## ASB MBB-BK117 C-2-52A-015

PAGE 1 of 9 Revision 0, 2011-04-26 Valid for Version(s): All. 

# ALERT SERVICE BULLETIN

**SUBJECT : DOORS AND SERVICE COVERS – Jettisonable Sliding Door**  **Inspection of Emergency Jettison System**

**Revision No. Date of issue**  Revision 0 20110426 **Summary:** During the opening of a jettisonable sliding door, the door guides of the jettison mechanism released uncommanded. With this Alert Service Bulletin an inspection for the correct installation of the jettisonable sliding doors and in particular the door guides and the release cables is prescribed. **Compliance:** Compliance with this Alert Service Bulletin is prescribed. See Section 1.E.1 and 1.E.2.

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## ASB MBB-BK117 C-2-52A-015

PAGE 2 of 9 Revision 0, 2011-04-26 

### 1. PLANNING INFORMATION **1.A. EFFECTIVITY 1.A.1. Helicopters/installed equipment**  MBB-BK117 C-2, all models, equipped with jettisonable sliding doors. **1.A.2. Non-installed equipment** Not applicable. **1.B. ASSOCIATED REQUIREMENTS 1.C. REASON**  During the opening of a jettisonable sliding door, the door guides of the jettison mechanism released uncommanded. With this Alert Service Bulletin an inspection for the correct installation of the jettisonable sliding doors and in particular the door guides and the release cables is prescribed. **1.D. DESCRIPTION** Remove the covers from the center arms and the aft inner covers of the sliding doors. Inspect for correct installation of door guides and for integrity of the release mechanism. Install covers. **1.E. COMPLIANCE 1.E.1. Compliance at the works**  Helicopters/installed equipment: Not applicable. Non-installed equipment: Not applicable. **1.E.2. Compliance in service** Helicopters/installed equipment: (a) The correct installation of the door guides and the integrity of the release mechanism of the jettisonable sliding doors must be inspected i.a.w . Section 3 within the next 50 Fh after receipt of this Alert Service Bulletin, but after two months at the latest. (b) The correct installation of the door guides and the integrity of the release mechanism of the jettisonable sliding doors must be inspected i.a.w. Section 3 after every installation of the door guides. Non-installed equipment: The correct installation of the door guides and the integrity of the release mechanism of the jettisonable sliding doors must be inspected i.a.w. Section 3 during the installation of the jettisonable sliding doors in the helicopter at the latest.

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## ASB MBB-BK117 C-2-52A-015

PAGE 3 of 9 Revision 0, 2011-04-26 **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** Qualification Mechanic Electrician Pilot Others

Time for operations approx. 4 h
− − − **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** AMM MBB-BK117 C-2 **1.L. DOCUMENTS AFFECTED** The changes to AMM MBB-BK117 C-2 which are required as a result of this Alert Service Bulletin will be incorporated with the next temporary revision. **1.M.INTERCHANGEABILITY OR MIXABILITY OF PARTS** Interchangeability: Not applicable. Mixability: Not applicable.

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## ASB MBB-BK117 C-2-52A-015

PAGE 4 of 9 Revision 0, 2011-04-26 

### 2. MATERIAL INFORMATION **2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT** Not applicable. **2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT** Not applicable. **2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT** Not applicable. Specific tooling: Test pin Manufactured i.a.w. AMM, 02-00-00, 2-5.

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## ASB MBB-BK117 C-2-52A-015

PAGE 5 of 9 Revision 0, 2011-04-26 

### 3. ACCOMPLISHMENT INSTRUCTIONS **3.A. GENERAL** Not applicable. **3.B. OPERATIONAL PROCEDURE NOTE**  The inspections requires a flashlight and a test pin (see AMM, 02-00-00, 2-5) **NOTE** The following procedure is described for the LH sliding door. The procedure for the RH sliding door is identical. **NOTE** The inspections must be accomplished with installed sliding doors.
**CAUTION MAKE SURE THAT THE RELEASE MECHANISM IS INSTALLED CORRECTLY. IF IT IS NOT**  **INSTALLED CORRECTLY, THE SLIDING DOORS CAN DISCONNECT THEMSELVES FROM THE HELICOPTER.**  **3.B.1. Inspection of the lock release assembly (Figure 1)** (a) Fully close the sliding door. (b) Remove the aft inner handle and the aft cover i.a.w. AMM, 52-12-00, 4-4. (c) Inspect the lock release assembly (Figure 1) for damage, correct installation, and especially for: – damage to the screw joints (1, Figure 1) – damage to the release cables (2, Figure 1) – prescribed clearance (approx. 1 mm) at the ends of the release cables (2, Figure 1) and movability of the cable connector (3). – locking position of the safety pin (4, Figure 1) 1 If any damage and not enough clearance and movability is found, contact ECD for further information before the next flight. 2 If no damage and enough clearance and movability is found, install the aft cover and the aft inner handle i.a.w. AMM, 52-12-00, 4-4 and proceed i.a.w. Section 3.B.2.

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## ASB MBB-BK117 C-2-52A-015

PAGE 6 of 9 Revision 0, 2011-04-26 **3.B.2. Inspection of the locking bolt of the middle lever (Figure 2)** (a) Remove the cover (3, Figure 2) from the middle lever (2). (b) Inspect the inspection hole (1) i.a.w. Figure 2. 1 If the inspection hole (1) is visible i.a.w. Figure 2 **and** the test pin (4) can not fully penetrate through the inspection hole (1), proceed i.a.w. Section 3.B.3. 2 If the inspection hole (1) is visible i.a.w. Figure 2 and the test pin (4) can fully penetrate through the inspection hole (1), re-install **both** door guides (middle lever **and** upper lever) i.a.w. AMM, 52-12-00, 4-2 and re-inspect, i.a.w. Section 3.B.2.(b)1. 3 If the inspection hole (1, Figure 2) is partly visible or not visible, re-install **both** door guides (middle lever **and** upper lever) i.a.w. AMM, 52-12-00, 4-2 and re-inspect, i.a.w. Section 3.B.2.(b)1. 4 If after repeated installation of the door guide (middle lever) (2, Figure 2) the test pin (4) fully penetrates **or** the inspection hole (1) is not fully visible, contact ECD for further information before the next flight. **3.B.3. Inspection of the locking bolt of the upper lever (Figure 3)** (a) Inspect the inspection hole (1) i.a.w. Figure 3. 1 If the inspection hole (1) is visible i.a.w. Figure 3 **and** the test pin (3) can not fully penetrate through the inspection hole (1), proceed i.a.w. Section 3.B.4. 2 If the inspection hole (1) is visible i.a.w. Figure 3 and the test pin (3) can fully penetrate through the inspection hole (1), re-install **both** door guides (middle lever **and** upper lever) i.a.w. AMM, 52-12-00, 4-2 and re-inspect, i.a.w. Section 3.B.3.(a)1. 3 If the inspection hole (1, Figure 3) is partly visible or not visible, re-install **both** door guides (upper lever **and** middle lever) i.a.w. AMM, 52-12-00, 4-2, and re-inspect, i.a.w. Section 3.B.3.(a)1. 4 If after repeated installation of the door guide (upper lever) (2, Figure 3) the test pin (3) fully penetrates **or** the inspection hole (1) is not fully visible, contact ECD for further information before the next flight. **3.B.4. Final steps** (a) Install the cover (3, Figure 2) to the middle lever (2) and proceed i.a.w. Section 3.C. **3.C. IDENTIFICATION** Identification of this document: Confirm accomplishment of this Alert Service Bulletin by an entry in the historical record of the helicopter. **3.D. OPERATING AND MAINTENANCE INSTRUCTIONS** Flight Manual (FLM): Not applicable. Aircraft Maintenance Manual (AMM): Not applicable. 

### 4. APPENDIX Not applicable.

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## ASB MBB-BK117 C-2-52A-015

PAGE 7 of 9 Revision 0, 2011-04-26 Lock release assembly Figure 1 1 Screw joint 2 Release cable 3 Cable connector 4 Safety pin 

## A

Detail 

## A 1

1 2

2 3

Inspect for damage and correct installation Inspect for prescribed clearance (approx. 1 mm) and movability of the cable connector. 4

Inspect locking position of the safety pin.

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## ASB MBB-BK117 C-2-52A-015

PAGE 8 of 9 Revision 0, 2011-04-26 Door guide (middle lever) Figure 2 1 Inspection hole 2 Door guide (middle lever) 3 Cover 4 Test pin 1 2 

### View 

## A

Detail 

## A

3 2

Inspect if the inspection hole is visible i.a.w. Detail A. Inspect if the test pin can not fully penetrate through the inspection hole. 4 1

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## ASB MBB-BK117 C-2-52A-015

PAGE 9 of 9 Revision 0, 2011-04-26 Door guide (upper lever) Figure 3 1 Inspection hole 2 Door guide (upper lever) 3 Test pin 1 2 

### View 

## A

Detail 

## A

Inspect if the inspection hole is visible i.a.w. Detail A. 1

Inspect if the test pin can not fully penetrate through the inspection hole. 1 3

2

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