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

Revision 0, 2011-04-26 PAGE 1 of 9

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.

This document is available on the internet: www.eurocopter.com/techpub
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.

This document is available on the internet: www.eurocopter.com/techpub
ASB MBB-BK117 C-2-52A-015

Revision 0, 2011-04-26 PAGE 3 of 9

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.

This document is available on the internet: www.eurocopter.com/techpub
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.

This document is available on the internet: www.eurocopter.com/techpub
ASB MBB-BK117 C-2-52A-015

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

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.

This document is available on the internet: www.eurocopter.com/techpub
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.

This document is available on the internet: www.eurocopter.com/techpub
ASB MBB-BK117 C-2-52A-015

Revision 0, 2011-04-26 PAGE 7 of 9

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.

This document is available on the internet: www.eurocopter.com/techpub
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

This document is available on the internet: www.eurocopter.com/techpub
ASB MBB-BK117 C-2-52A-015

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

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

This document is available on the internet: www.eurocopter.com/techpub