·~~[~fopter MBB BK117 C-2 

ALERT SERVICE BULLETIN 

Fire Protection System - Fire Extinguishing System - Retrofit of 

improved clamps for the injection tubes 

1. Planning Information 

A. Effectivity 

(1) Helicopters affected: 

(2) Components affected: 

(3) Spare parts affected: 

B. Concurrent Requirements 

Not applicable. 

C. Reason 

All MBB BK117C-2, S/N 9004 up to and including 

S/N 9104, furthermore S/N 9106, 9107 and 9111 , 

equipped with fire extinguishing system B262K1 002-801, 

B262K1 003-801 and B262K1 004-801 . 

Clamp NAS1922-0100-3, 

Clamp TORRO 16-27/ 9C7W5 . 

Not applicable. 

During an inadvertent operation of the fire extinguishing system, in one case it occurred that 

one connection of two injection tubes became disconnected. For this reason, all respective 

clamps must be replaced with an improved version. 

D. Description 

Replace clamps of the injection tubes. 

E. Compliance 

This Alert Service Bulletin must be accomplished at the next 1 00 fh inspection, but by 

31 .12.2007 at the latest. 

F. Approval 

The technical content of this document is approved under the authority of 

DOA No. EASA.21 J.034 

G. Manpower 

Approx. 3,5 man- hours. 

H. Weight and Balance 

Not applicable. 

2007-01-22 MBB BK117 C-2-26A-001 

PAGE 1 of 4 
~ld[~2opter MBB BK117 C-2 

ALERT SERVICE BULLETIN 

I. Electrical Load Data 

Not applicable. 

J. Software Accomplishment Summary 

Not applicable. 

K. References 

AMM MBB BK117 C-2. 

L. Other Publications affected 

AMM MBB BK117 C-2 and IPC MBB BK117 C-2. 

M. Interchangeability of Parts 

Not applicable. 

2. Material Information 

A. Material - Price and Availability 

Information on cost and availability of required retrofit kit SB-117C2-26A-001-2C will be 

provided by ECD, Dept. Spares Order Administration on request. 

B. Support Information 

Not applicable. 

C. Material Necessary for Each Helicopter 

Retrofit kit SB-117C2-26A-001-2C. 

No. New P/N Keyword 

1 GBSM24/18W4SK GBSclamp 

- Clamp 

2 - Safety lacquer (CM680) 

* a.n. = as needed 

Disposition: 

A = New, included in kit. 

Old P/N Qty Disposition 

- 3 A 

NAS1 922-01 00-3 3 c 

or 

TORR01 6-27/9C7W5 

- a.n.* B 

B = Consumable material, to be ordered from the lnterturbine company as needed. 

CM item number i.a.w. list of consumable materials in the AMM. 

C = Part with old P/N is discarded 

Discarded parts are not taken back by ECD. 

MBB BK117 C-2-26A-001 

PAGE 2 of 4 

2007-01-22 
·~~[~fopter MBB BK117 C-2 

ALERT SERVICE BULLETIN 

D. Material Necessary for Each Spare 

Not applicable. 

E. Reidentified Parts 

Not applicable. 

F. Special Tooling 

Not applicable. 

3. Accomplishment Instructions 

A. Replace clamps: 

(1) If necessary, remove injection tubes i.a.w. AMM , 26-21-01 , 4-3. Discard removed 

clamps (1 , Figure 1). 

{2} Re-install injection tubes with new clamps (1, Figure 1) contained in retrofit kit i.a.w. 

AMM , 26-21 -01 , 4-3. Reposition injection tubes and clamps for proper bead alignment 

i.a.w. detail A, figure 1. Torque-tighten screws of new clamps (1) to 8 Nm. 

(3) Apply safety lacquer (CM 680) onto screws of clamps (1 , Figure 1 ). 

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

the helicopter. 

4. Appendix 

Not applicable. 

2007-01 -22 MBB BK117 C-2-26A-001 

PAGE 3 of 4 
·~~~~~opter MBB BK117 C-2 

ALERT SERVICE BULLETIN 

1 GBS clamp 

Clamp 

MBB BK117 C-2-26A-001 

PAGE 4 of 4 

ffi Before retrofit. 

& After retrofit. 

& Apply safety lacquer (CM 680) onto screw . 

.& Ensure bead alignment. 

GBSM24/18W4SK ill 

NA$1922-0100-3 & 

TORR016-27/9C7W5 & 

& DetaiiA 

A 

FLIGHT DIRECTION ~ 

Replacement of Injection Tube Clamps 

Figure 1 

8 Nm 

2007-01-22