January 31/12 (Revision 1) Service Bulletin No A26-081

Page 1 of 5

ALERT SERVICE BULLETIN

Kidde Graviner Limited

Mathisen Way

Colnbrook, Slough, Berkshire, SL3 0HB, United Kingdom

Telephone +44 (0) 1753 683245 Fax +44 (0) 1753 685040

HAND OPERATED FIRE EXTINGUISHER - FAILURE TO OPERATE

1. Planning Information

A. Effectivity

Aircraft affected: Various

Unit affected: Hand Operated Fire Extinguisher

Part Nos. 56412-001 (34H), 56411-001 (35H) and 56412-002 (38H)

B. Concurrent Requirements

(1) None.

C. Reason

(1) An instance has occurred where an operator has tried to use the fire extinguisher, but the

extinguisher has failed to operate when the lever has been pressed. 

D. Description

(1) This Service Bulletin tells operators to remove the body and operating components, apply adhesive

to the gland nut and re-install the body and operating components.

E. Compliance

(1) It is recommended that the content of this Service Bulletin be done in accordance with the

requirements of the relevant aircraft OEM. Kidde Graviner recommends that only approved repair

organisations do the procedure in this Service Bulletin or alternatively the extinguisher is returned to

Kidde Graviner. 

F. Approval

(1) Kidde Graviner have technically approved the content of this service bulletin. 

G. Manpower

(1) It will take an estimated 25 hours to do this Service Bulletin.

NOTE: It is assumed that the equipment has been put in a maintenance status. The man-hour

estimates do not include time for preparation, close-out or administrative functions.

H. Weight and Balance

(1) None.

I. References

(1) Aircraft Maintenance Manual.

J. Other Publications Affected

(1) Component Maintenance Manual 26-24-01.
Aug 23/11 Service Bulletin No A26-081

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ALERT SERVICE BULLETIN

Kidde Graviner Limited

2. Material Information

A. Material

(1) These materials are necessary:

(a) Fluid, Dow Corning DC200/10cS

(b) Adhesive, Loctite 243

(c) Grease, Silicone DC4,

B. Tooling

(1) These special tools are necessary:

(a) Adaptor 671-776 - to remove cap assembly.

(b) Insertion/Removal Tool 34HR26 - to remove/install gland nut.

3. Accomplishment Instructions

A. General

(1) References in parentheses are to the Illustrated Parts List Figure/item No. in the Component

Maintenance Manual 26-24-01.

B. Procedure

WARNING: DAMAGE TO A PRESSURIZED CONTAINER CAN CAUSE DEATH OR SERIOUS INJURY.

HANDLE CONTAINERS WITH CARE. DO NOT DROP, OR CAUSE DAMAGE TO, A

CONTAINER.

(1) Removal

(a) Secure the container in a vice in a suitable protective clamp.

WARNING:DURING THE PROCEDURE THAT FOLLOWS, TAKE CARE NOT TO KNOCK,

DAMAGE OR PULL UP THE VALVE (1-130). ANY UNNECESSARY FORCE MAY

BREAK THE FRANGIBLE PLUG IN THE SYPHON TUBE SUBASSEMBLY AND

CAUSE THE EXTINGUISHANT TO FLOW THROUGH THE VALVE. RELEASE OF

EXTINGUISHANT CAN CAUSE SERIOUS INJURY OR DEATH.

(b) Remove the cap assembly (1-70) with the Cap Removal Tool 34R26. Discard the cap

assembly (1-70) if the indicator disc has been pierced.

(c) Remove the pivot pin (1-40) and remove the lever (1-60) and washers (1-50).

(d) Use a forked screwdriver to remove the lever bolt (1-90).

(e) If installed, remove the sealing cap (1-30). Remove the nozzle (1-10) and the nozzle washer

(1-20).

(f) Install the Adaptor 671-776 in the bore for the nozzle (1-10) and remove the body (1-80).

(g) Remove the spring (1-120).

(h) Remove the gland nut (1-110) with the Insertion/Removal Tool 34HR26. Remove and discard

the gland packing (1-100).

(i) Install a dummy body (1-80) temporarily onto the container (1-180) over the valve (1-130) to

prevent damage to the valve and subsequent release of extinguishant.
 January 31/12 (Revision 1) Service Bulletin No A26-081

Page 3 of 5

ALERT SERVICE BULLETIN

Kidde Graviner Limited

Mathisen Way

Colnbrook, Slough, Berkshire, SL3 0HB, United Kingdom

Telephone +44 (0) 1753 683245 Fax +44 (0) 1753 685040

(2) Assembly

(a) Soak a new gland packing (1-100) in fluid, Dow Corning DC200/10cS for at least 30 minutes.

Remove any excess fluid.

(b) Use the Insertion/Removal Tool 34HR26 to install the gland packing (1-100) into the body

(1-80).

(c) Apply adhesive, Loctite 243, to cover the threads of the gland nut (1-110) and use the

Insertion/Removal Tool 34HR26 to install the gland nut (1-110) into the body (1-80) one to two

threads only. 

(d) Install the lever bolt (1-90) carefully into the body and through the gland packing and gland.

(e) Use the Insertion/Removal Tool 34HR26 to fully install the gland nut (1-110) in the body. Turn

the gland nut (1-110) fully out and then fully in to make sure that the threads are completely

coated with adhesive. Tighten the gland nut (1-110) so that it is level with, or not more than

0.04 in (1,0 mm) above the shoulder of the body. Let the adhesive, Loctite 243, cure for 24

hours.

(f) Install the spring (1-120).

(g) Use a forked screwdriver to screw the lever bolt (1-90) into the valve two complete turns only.

WARNING:DURING THE PROCEDURE THAT FOLLOWS, TAKE CARE NOT TO KNOCK,

DAMAGE OR PULL UP THE VALVE (1-130). ANY UNNECESSARY FORCE MAY

BREAK THE FRANGIBLE PLUG IN THE SYPHON TUBE SUBASSEMBLY AND

CAUSE THE EXTINGUISHANT TO FLOW THROUGH THE VALVE. RELEASE OF

EXTINGUISHANT CAN CAUSE SERIOUS INJURY OR DEATH.

(h) Remove the dummy body (1-80) from the container (1-180).

(i) Install the body (1-80) onto the syphon tube assembly.

(j) Use the Adaptor 671-776 to tighten the body (1-80) to between 38 and 43 N m (28 and

32 lbf ft).

(k) Install the sealing washer (1-20) and nozzle assembly (1-10). Tighten the nozzle assembly

(1-10) to between 8,2 and 10,1 N m (6 and 7.5 lbf ft).

(l) Install the lever (1-60) and spacing washers (1-50). Assemble the pivot pin (1-40) to the body

(1-80) through the first washer (1-50), the lever (1-60) and second washer (1-50). Screw in

the pivot pin (1-40) one to two turns only. Apply adhesive, Loctite 243, to the threads in the

body (1-80) for the pivot pin (1-40). Turn the pivot pin (1-40) fully in, fully out and then fully in

to make sure that the threads are completely coated with adhesive. Tighten the pivot pin

(1-40) until it is level with the body (1-80).

(m) Use a forked screwdriver to a turn the lever bolt (1-90) to give a free movement at the end of

the lever (1-60) of approximately 0,76 mm (0.030 in).

(n) Apply adhesive, Loctite 243, to the threads of a new cap assembly (1-70) and install hand

tight.

(o) Apply grease, Silicone DC4, to the inside surfaces of the sealing cap (1-30) and install the

sealing cap over the nozzle (1-10).

(p) Use a suitable indelible black marker pen and write the service bulletin number on the

extinguisher head in the position shown: refer to Figure 1.

(3) Complete the maintenance documentation.
January 31/12 (Revision 1) Service Bulletin No A26-081

Page 4 of 5

ALERT SERVICE BULLETIN

Kidde Graviner Limited

Figure 1

Identification

WRITE THE 

SERVICE 

BULLETIN 

NUMBER 

HERE
January 31/12 (Revision 1) Service Bulletin No A26-081

Page 5 of 5

ALERT SERVICE BULLETIN

Kidde Graviner Limited

Service Bulletin Accomplishment Record

Unit Part Number: __________________

Unit Serial Number: __________________

Service Bulletin Accomplished by:

 Name (please print): __________________________________________________

 Signature: __________________________________________________

 

 Company: __________________________________________________

 Date Accomplished: __________________________________________________

Please Fax or email this completed form to:

Kidde Graviner Limited

for the attention of

Tony Carroll, Aircraft Support Manager

Fax: +44 (0) 1753 685040

email: Tony.Carroll@hs.utc.com