Shimming Procedure for the Engine Fire-Extinguishing Pipe

TASK 26-21-49-820-001-A
Shimming Procedure for the Engine Fire-Extinguishing Pipe

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 410
ZONE: 420

1. Reason for the Job
To install the engine fire-extinguishing pipe without stress.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.10AGB1)	Surface Pretreatment-Immersion use Nitric Acid Technical -
(Material No.10AGC1)	Surface Pretreatment-Immersion use Sodium Dichromate -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
FOR [1000EM1] (ENGINE-1)
413AL, 415AL, 415BL, 437AL, 451AL
FOR [1000EM2] (ENGINE-2)
423AL, 425AL, 425BL, 447AL, 461AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 54-57-22-000-001-A	Removal of the Apron Assemblies
TASK 54-57-22-400-001-A	Installation of the Apron Assemblies
TASK 71-13-11-000-040-A	Removal of the Fan Cowl Doors
TASK 71-13-11-400-040-A	Installation of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-32-11-000-040-A	Removal of the Left or Right Half Door of Thrust Reverser
TASK 78-32-11-400-040-A	Installation of the Left or Right Half Door of Thrust Reverser
Installation of the Shim.
Fabrication of the Shim.

3. Job Set-up
Subtask 26-21-49-941-060-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine 1(2).
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).
(4) On the AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released.
(b) Make sure that the APU BLEED pushbutton switch is released.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(5) In the cockpit, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

Subtask 26-21-49-865-063-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

Subtask 26-21-49-010-063-A ** ON A/C NOT FOR ALL

C. Get Access

NOTE: If the engine is removed, the removal of the fan cowl doors below is not applicable.

(1) Remove the left fan cowl door (Ref. AMM TASK 71-13-11-000-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL,
(b) FOR [1000EM2] (ENGINE-2)
447AL.

Subtask 26-21-49-040-054-A ** ON A/C NOT FOR ALL

D. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-21-49-010-064-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Remove the left half door of thrust reverser: (Ref. AMM TASK 78-32-11-000-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL,
(b) FOR [1000EM2] (ENGINE-2)
461AL.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) Remove the access panels:
(a) FOR [1000EM1] (ENGINE-1)
413AL,
(b) FOR [1000EM2] (ENGINE-2)
423AL.
(4) Remove the access panels:
(a) FOR [1000EM1] (ENGINE-1)
415AL 415BL,
(b) FOR [1000EM2] (ENGINE-2)
425AL 425BL.
(5) Remove the apron assemblies (Ref. AMM TASK 54-57-22-000-001).

Subtask 26-21-49-220-050-A ** ON A/C NOT FOR ALL

F. Initial Measurement

Installation of the Shim. ** ON A/C NOT FOR ALL

(1) Remove the bolts (4) and the washers (3).
(2) Measure the distance A between the bracket assy (2) and the cross beam (5).

NOTE: Make sure that the holes of the bracket assy and the cross beam are aligned.

(a) If the distance A is equal to zero, no maintenance action is necessary. Install the washers (3), the bolts (4) and tighten them.
(b) If the distance A is different from zero, do the procedure that follows.

Subtask 26-21-49-918-050-A ** ON A/C NOT FOR ALL

G. Fabrication of the Shim

Fabrication of the Shim. ** ON A/C NOT FOR ALL

(1) Use Material Z10CNT1810 or equivalent (AISI 321) to make the shim.

NOTE: Make sure that the thickness of the shim is equal to the distance A.

NOTE: 5 mm (0.196 in.) is the maximum permitted thickness.

Subtask 26-21-49-916-050-A ** ON A/C NOT FOR ALL

H. Preparation of the Shim

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

WARNING: DO NOT LET COMPRESSED GAS TOUCH YOUR SKIN. THE GAS CAN GO THROUGH THE SKIN AND MAKE BUBBLES IN THE BLOOD. THIS CONDITION CAN KILL YOU.

(1) Immerse the shim in a solution of:

Surface Pretreatment-Immersion use Nitric Acid Technical - (Material No.10AGB1) 250 ml/l (57.64 cu.in/US gal)
Surface Pretreatment-Immersion use Sodium Dichromate - (Material No.10AGC1) 25 g/l (3.32 oz/US gal)
de-ionized water 750 ml/l (172.93 cu.in/US gal).

NOTE: Make sure that the solution is between 45 deg.C (113.00 deg.F) and 55 deg.C (131.00 deg.F).

(2) Remove the shim from the solution after 20 to 40 minutes.
(3) Flush the shim with cold water.
(4) Flush the shim with hot water then dry it with compressed air.

4. Procedure
Subtask 26-21-49-420-057-A ** ON A/C NOT FOR ALL

A. Installation of the Shim

Installation of the Shim. ** ON A/C NOT FOR ALL

(1) Put the shim (6) in position between the bracket assy (2) and the cross beam (5).
(2) Install the washers (3) and the bolts (4).
(3) Tighten the bolts (4).

5. Close-up
Subtask 26-21-49-410-057-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the apron assemblies (Ref. AMM TASK 54-57-22-400-001).
(3) Install the access panels:
(a) FOR [1000EM1] (ENGINE-1)
415BL 415AL,
(b) FOR [1000EM2] (ENGINE-2)
425BL 425AL.
(4) Install the access panels:
(a) FOR [1000EM1] (ENGINE-1)
413AL,
(b) FOR [1000EM2] (ENGINE-2)
423AL.
(5) Install the left half door of the thrust reverser (Ref. AMM TASK 78-32-11-400-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL,
(b) FOR [1000EM2] (ENGINE-2)
461AL.

Subtask 26-21-49-440-052-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 26-21-49-410-058-A ** ON A/C NOT FOR ALL

C. Close Access

NOTE: If the engine is removed, the installation of the fan cowl doors below is not applicable.

(1) Install the left fan cowl door (Ref. AMM TASK 71-13-11-400-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL,
(b) FOR [1000EM2] (ENGINE-2)
447AL.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

Subtask 26-21-49-865-064-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41

[Rev.10 from 2021] 2026.03.31 23:45:06 UTC