# ASB **MBB-BK117-80-166**

**PAGE 1 of 10 R**  **e vision 1, 2011-08-04**  

## 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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# ASB **MBB-BK117-80-166**

**PAGE 2 of 10 R**  **e vision 1, 2011-08-04**  

## 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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# ASB **MBB-BK117-80-166**

**PAGE 3 of 10 R**  **e vision 1, 2011-08-04**  

## 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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# ASB **MBB-BK117-80-166**

**PAGE 4 of 10 R**  **e vision 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 I**  **n formation 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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# ASB **MBB-BK117-80-166**

**PAGE 5 of 10 R**  **e v**  **ision 1, 2011-08-04** 

## 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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# ASB **MBB-BK117-80-166**

**PAGE 6 of 10 R**  **e vision 1, 2011-08-04**  

## 3.B.2. T **ests (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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# ASB **MBB-BK117-80-166**

**PAGE 7 of 10 R**  **e vision 1, 2011-08-04**  

## 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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# ASB **MBB-BK117-80-166**

**PAGE 8 of 10 R**  **e vision 1, 2011-08-04**  

## Deactivation of the Cable Cutter Function

**Figure 1** 

## A

**View A Module TB817 L**  **(co mprises 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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# ASB **MBB-BK117-80-166**

**PAGE 9 of 10 R**  **e vision 1, 2011-08-04** 



## Wiring Diagram Deactivation of the Cable Cutter Function **Figure 2 MF20E20** 

**MF12D20**

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# ASB **MBB-BK117-80-166**

**PAGE 10 of 10 R**  **e vision 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**  **25 5**  **W INCH**  **C O**  **NT BOOM** 

**CABLE CUTTER** 



## 1 **1 1**  

## starting with S/N 7532

**up t o S/N 7531** 

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