ASB MBB-BK117-80-166

Revision 1, 2011-08-04 PAGE 1 of 10

Effective for version(s): All models A-1 thru C-1.

EMERGENCY

ALERT SERVICE BULLETIN

SUBJECT: OPTIONAL EQUIPMENT -- Rescue Winch

Deactivation of the cable cutter function on the operator handle

Revision number Issue date

Revision 0 2011-07-12

Revision 1 2011-08-04

Summary:

During a flight with a MBB-BK117 C-1 an unintentional release of the cable cutter occurred when the

rescue winch was operated. The reason of this release was an electrical malfunction caused by

mechanical damage to the operator handle coiled cable.

Reason for the Revision:

Please replace Revision 0 of Alert Service Bulletin MBB-BK117-80-166 with Revision 1.

Revision 1 specifies the deactivation of the cable cutter function on the operator handle. After the cable

cutter function has been deactivated, the rescue winch may be placed again in service.

Note: With Revision 0 the rescue winch was put out of service.

Compliance:

The cable cutter function on the operator handle must be deactivated before the rescue winch is placed

into service.

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1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

(a) All MBB-BK117, models A-1, A-3, A-4, B-1, B-2 and C-1 with optional equipment rescue

winch.

(b) Rescue winch 117--80403

117--804061

1.A.2. Non--installed equipment

Not applicable.

1.B. ASSOCIATED REQUIREMENTS

The pilots of the MBB-BK117 must be informed of the content of this Alert Service Bulletin

immediately after its receipt and they must be told that the procedures i.a.w. Temporary Revision

of the flight manual must be respected:

BK117 C1C TempRev 2

BK117 C1 TempRev 3

BK117 B2 S/N7203 TempRev 2

BK117 B2 TempRev 2

BK117 B1 TempRev 7

BK117 A4 TempRev 6

BK117 A3 TempRev 10

1.C. REASON

During a flight with a MBB-BK117 C-1 an unintentional release of the cable cutter occurred when

the rescue winch was operated. The reason of this release was an electrical malfunction caused

by mechanical damage to the operator handle coiled cable. This Alert Service Bulletin specifies

the deactivation of the cable cutter function on the operator handle. After the cable cutter function

has been deactivated, the rescue winch may be put again in service.

1.D. DESCRIPTION

Disconnect wires and cap and stow them. Affix placard ”INACTIVE”. Check the deactivation of

the cable cutter function on the operator handle. Inspect coiled cable.

1.E. COMPLIANCE

1.E.1. Compliance at the works

Helicopters/installed equipment:

Not applicable.

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Revision 1, 2011-08-04 PAGE 3 of 10

Non--installed equipment:

Not applicable.

1.E.2. Compliance in service

Helicopters/installed equipment:

(a) Note to the preflight check i.a.w. the flight manual:

A visual check of the operator handle (including coiled cable) for condition is specified in

the preflight check.

(b) Inspect the operator handle with coiled cable i.a.w. Section 3.B.1.(a) of this Alert Service

Bulletin before the rescue winch is placed into service.

(c) The cable cutter function on the operator handle must be deactivated i.a.w. Section 3.B.1

(b) of this Alert Service Bulletin before the rescue winch is placed into service.

(d) In future, the operator handle with coiled cable must be inspected i.a.w. Section 3.B.1.(a)

of this Alert Service Bulletin for mechanical damage every 30 days (tolerance +/-- 3 days).

(e) Revision 1 introduces a TBO of 10 years for the operator handle with coiled cable.

If the deadline for the first TBO has already been exceeded upon receipt of this Alert

Service Bulletin the operator is granted a time period of 9 months to accomplish the TBO.

Non--installed equipment:

Not applicable.

1.F. APPROVAL

Approval of this document:

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. EFFECT ON ELECTRICAL LOADS

Not applicable.

1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.

1.K. REFERENCES

MM MBB-BK 117.

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PAGE 4 of 10 Revision 1, 2011-08-04

1.L. OTHER DOCUMENTS AFFECTED

Not applicable.

1.M.INTERCHANGEABILITY OR MIXABILITY OF PARTS

Interchangeability:

Not applicable.

Mixability:

Not applicable.

2. MATERIAL INFORMATION

2.A. MATERIAL: PRICE -- AVAILABILITY -- PROCUREMENT

Information on price and availability of required retrofit kit SB-117--80A--166--2C1 will be provided

by ECD, Dept. Spares Order Administration on request.

2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.

2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT

Kits or components to be ordered for one helicopter or one assembly:

Material kit SB-117--80A--166--2C1.

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

1 Placard INACTIVE 1 L311M3500324 -- --

2.D. MATERIAL TO BE RETURNED

Not applicable.

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Revision 1, 2011-08-04 PAGE 5 of 10

3. ACCOMPLISHMENT INSTRUCTIONS

3.A. GENERAL INFORMATION

Not applicable.

3.B. OPERATIONAL PROCEDURE

3.B.1. Procedure

(a) Inspect the operator handle with coiled cable for mechanical damage:

1 Inspect operator handle for mechanical damage such as deformed or damaged

switches and a damaged housing.

2 Inspect coiled cable of the operator handle for mechanical damage such as abrasion,

cracks, cuts and other kinds of damage. If necessary, use aids such as a flashlight or

a magnifying glass.

(b) Deactivation of the cable cutter function on the operator handle:

1 Remove fairings / covers until module TB817L (see Figure 1) is accessible.

2 Disconnect wire MF12D20 from module TB817L, contact location ”L” (see Figure 1 or

Wiring Diagram, Figure 2).

3 Disconnect wire MF20E20 from module TB817L, contact location”F” (see Figure 1 or

Wiring Diagram, Figure 2).

4 Cap an stow wire MF12D20 and wire MF20E20. To do so, slide a heat--shrinkable

sleeve onto the wire ends and shrink on using a hot air blower. If necessary, tie capped

and stowed wires to installed wires by means of a lacing tape.

5 Reinstall removed fairings / covers.

6 Degrease the place to be bonded (see Figure 1) on the circlip of switch CABLE

CUTTER on the operator handle and affix placard ”INACTIVE” suing a transparent

adhesive silicone (e.g. CM 674).

(c) Place rescue winch into service (if it has been deactivated with Revision 0):

1 Remove ty--raps from circuit breakers CABLE CUTTER, WINCH CONT and WINCH

BOOM (see Figure 3) and press circuit breakers

or

Install the winch boom i.a.w. MM MBB BK117, Chapter 832.

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PAGE 6 of 10 Revision 1, 2011-08-04

3.B.2. Tests

(a) Check the deactivation of the cable cutter function on the operator handle.

1 Remove protective cover or plug P977 from receptacle J977 (next to the AFTER

JUNCTION BOX).

2 Connect multimeter to receptacle J977 with suitable adaption as follows: ”+” to contact

location L, ”--” to contact location H. Preselect measuring mode ”Volt” on multimeter.

3 Connect and switch on external power supply.

4 Press circuit breaker CABLE CUTTER (see Figure 3).

5 Switch WINCH OFF/ON on the overhead panel is set to position ON.

6 Press switch CABLE CUTTER on the pilot’s collective lever:

-- Measured value on multimeter: approx. 28 VDV (helicopter voltage)

7 Release switch CABLE CUTTER on the pilot’s collective lever:

-- Measured value on multimeter: approx. 0 VDC

8 If installed, accomplish steps 6 and 7 on the copilot’s collective lever.

9 Connect operator handle to receptacle J974 (on the center frame).

NOTE Accomplishment of step 10 ensures that switch ”CABLE CUTTER” on

the operator handle is out of service:

10 Press switch CABLE CUTTER on the operator handle:

-- Measured value on multimeter: approx. 0 VDC

11 Release switch CABLE CUTTER on the operator handle:

-- Measured value on multimeter: approx. 0 VDC

12 Switch off external power supply.

13 Remove multimeter from receptacle J977.

14 Install protective cover or plug P977 to receptacle J977.

3.C. IDENTIFICATION

Accomplishment of this document:

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

helicopter.

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Revision 1, 2011-08-04 PAGE 7 of 10

3.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Flight manual:

The pilots of the MBBBK117 must be informed of the content of this Alert Service Bulletin

immediately after its receipt and they must be told that the procedures i.a.w. Temporary Revision

of the flight manual must be respected.

BK117 C1C TempRev 2

BK117 C1 TempRev 3

BK117 B2 S/N7203 TempRev 2

BK117 B2 TempRev 2

BK117 B1 TempRev 7

BK117 A4 TempRev 6

BK117 A3 TempRev 10

MM/maintenance manual:

The changes will be incorporated with one of the next revisions of the maintenance manual.

4. APPENDIX

Not applicable.

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PAGE 8 of 10 Revision 1, 2011-08-04

Deactivation of the Cable Cutter Function

Figure 1

A

View A

Module TB817 L

(comprises contact locations ”L” and ”F”)

Disconnect wire MF12D20 from module TB817L, contact location ”L” and cap and stow wire

Disconnect wire MF20E20 from module TB817L, contact location ”F” and cap and stow wire

Placard L311M3500324

Operator handle

Degrease the surfaces to be bonded and affix placard using transparent adhesive

silicone.

Coiled cable

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Revision 1, 2011-08-04 PAGE 9 of 10

Wiring Diagram Deactivation of the Cable Cutter Function

Figure 2

MF20E20

MF12D20

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PAGE 10 of 10 Revision 1, 2011-08-04

Typical Installation Locations of the Circuit Breakers on the Overhead Panel

Figure 3

1 Circuit breaker

Remove ty--rap.

1

1

10

5 25

WINCH

CONT BOOM

CABLE

CUTTER

1

1 1 starting with S/N 7532

up to S/N 7531

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