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No. 2607-S-85

Revision 0 2013-07-30 Page 1/1This document is available on the internet: www.eurocopter.com/techpub

SAFETY INFORMATION NOTICESUBJECT: OPTIONAL EQUIPMENT - External mounted hoist system

Distribution of SIL-2013-01 provided by the Goodrich company concerningan incident which occurred with an external mounted hoist system

ATA: 85 and 25

AFFECTEDHELICOPTERS

Model(s)

Civil Military

AS365 N3

AS565 MB

EC225 LP

EC725 AP

AS332 L2

MBB-BK117 C-2

EC135 T1, T2, T2+, P1, P2, P2+, 635 T1 , 635 T2+, 635 P2+

By way of SIN 2561-S-85, EUROCOPTER had informed you of an incident which had occurred with a Goodrich USexternal mounted hoist system. Shortly thereafter, the Goodrich ASB 44301-10-15 was also distributed via therespective EUROCOPTER Alert Service Bulletins.

In the meantime, the Goodrich winch manufacturer has conducted further investigations regarding the externalmounted hoist system and published the enclosed SIL-2013-01 on this topic informing you about the current status.

Appendix: SIL-2013-01 provided by the Goodrich company

For the attention of

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SIL-2013-01 Jul 25/13Page 1 of 2

Sensors & Integrated Systems

2727 E Imperial Highway

Brea, CA 92821

SERVICE INFORMATION LETTEREquipment/Furnishings - Overload Clutch

1. Background

Goodrich received information from an Operator reporting an issue with a rescue hoist system. According

to the information reported to Goodrich, the hoist lost the ability to hold a 252 kg load during a flight

check, causing the test load to strike the ground. The incident did not result in any injuries. Goodrich has

examined the subject hoist and has confirmed that the overload clutch failed. This overload clutch design

is used in all external hoists and some of the findings from the failure investigation have highlighted the

need to increase awareness within the hoist operator community of the clutch capability and how

operators should best respond to events that may damage the clutch.

The overload clutch was designed to protect the aircraft in the event of cable entanglement with a fixed

object and an inoperative cable cutter. The clutch can also protect the cable from an overload condition

that could exceed the cables breaking strength. The investigation determined that damage to the

overload clutch (a critical safety feature) is possible, if the hoist / aircraft is operated outside of the

approved flight envelope or if certain maintenance activities on the hoist are not performed correctly (see

paragraph 2.C, below).

2. Details

There are actions or conditions which could wear or degrade the capacity of the overload clutch. Some

limited examples are outlined below:

A. Peel out of the Cable. Partial peel out of the cable which indicates clutch slippage can be

recognized by the distinct stick/slip noise which is typically audible on an external hoist when the

cabin door is open, and can also be felt by a gloved hand on the cable. Failure to maintain vigilance

by keeping a gloved hand on the cable and awareness of the load during operation can result in a

partial peel out event without the operators awareness of the event. A partial peel out event occurs

when the cable is partially pulled out of the hoist under load without being commanded by the

operator. This may degrade the hoist overload clutch and reduce the overload clutchs capacity.

In the event of a partial peel out event, Goodrich recommends that the load be smoothly lowered to

the ground while in a hover. Do not attempt to raise the load to the aircraft.

B. Flight Maneuvers on the Rescue Hoist System. Aircraft maneuvers have the capability to amplifyhook loads that can exceed the overload clutchs capacity. Potential sources that could cause an

overload condition are shock loads induced from slack on the cable, or a sharp turning radius with

an extended cable, even at slow airspeeds, causing the peel out condition described above.

C. Improper adjustment of Stop/Homing Load Limit Switches. In the event of improperly adjusted

or failed up stop/homing load limit switches, the overload clutch may be cycled if the motor operates

with the hook in the homed position. Repetitive cycling of the overload clutch when driven by the

motor can rapidly accumulate overload clutch cycles and degrade the overload clutchs capacity.

TRANSMITTAL OF TECHNICAL DATA (EAR) These commodities,

technology or software are controlled by the U.S. Export Administration

Regulations (EAR). Diversion contrary to U.S. law is prohibited. ECCN: 9E991

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3. Actions

A. Overload Clutch Margin Validation

(1) A load check procedure, which is currently found in ASB44301-10-15, can be used to validate

the load margin of the overload clutches. This procedure will be integrated into the Goodrich

Organizational-level (O-Level) CMM as a means to validate overload clutch load margin.

Criteria for when it is necessary to perform this check will be documented in the O-level CMM.

(2) As part of the final closing actions for FAA AD2013-6-51 and EASA AD 2013-0077R1, the O-

level CMM for each affected hoist will be revised to include the load check as part of the hoists

annual maintenance inspection.

NOTE: Any hoist maintenance performed with the hoist installed on the aircraft must take

into consideration any limitations or required actions dictated by the Type Certificateor Supplemental Type Certificate holder.

B. Operate Within Approved Limits

Care must be taken to operate the hoist and aircraft within the allowable limits and perform

maintenance in accordance with published maintenance documentation.

If you have any questions regarding the operational limits of your aircraft with the hoist installed,

contact your aircraft OEM for hoists installed under the aircraft Type Certificate or Goodrich for

hoists installed under a Goodrich Supplemental Type Certificate.

If you have any questions regarding hoist maintenance, contact Goodrich:

Goodrich Hoist & Winch Product Support

2727 E. Imperial Highway

Brea, CA 92821

(714) 984-1461

4. Reference Documents

ASB44301-10-15

FAA AD2013-6-51

EASA AD 2013-0077R1

This document subject to the controls and restrictions on the first page.