Check Distribution Piping to Detect Leakage and Obstruction

TASK 26-21-00-720-003-A-01
Check Distribution Piping to Detect Leakage and Obstruction

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

ZONE: 415
ZONE: 425

1. Reason for the Job
Refer to the MPD TASK: 262100-04
CHECK DISTRIBUTION PIPING TO DETECT LEAKAGE AND OBSTRUCTION.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	1	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D26203002006	1	TEST TOOL-ENGINE FIRE EXTINGUISHING SYSTEM

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
415	LOWER PYLON
425	LOWER PYLON
415BL, 415BR, 425BL, 425BR, 437AL, 438AR, 447AL, 448AR
FOR [1000EM1] (ENGINE-1)
451AL, 452AR
FOR [1000EM2] (ENGINE-2)
461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 26-21-41-400-001-A	Installation of the Engine Fire-Extinguisher Bottle
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing 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 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Distribution Line

3. Job Set-up
Subtask 26-21-00-865-088-A ** ON A/C NOT FOR ALL

A. 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 26-21-00-860-071-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
Put a WARNING NOTICE(S) to tell persons not to start the engine.

(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 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) to tell persons not to energize the FADEC 1(2).

Subtask 26-21-00-010-072-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors:
(Ref. AMM TASK 71-13-00-010-040)
(a) For engine 1,
437AL 438AR.
(b) For engine 2,
447AL 448AR.

Subtask 26-21-00-040-055-A ** ON A/C NOT FOR ALL

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

Subtask 26-21-00-010-073-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
(2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(3) On the left engine pylon, remove the access doors:
415BL 415BR.
(4) On the right engine pylon, remove the access doors:
425BL 425BR.

4. Procedure
Subtask 26-21-00-720-061-A ** ON A/C NOT FOR ALL

A. Functional Test to Do a Check of the Distribution Piping for Leakage and Obstruction
(1) Obstruction test

WARNING: BE VERY CAREFUL WHEN YOU MOVE A FULL FIRE EXTINGUISHER BOTTLE. A SUDDEN OR HEAVY SHOCK TO A FULL BOTTLE CAN CAUSE UNWANTED DISCHARGE AND INJURY TO PERSONS.

(a) On the related pylon:

NOTE: If the fire extinguisher bottles are not installed, go to the step (b).

1 Remove the four screws and washers that attach the aft fire-extinguisher bottle (7).
2 Disconnect the line (3) from the discharge head (4) and move the fire extinguisher bottle (7) to get access to the line (3).
3 Remove the four screws and washers that attach the forward fire-extinguisher bottle (10).
4 Disconnect the line (2) from the discharge head (6) and move the fire extinguisher bottle (10) to get access to the line (2).
(b) Connect the manifold assembly (8) of the 98D26203002006 TEST TOOL-ENGINE FIRE EXTINGUISHING SYSTEM to the outlet A (detail E).
(c) Connect an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to the manifold assembly (8).
(d) Open the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY and make sure that the air flows from the outlets B, C, D, and E (detail B) and F and G (detail C).
(e) Close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(2) Leak test
(a) Install the plug assies (11) of the 98D26203002006 TEST TOOL-ENGINE FIRE EXTINGUISHING SYSTEM on the outlets F and G of the lines (2) and (3) (details C and F).
(b) Install the pipe blanks (9) of the 98D26203002006 TEST TOOL-ENGINE FIRE EXTINGUISHING SYSTEM on the outlets E and D (detail D) and the outlet C (detail E).
(c) Install the pipe blank (5) of the 98D26203002006 TEST TOOL-ENGINE FIRE EXTINGUISHING SYSTEM on the outlet B (detail E).
(d) Pressurize the line to 2 bar (29 psi).
(e) Close the valve of the manifold assembly (8) to isolate the extinguishing line.
(f) Monitor the lines (1), (2) and (3) for 10 minutes to:
1 Make sure that there is no leakage.
2 Make sure that the pressure does not decrease by more than 0.2 bar (3 psi).
(g) If the pressure decreases by more than 0.2 bar (3 psi), do a leak check:
1 Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) on the lines (1), (2) and (3).
2 Examine the lines (1), (2) and (3) for leaks.
3 If you find a leak, replace the defective component(s) and do the leak check again.
4 Remove the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) from the lines (1), (2) and (3) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(h) Close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(i) Open the drain valve to depressurize the extinguishing line.
(j) Disconnect the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(k) Disconnect the manifold assembly (8) from the line.
(l) Remove the pipe blank (5), the pipe blanks (9) and the plug assies (11).

5. Close-up
Subtask 26-21-00-860-072-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) If the bottles were not installed, install them (Ref. AMM TASK 26-21-41-400-001) and go to the step B.
(2) Connect the lines (2) and (3) to the discharge heads (6) and (4) (Ref. AMM TASK 26-21-41-400-001).
(3) Install the four screws and washers which attach the aft fire-extinguisher bottle (7).
(4) Install the four screws and washers which attach the forward fire-extinguisher bottle (10).

Subtask 26-21-00-865-089-A ** ON A/C NOT FOR ALL

B. 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

Subtask 26-21-00-410-072-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On the left engine pylon, install the access doors:
415BL 415BR.
(3) On the right engine pylon, install the access doors:
425BL 425BR.
(4) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 26-21-00-440-057-A ** ON A/C NOT FOR ALL

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

Subtask 26-21-00-410-073-A ** ON A/C NOT FOR ALL

E. Close Access
(1) Close the fan cowl doors:
(Ref. AMM TASK 71-13-00-410-040)
(a) For engine 1,
437AL 438AR.
(b) For engine 2,
447AL 448AR.

Subtask 26-21-00-942-065-A ** ON A/C NOT FOR ALL

F. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.03.31 23:44:35 UTC