MC-130W?
Did problem persist?
NOYES
642 4900106, 4900111
a. Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1,49 00 02
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
312/455
49-00-02.b. Gain access to and connect adirect reading pressure gauge tothe APU oil pump pressure port
N(2).c. Gain access to and connect a
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
313/455
TO 1C-130H-2-49FI-00-1
FROM SHT 13
647 4900105
NODid BLEED MANIFOLD PRES-TO SHT 209
SURE gage (1) show any in-crease in reading?
YES
648
Gain access to and inspect bleedYES
air lines
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
314/455
air lines.Are there any loose or damagedbleed air lines?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
315/455
TO 1C-130H-2-49FI-00-1
FROM SHT 13, 22.3
654.1 4900116
a. Shut down APU.YES
b. Inspect load control lines.Are there any damage or looselines?
NO
654.2
Perform bleed air manifold leak NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
316/455
Perform bleed air manifold leak NOcheck.Does system pass check?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
317/455
TO 1C-130H-2-49FI-00-1
FROM SHT 208.1
654.13
Inspect APU fuel strainer filter (1) NOor (2).Is filter serviceable?
YES
654.14Remove and inspect fuel atomiz- NOer
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
318/455
er.Is the atomizer serviceable?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
319/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
320/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
321/455
TO 1C-130H-2-49FI-00-1
FROM SHT 209
659
Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1,49-00-02.
NOIs there continuity between pins Aand B of load control valve sole-noid (1)?
98 99
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
322/455
660
Connect pressure gage and checkair pressure regulator in accor- NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
323/455
TO 1C-130H-2-49FI-00-1
FROM SHT 209
664
a. Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1, 49-00-02.b. Remove electrical power from air-plane. YESc. Gain access to and disconnectplug P603C/P1244C/ 1 P613AM (4)from APU.
Is a ground present on plug pin A?66
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
324/455
NO
665
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
325/455
TO 1C-130H-2-49FI-00-1
FROM SHT 209
669
a. Shut down APU in accordance with TO 1C-130H-2-49JG-00-1-1, 49-00-02.b. Remove electrical power from airplane.c. Gain access to and disconnect plug P603C/P1244C/3 NOP613AM (5) from APU.Is there continuity between pin B of plug P646K/ 3 P543EM(8) and pin G of receptacle J583B/ 3 J429AM (4)?
99 67
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
326/455
670
Gain access to and disconnect plug P1068A/ 3 P614AM (6)
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
327/455
TO 1C-130H-2-49FI-00-1
FROM SHT 15 OR 33
678 4900104
Inspect all APU control air linesYES
(1).Are there any loose or damagedair lines?
NO
679
Check regulated air pressure inNO
d ith TO 1C 130H 2
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
328/455
Oaccordance with TO 1C-130H-2-49JG-00-1-2, 49-50-20.Is pressure within limits?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
329/455
TO 1C-130H-2-49FI-00-1
FROM SHT 217
686
a. Gain access to fuel control (1)and adjust no-load governedspeed in accordance with TO 1C-130H-2-49JG-00-1-1, 49-00-11 orTO 1C-130H-2-49JG-00-1-2, 49-
YES30-21, as applicable, not to ex-ceed 105 percent.b. Start APU in accordance with
TO 1C-130H-2-49JG-00-1-1, 49-00-01 or 49-00-11 and applypneumatic and electrical load.Did APU remain on speed?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
330/455
p
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
331/455
TO 1C-130H-2-49FI-00-1
FROM SHT 15
689 4900103
Gain access to and inspect ple-num (1), split lines, and joints.
YESCheck for air leaks at joints andcracks in housings.Is there evidence of cracks or airleaks?
NO
690
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
332/455
Gain access to and inspect allYES
APU control air lines (2).Are there any loose or damagedlines?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
333/455
TO 1C-130H-2-49FI-00-1
FROM SHT 221
697
a. Shut down APU in accordancewith TO 1C-130H-2-49JG-00-1-1,49-00-02.
YESb. Remove and inspect combus-tion chamber liner (1) in accor-dance with TO 1C-130H-2-49JG-00-1-1, 49-20-10.Is there evidence of a hot spot?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
334/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
335/455
TO 1C-130H-2-49FI-00-1
FROM SHT 15
699.1 4900102YES
Is airplane AC-130U, MC-130H, TO SHT 226.1or MC-130W?
NO
700 4900102 NOTO SHT 227
Did APU door (1) fully close?
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
336/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
337/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
338/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
339/455
TO 1C-130H-2-49FI-00-1
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
340/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
341/455
TO 1C-130H-2-49FI-00-1
FROM SHT 226.3
701.23
a. Remove power to APU.b. Connect plug to APU door ac-tuator.
NOc. Gain access to APU doorclose control relay (1).
Is 28 VDC present on relay termi-nal A2?
22
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
342/455
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
343/455
TO 1C-130H-2-49FI-00-1
FROM SHT 226.5
701.33
Gain access to APU door closecontrol relay (1).
YESIs 28 VDC present on terminalA2?
22
NO
701.34
Is 28 VDC present on relay termi
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
344/455
Is 28 VDC present on relay termi-YES
nal A1?
21
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
345/455
TO 1C-130H-2-49FI-00-1
FROM SHT 225
702
Gain access to aux touchdown re-lay (No. 1) (2). NOIs 28 VDC present on relay termi- TO SHT 257nal C3?
6
YES
703
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
346/455
Gain access to and disconnectplug P901A/1 P620AM (4) from NOAPU door actuator (3).
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
347/455
TO 1C-130H-2-49FI-00-1
FROM SHT 227
709
Is there 28 VDC on terminal B1 ofNO
APU door control relay (2)?
20
YES
710
Remove electrical power from theairplane.
NOIs there continuity between termi-
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
348/455
Is there continuity between terminals X1 and X2 of relay?
23 24
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
349/455
TO 1C-130H-2-49FI-00-1
FROM SHT 229
719
Is there continuity between termi-nal A2 of APU door close control
NOrelay (1) and terminal B1 of APUdoor control relay (2)?
4 20
YES
720
Is there continuity between termi-
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
350/455
Is there continuity between terminal Y1 of door close control relay
NOand terminal B2 of door controlrelay?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
351/455
TO 1C-130H-2-49FI-00-1
FROM SHT 231
727
Gain access to and disconnectplug P901A (6) from APU dooractuator (5).
NOIs there continuity between plugpin 4 and terminal X1 of doorclose control relay (2)?
16 11
YES
728
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
352/455
728
Gain access to and swap APUNO
door control relay (3) and APU on
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
353/455
TO 1C-130H-2-49FI-00-1
FROM SHT 15 OR 33
733.1 4900101 YESTO SHT 236.1
Is airplane AC-130U, MC-130H, or MC-130W?
NO
734 4900101
a. Pull APU fire control handle (2). 738b. Gain access to and disconnect plug P646H/1
ReplaceNOP627AM (4) from overspeed test solenoid (3).dance w
Is there continuity between pins A and B of solenoid?50-11.
69 68
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
354/455
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
355/455
TO 1C-130H-2-49FI-00-1
FROM SHT 235
740.1
a. Pull APU fire control handle(1) to shut down APU.b. Remove power from APU.c. Gain access to and disconnect YESplug (2) from E3SS.Is there continuity between E3SSpins B and L?
67 62
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
356/455
740.2
Gain access to terminals of APU
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
357/455
TO 1C-130H-2-49FI-00-1
FROM SHT 235
741
a. Remove electrical power fromairplane.b. Gain access to and disconnectplug P603C/P1244C/ 1 P613AM(3) from APU. NOIs there continuity between pin Mof receptacle J583B/ 1 J429AM(2) and pin A of plug P646H/ 1
P627AM (1)?
64 69
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
358/455
742
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
359/455
TO 1C-130H-2-49FI-00-1
FROM SHT 237
745
Gain access to the terminals ofAPU CONTROL/APU switch (1).
NOIs there continuity between switchterminals 8 and 9?
11 12
YES
746
Gain access to and disconnectplug P168D/P1843A (2) at over
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
360/455
plug P168D/P1843A (2) at over-head panel disconnect.
NOIs there continuity between plug
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
361/455
TO 1C-130H-2-49FI-00-1
FROM SHT 19 OR 33
754YES
Pull APU fire control handle (2).Does APU door (3) close?
NO
755
a. Push in APU fire control han-dle.
NOb. Gain access to and disconnectTO SHT 245
plug P646G/1 P543BM (4) fromlow oil pressure switch (5)
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
362/455
low oil pressure switch (5).Is 28 VDC present on plug pin B?
30
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
363/455
TO 1C-130H-2-49FI-00-1
FROM SHT 241
759
Gain access to and disconnectplug P901A/1 P620AM (2) from NOAPU door actuator (1). TO SHT 247Is there 28 VDC on pin 2 of plugP901A/1 P620AM?
13
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
364/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
365/455
TO 1C-130H-2-49FI-00-1
FROM SHT 22.3 762.4
a. Push fire handle in.762.1 4900114
b. Gain access to APU controlYES NPull APU fire control handle (1). switch.Does the APU door close? Is 28 VDC present on terminal 6?
20NO
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
366/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
367/455
TO 1C-130H-2-49FI-00-1
FROM SHT 241
763
Gain access to and disconnectplug P603C/P1244C/ 1 P613AM YES(4) from APU.Is 28 VDC present on plug pin U?
28
NO
764
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
368/455
Gain access to and disconnectplug P1068A/1 P614AM (5) at
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
369/455
TO 1C-130H-2-49FI-00-1
FROM SHT 243
768Gain access to APU door controlrelay (2). NOIs there 28 VDC on terminal B2 of TO SHT 249relay?
19
YES
769
Gain access to APU door closecontrol relay (1).
NOC
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
370/455
NOIs there 28 VDC on terminal Y1 ofrelay?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
371/455
TO 1C-130H-2-49FI-00-1
FROM SHT 247
772a. Remove electrical power fromairplane.b. Gain access to and disconnectplug P1068A/1 P614AM (5) atAPU compartment firewall. NOIs there continuity between pin Vof receptacle J590A/ 1 J427AM(6) and terminal B2 of door con-trol relay (1)?
25 19
YES
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
372/455
773
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
373/455
TO 1C-130H-2-49FI-00-1
FROM SHT 17
777 4900110a. Remove electrical power from airplane.b. Gain access to negative terminal of NOelapsed time indicator (2). TO SHT 271Is a ground present on negative terminal?
80
YES
7787
Is there continuity across elapsed time indi-RNO
cator circuit breaker (1)?b
-
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374/455
181 87
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
375/455
TO 1C-130H-2-49FI-00-1
FROM SHT 21
783Inspect oil tank lines (2) and fit- YEStings.Is there evidence of leakage?
NO
784
Inspect oil tank vent tubes (1) for YESobstructions.Is there evidence of vent tube ob-struction?
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
376/455
O
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
377/455
TO 1C-130H-2-49FI-00-1
FROM SHT 21
792 4900108a. Remove electrical power fromairplane.b. Push in APU fire control han-dle (2).c. Place APU CONTROL/APU
YESswitch (1) to STOP.d. Gain access to APU fire con-trol switch terminals.Is there continuity between switchterminals B1 and B3?
7 8
NO
-
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378/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
379/455
TO 1C-130H-2-49FI-00-1
FROM SHT 227
797Is there 28 VDC between terminals X1 and X2
NOof aux touchdown relay (1)?
1 2
YES
798
Gain access to landing gear touchdown switch800(3) and disconnect applicable wire splice.
Is there 28 VDC on disconnected wire splice Gain access to and disconn(switch side)? wire from terminal 11 or 8, YES
applicable, from terminal bo
-
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380/455
applicable, from terminal boAIRPLANE SPLICE TEST PT TB173C (2).
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
381/455
TO 1C-130H-2-49FI-00-1
FROM SHT 257
805Gain access to terminal boardTB95A (2) and remove wire num-ber G118B18 from terminal 87. NOIs there 28 VDC on the removedwire?
3
YES
-
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382/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
383/455
TO 1C-130H-2-49FI-00-1
FROM SHT 69 OR 73
808
Gain access to terminal board TB95A (2).YES
Is 28 VDC present on terminal 87?
3
NO
809
Gain access to terminal board TB173C (3).Is 28 VDC present on specified terminal?
YESAirplane Term Test Point
9
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
384/455
Prior to AF78-0806 109
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
385/455
TO 1C-130H-2-49FI-00-1
FROM SHT 261
813
Is there 28 VDC on terminal 8 ofNO
terminal board TB173C (1)?
11
YES
814
Gain access to LG touchdownswitch (2) and disconnect wirefrom splice number 2. YESIs there 28 VDC on disconnectedwire (switch side)?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
386/455
8
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
387/455
TO 1C-130H-2-49FI-00-1
FROM SHT 261
820
Gain access to LG touchdownswitch (2) and disconnect wirefrom splice for switch terminal 4. YESIs 28 VDC present on switch pig-tail wire?
4
NO
821
Disconnect wire from splice forswitch terminal 5.Is there continuity between pig NO
-
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388/455
Is there continuity between pig- NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
389/455
TO 1C-130H-2-49FI-00-1
FROM SHT 21
827 4900109
Is 28 VDC present on terminal A3of APU fuel valve control relay NO(1)?
2
YES
828
Gain access to APU fuel shutoffNOvalve (3) and disconnect plug
TO SHT 269P643/P1125 (2).Is 28 VDC present on plug pin B?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
390/455
Is 28 VDC present on plug pin B?
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
391/455
TO 1C-130H-2-49FI-00-1
FROM SHT 267
833
Is airplane AF92-2104, or AF93- YES1036 and up, or an LC-130H air-plane?
NO
834
Gain access to terminal boardTB42B (1).
YESIs 28 VDC present on terminalboard terminal 19?
6
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
392/455
NO
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
393/455
TO 1C-130H-2-49FI-00-1
839FROM SHT 99,119,133,141,235, OR251
Gain access to and disconnect838 YES plug P613AM (4) from APU.
Is airplane MC-130E AF64-0551? Is a ground present on plugpin A?
66
NO
NO
TO SHT 273
840
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
394/455
-
7/29/2019 1C-130H-2-49FI-00-1_5766[1]
395/455
TO 1C-130H-2-49FI-00-1
FROM SHT 271
844
Gain access to and disconnectplug P603C/P1244C (4) from
YESAPU.Is a ground present on plug pinA?
66
NO
-
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-
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