ASB MBB‐BK117 D‐2‐85A‐002

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Valid for Version(s): D‐2.

EMERGENCY

ALERT SERVICE BULLETIN

SUBJECT: OPTIONAL EQUIPMENT ‐ External Mounted Hoist System

Unintended detachment of hoist damper unit

Revision No. Date of issue

Revision 0 2015‐02‐03

Revision 1 2015‐02‐12

Summary:

With Revision 1 of this of this Emergency Alert Service Bulletin, Airbus Helicopters Deutschland

introduces the measures required to reactivate the Goodrich hoist damper units.

Reason for last Revision:

Please replace Revision 0 of Emergency Alert Service Bulletin MBB‐BK117 D‐2‐85A‐002 with

Revision 1.

With the Revision 1 of this Emergency Alert Service Bulletin, Airbus Helicopters Deutschland

introduces a single‐piece retainer and an improved assembly sequence of the hoist damper

unit.

Compliance:

Airbus Helicopters Deutschland considers the compliance with this Alert Service Bulletin as

mandatory.
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1 PLANNING INFORMATION

1.A EFFECTIVITY

1.A.1 Helicopters/installed equipment and parts

a) MBB‐BK117 D‐2, all S/N, equipped with Goodrich external mounted hoist.

b) Goodrich hoist damper unit P/N 44307‐480, P/N 44307‐480‐1 with split retainers

42305‐286.

1.A.2 Non‐installed equipment and parts

See Section 1.A.1 b).

1.B ASSOCIATED REQUIREMENTS

Not applicable.

1.C REASON

Airbus Helicopters Deutschland (AHD) had been informed about MBB‐BK117

C‐2‐related incidents during which the cable unintentionally detached from the

Goodrich rescue hoist damper units while the unloaded unit was being lifted by

hand.

Subsequently AHD introduced as a first measure the modification of the bonding

strap unit and an improved retaining ring.

With Revision 0 of the EASB MBB‐BK117 D‐2‐85A‐002, a deactivation of the Goodrich

hoist damper units was prescribed.

Revision 1 of the EASB MBB‐BK117 D‐2‐85A‐002 introduces a single‐piece retainer,

an improved assembly sequence of the damper unit and the reactivation of the

Goodrich hoist damper units.

1.D DESCRIPTION

Replace the split retainers by the single‐piece retainer.

1.E COMPLIANCE

1.E.1 Compliance at H/C manufacturer level

Helicopters/installed equipment and parts:

The split retainers must be replaced with the single‐piece retainer i.a.w. Section

3.B.1 before delivery of a helicopter equipped with a Goodrich external mounted

hoist.

Non‐installed equipment and parts:

The split retainers must be replaced by the single‐piece retainer i.a.w. Section 3.B.1

before delivery of a Goodrich hoist with Goodrich hoist damper unit or delivery of a

Goodrich hoist damper unit.
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1.E.2 Compliance in service

Helicopters/installed equipment and parts:

The split retainers must be replaced by the single‐piece retainer i.a.w. Section 3.B.1

before next hoist operation.

Non‐installed equipment and parts:

The split retainers must be replaced by the single‐piece retainer i.a.w. Section 3.B.1

before next hoist operation.

1.F APPROVAL

Approval of this document:

The information or instructions contained in this document refer to change no. 3673.

The technical content of this document is approved under the authority of DOA No.

EASA.21J.034.

1.G MANPOWER

Not applicable.

1.H WEIGHT AND BALANCE

Not applicable.

1.I POWER CONSUMPTION

Not applicable.

1.J SOFTWARE UPGRADES/UPDATES

Not applicable.

1.K REFERENCES

Goodrich Component Maintenance Manual (CMM) 25‐00‐21‐1.

1.L OTHER AFFECTED PUBLICATIONS

Publications already updated:

Not applicable.

Publications to be updated:

This Emergency Alert Service Bulletin MBB‐BK117 D‐2‐85A‐002 supersedes the

Emergency Alert Service Bulletin MBB‐BK117 D‐2‐85A‐001 dated 2014‐12‐11.

1.M INTERCHANGEABILITY OR MIXABILITY OF PARTS

Interchangeability:

Not applicable.

Mixability:

Not applicable.
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2 MATERIAL INFORMATION

2.A MATERIAL: PRICE ‐ AVAILABILITY ‐ PROCUREMENT

Information on price and availability of required retrofit kit SB-117C2-85A-041-2C-1

will be provided by Airbus Helicopters Deutschland, Dept. Spares Order

Administration on request.

2.B LOGISTIC INFORMATION

Not applicable.

2.C MATERIAL REQUIRED PER HELICOPTER/COMPONENT

Kits or components to be ordered for one assembly:

Retrofit kit SB‐117C2‐85A‐041‐2C‐1.

No. Keyword Qty New P/N Old P/N Remark

1 Retaining ring 1 M2742630109D

or

AS3217--109

-- A

2 Single--piece retainer 1 B851M2060201 -- --

Split retainer -- 42305--286 --

Remark:

A = The retaining ring is a standard norm part and can be ordered locally.

Consumable materials to be ordered separately:

Consumable materials have to be ordered by the INTERTURBINE AVIATION

LOGISTICS company. The given CM numbers are IAW the AMM list of consumable

materials.

Website: http://www.interturbine.com

Phone: +49.41.91.809.300

AOG: +49.41.91.809.444

No. Keyword Qty. Specification ** CM Rema

rk

1 Laquer, single layer a.n.* -- 421 --

*a.n. = as needed

** Specification IAW AMM, 01-00-00, 2-1.

2.D MATERIAL TO BE RETURNED

Not applicable.
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3 ACCOMPLISHMENT INSTRUCTIONS

3.A GENERAL

Not applicable.

3.B WORK STEPS

3.B.1 Replacement of the split retainers by a single‐piece retainer

NOTE To get better access to the hoist damper unit, reel out approx. 2

meters of the hoist cable.

1. Remove the hook assembly (2, Figure 1) as follows:

NOTE The hook mount and the damper housing (1) are a serialized matched

set.

a. Remove the lock spring (3, Figure 1) from the hook assembly (2).

b. Unscrew the hook assembly (2) together with the hook and the attached

bonding strap unit and remove from the damper housing (1).

c. Pull the hook assembly (2) out of the damper housing (1).

2. Remove the shock attenuator as follows:

NOTE The attenuator housing (5, Figure 1) and the damper housing (1) are

a serialized matched set.

a. Remove the lock spring (4) from the shock attenuator assembly (10).

b. Unscrew the shock attenuator assembly (10) and remove from the damper

housing (1).

3. Remove the shock attenuator from the hoist cable as follows:

a. Remove and discard the retaining ring (9).

b. Remove the bonding probe assembly (8) .

c. Remove and discard split retainers (7).

d. Remove the seat retainer (6) and attenuator housing (5) from the hoist cable.

4. Remove the hoist cable from the rescue hoist i.a.w. CMM 25‐00‐21‐1.

5. Install single‐piece retainer as follows:

NOTE Ensure correct alignment and order of the parts i.a.w. Figure 2.

a. First, slip the single‐piece retainer (1, Figure 2) over the hoist cable, followed

by the seat retainer (2) and the shock attenuator housing (3).

b. Install the hoist cable on the rescue hoist i.a.w. CMM 25‐00‐21‐1.
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CAUTION RESPECT THE WARNINGS AND NOTES CONCERNING REELING IN

THE HOIST CABLE GIVEN IN THE CMM, 25‐00‐21‐1.

c. Carefully reel in the hoist cable until approx. 2 meters of extended cable are

left.

6. Assemble the shock attenuator as follows:

a. Use the hoist cable to pull the single‐piece retainer (1, Figure 2) and the seat

retainer (2) into the shock attenuator housing (3).

b. Insert the bonding probe assembly (8, Figure 1) into the shock attenuator

housing (5) and secure with a new retaining ring (9).

c. Visually check the retaining ring (9) for proper installation.

d. Screw the shock attenuator assembly (10) into the damper housing (1).

e. Install the lock spring (4) in the shock attenuator assembly (10).

7. Install the hook as follows:

CAUTION CAREFULLY INSERT THE BONDING STRAPS OVER THE BONDING

PROBE. MISALIGNMENT BETWEEN BONDING STRAP AND BONDING PROBE MAY

LEAD TO DAMAGE ON THE RETAINING RING.

a. Screw hook assembly (2, Figure 1) with the attached bonding strap into the

bottom of the damper housing (1). Ensure that the tips of the bonding straps

(1, Figure 3) are located over the bonding probe (2) inside the damper

housing.

8. Identify the damper housing as follows:

a. Using a permanent pen, identify the damper housing close to its P/N with

“EASB‐85A‐041 Rev 4” (see , Figure 1).

b. Protect identification with laquer, single‐layer (CM 421). Let laquer,

single‐layer dry i.a.w. manufacturer’s instruction.

3.B.2 Reactivate the Goodrich hoist (if deactivated with Revision 0 of this EASB):

1. Remove ty‐raps and push the following circuit breakers:

‐ HOIST CONT

‐ HOIST CC‐COL

‐ HOIST BOOM

‐ HOIST CC‐PED

2. Remove the placard with printed inscription “External Mounted Hoist

deactivated” previously affixed to a location within the pilot’s field of view.

3.C COMPLIANCE CONFIRMATION

Compliance with this document:

Confirm accomplishment of this Alert Service Bulletin by an entry in the historical

record of the helicopter and in the log card of the external mounted hoist.
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3.D OPERATING AND MAINTENANCE INSTRUCTIONS

Additional information for the use of the load check tool after compliance with this

Alert Service Bulletin:

NOTE The load check is described in Goodrich Alert Service Bulletin

44301‐10‐18 and Goodrich Service Information Letter SIL‐2014‐01

CAUTION FOLLOW THE INSTRUCTIONS OF ALERT SERVICE BULLETIN SECTION

3.B.1 WHEN REMOVE THE SHOCK ATTENUATOR ASSEMBLY (10, FIGURE 1): REMOVE

HOOK ASSEMBLY (2, FIGURE 1) BEFORE INSTALLING SHOCK ATTENUATOR ASSEMBLY

(10). THIS WILL MINIMIZE THE RISK OF MISALIGNMENT BETWEEN BONDING STRAP

AND BONDING PROBE.

1. Load check using the load check tool with the shock attenuator adapter

49900‐893 (Goodrich SIL‐2014‐01, Page 8):

a. There is no change in the procedure for the load check using the load check

tool.

2. Load check using the load check tool without the shock attenuator adapter

49900‐893 (see Figure 4):

a. Reel out approx. 2 meters of the hoist cable.

b. Remove the lock spring (4, Figure 1) from the shock attenuator assembly (10).

c. Unscrew the shock attenuator assembly (10) from the damper housing (1).

d. Remove retaining ring (9) and discard.

e. Remove bonding probe assembly (8).

f. Insert the ball end of the hoist cable into the load check tool i.a.w. Goodrich

SIL‐2014‐01.

g. Position the attenuator housing (3, Figure 4), the seat retainer (2) and the

single‐piece retainer (1) inside the Hook Adapter 49900‐891 (4).

h. Accomplish the load check.

i. Assemble the attenuator i.a.w. Section 3.B.1, task 6 of this Alert Service

Bulletin.

j. Install hook i.a.w. Section 3.B.1, task 7 of this Alert Service Bulletin.

4 APPENDIX

Not applicable.
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Goodrich Hoist Damper Unit

Figure 1

1 Damper housing

2 Hook assembly

3 Lock spring

4 Lock spring

5 Attenuator housing

6 Seat retainer

7 Single‐piece retainer B851M2060201

Split retainer 42305‐286

8 Bonding probe assembly

9 Retaining ring M2742630109D or AS3217‐109

10 Shock attenuator assembly

1

2

3

4

5

6

7

8

9

10

Identify with “EASB-85A-041 Rev 4”

After modification

Before modification
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Installation of the Single‐Piece retainer

Figure 2

1 Single‐piece retainer

2 Seat retainer

3 Attenuator housing

1

2

3

Marked with a serial number on the bottom side.

Upper end of the hoist

cable.
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1 Bonding strap

2 Bonding probe

3 Damper housing

Correct Assembly of Bonding Straps over Bonding Probe

Figure 3

1

3

2
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1

2

1 Single piece retainer

2 Seat retainer

3 Attenuator housing

4 Hook Adapter 49900‐891

Using of the Load Check Tool without Shock Attenuator Adapter

Figure 4

3

4

Step 1

Step 2

Step 3