Check Distribution Piping to Detect Leakage and Obstruction

TASK 26-21-00-720-003-C-02
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: 410
ZONE: 420

1. Reason for the Job
Refer to the MPD TASK: 262100-04
CHECK DISTRIBUTION PIPING TO DETECT LEAKAGE AND OBSTRUCTION.
SUBTASKS REFER TO LEFT AND RIGHT PYLONS SIDE.
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	1	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in )
98D26203001002	1	EXT FIRE TEST A320

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
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
415BL, 415BR, 425BL, 425BR
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-15-00-910-001-A	Handling Precautions for Electrostatic Discharge Sensitive Devices
TASK 26-21-41-400-001-A	Installation of the Engine Fire-Extinguisher Bottle
TASK 54-51-21-000-001-A	Removal of the Pylon Lateral Access-Doors
TASK 54-51-21-400-001-A	Installation of the Pylon Lateral Access-Doors
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Extinguisher Bottles
Distribution Line
Vibration Harness

3. Job Set-up
Subtask 26-21-00-865-105-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 26-21-00-860-077-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize FADEC 1(2).

Subtask 26-21-00-010-085-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 26-21-00-040-061-A ** ON A/C NOT FOR ALL

D. Deactivation of the Hydraulic Control Unit (HCU)

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Do the deactivation of the thrust reverser HCU for ground maintenance (Ref. AMM TASK 78-30-00-040-012).

Subtask 26-21-00-010-086-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(3) On the left engine pylon, remove access doors (Ref. AMM TASK 54-51-21-000-001):
415BL 415BR.
(4) On the right engine pylon, remove access doors (Ref. AMM TASK 54-51-21-000-001):
425BL 425BR.

Subtask 26-21-00-020-073-A ** ON A/C NOT FOR ALL

WARNING: DO NOT TOUCH THE CARTRIDGE BEFORE YOU DO THE PROCEDURE APPLICABLE TO DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE EXTINGUISHER BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.

F. Disconnection of the Electrical Connector from the Pylons Fire Extinguisher Bottles

Extinguisher Bottles ** ON A/C NOT FOR ALL

NOTE: If the two fire extinguisher bottles on left and right pylons are not installed, go to Para.4.A.

(1) Do these steps for each fire extinguisher bottle:
(a) Before you touch the cartridge, refer to the handling precautions for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(b) Disconnect the electrical connector (10) from the pressure switch (2).
(c) Disconnect the electrical connector (3) from the cartridge (4).
(d) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 26-21-00-020-074-A ** ON A/C NOT FOR ALL

G. Disconnection of the Pylons Fire Extinguisher Bottles

Extinguisher Bottles ** ON A/C NOT FOR ALL

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.

(1) Do these steps for each fire extinguisher bottle:
(a) Remove the four bolts (9) and washers (8) that attach the fire-extinguisher bottle (1).
(b) Loosen the nut (5).
(c) Disconnect the line (6).
(d) Put blanking plug on the discharge head (7).

4. Procedure
Subtask 26-21-00-720-067-A ** ON A/C NOT FOR ALL

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

NOTE: The 98D26203001002 EXT FIRE TEST A320 tool includes P/Ns 98D26203001042, 98D26203001044, 98D26203001046, 98D26203001048 and 98D26203001050.

(1) Obstruction test
(a) Connect the manifold coupling (18) (P/N 98D26203001042) to outlet E (detail D) of the line (6).
(b) Connect an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to the manifold assembly (17) (P/N 98D26203001050).
(c) Open the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY and the tap (15) of the manifold assembly (17):

Make sure that the air flows from outlets C, D and F (detail D), G and H (detail E) and A and B (detail C).

(d) Close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(2) Leak test
(a) Install the two screw plugs (11) (P/N 98D26203001048) on outlets A and B (detail C) of the line (6).
(b) Install the three plugs (12) (P/N 98D26203001044) on outlet F (detail D) and on outlets G and H (detail E) of the line (6).
(c) Install the two plugs (13) on outlets C and D (detail D) of the line (6):
1 If it is necessary to disengage the vibration harnesses to get access to outlets C and D:

Vibration Harness ** ON A/C NOT FOR ALL

Remove the nuts (23) and bolts (21) from the clips (22) and (24).
Disengage the clips (22) and (24) from the support tubes.

2 Install the two plugs (13) (P/N 98D26203001046) on outlets C and D (detail D) of the line (6).
(d) Open the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY and the tap (15) of the manifold assembly (17).
1 Pressurize the line (6) to 2 bar (29 psi) through the manometer (16) of the manifold assembly (17).
(e) Close the tap (15) of the manifold assembly (17) to isolate the line (6).
(f) Monitor the line (6) 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 line (6).
2 Examine the line (6) 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 line (6) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(h) Close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(i) Open the tap (14) of the manifold assembly (17) to depressurize the line (6).
(j) Disconnect the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY from the manifold assembly (17).
(k) Disconnect the manifold adapter (18) from outlet E (detail D) of the line (6).
(l) Remove the two screw plugs (11) from outlets A and B (detail C) of the line (6).
(m) Remove the three plugs (12) from outlet F (detail D) and outlets G and H (detail E) of the line (6).
(n) Remove the two plugs (13) from outlets C and D (detail D) of the line (6).
(o) If the vibration harnesses are disengaged:

Vibration Harness ** ON A/C NOT FOR ALL

Attach the clips (22) and (24) to the support tubes.
Install the bolts (21) and nuts (23).
TORQUE the nuts (23) to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in ) .

Subtask 26-21-00-420-067-A ** ON A/C NOT FOR ALL

B. Connection of the Pylons Fire Extinguisher Bottles

Extinguisher Bottles ** ON A/C NOT FOR ALL

(1) If the Pylons fire extinguisher bottles are not installed, install them (Ref. AMM TASK 26-21-41-400-001) and go to Para.5.A.
(2) If the fire extinguisher bottles are installed:

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) Do these steps for each fire extinguisher bottle:
1 Remove the blanking plug from the discharge head (7).
2 Connect the line (6) to the bottle (1).
(b) Tighten the nut (5) with your hand as follows:

While you hold the nut pin out of its housing, fully tighten the nut (5).
Loosen the nut (5) (not more than a quarter of turn) until the pin engages in its housing.

(c) Make sure that clearance J1 between the discharge head (7) and the nut (5) is not more than 4.3 mm (0.17 in.).
(d) Install the four washers (8) and bolts (9) that attach the fire-extinguisher bottle (1).

Subtask 26-21-00-081-054-B ** ON A/C NOT FOR ALL

C. Removal of the Safety Tools

Extinguisher Bottles ** ON A/C NOT FOR ALL

WARNING: BEFORE YOU TOUCH THE POWER DEVICE CARTRIDGE, MAKE SURE THAT YOU ARE GROUNDED AND THAT YOU INSTALL A SHUNT DEVICE ON IT. USE A CAP OR PLUG AS SHUNT DEVICE (THE CAP OR PLUG WILL SHUNT THE PINS TOGETHER ON THE CARTRIDGE). DO NOT USE A FOIL SHUNT. IF YOU TOUCH A POWER DEVICE CARTRIDGE THAT DOES NOT HAVE A SHUNT DEVICE INSTALLED, AN EXPLOSION CAN OCCUR AND CAUSE INJURIES TO YOU.

Subtask 26-21-00-420-068-A ** ON A/C NOT FOR ALL

D. Connection of the Electrical Connectors on the Pylons Fire Extinguisher Bottles

Extinguisher Bottles ** ON A/C NOT FOR ALL

(1) Do these steps for each fire extinguisher bottle:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connector (3) to the cartridge (4).
(d) Connect the electrical connector (10) to the pressure switch (2).

5. Close-up
Subtask 26-21-00-865-106-A ** ON A/C NOT FOR ALL

A. 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 26-21-00-410-086-A ** ON A/C NOT FOR ALL

B. 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 access doors (Ref. AMM TASK 54-51-21-400-001):
415BL 415BR.
(3) On the right engine pylon, install access doors (Ref. AMM TASK 54-51-21-400-001):
425BL 425BR.
(4) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 26-21-00-440-063-A ** ON A/C NOT FOR ALL

C. Do the re-activation of the thrust reverser HCU after ground maintenance (Ref. AMM TASK 78-30-00-440-012).

Subtask 26-21-00-410-087-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 26-21-00-942-067-A ** ON A/C NOT FOR ALL

E. 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 23:44:39 UTC