Check Distribution Piping to Detect Leakage and Obstruction

TASK 26-21-00-720-803-A
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: 400

1. Reason for the Job
Refer to the MPD TASK: 262100-07
CHECK DISTRIBUTION PIPING TO DETECT LEAKAGE AND OBSTRUCTION.
SUBTASKS REFER TO BOTH ENGINE SIDES.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	AR	CAP - BLANKING
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )
98D26203005000	1	EXTING. FIRE TEST CFM LEAP X
M83723-60-18AN	AR	CAP, PROTECTIVE

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
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
415BL, 415CR, 437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
425BL, 425CR, 447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	SEALS	AIPC 26-21-86-52-150
9	SEALS	AIPC 26-21-86-53-150

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-15-00-910-001-A	Handling Precautions for Electrostatic Discharge Sensitive Devices
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 54-51-21-000-804-A	Removal of the Pylon Lateral Access-Doors
TASK 54-51-21-400-803-A	Installation of the Pylon Lateral Access-Doors
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Disconnection of the Engine Fire Extinguisher Bottles
Distribution Line - Test (CFM LEAP)

3. Job Set-up
Subtask 26-21-00-861-068-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 26-21-00-941-071-A

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) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(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 overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC system 1(2).

Subtask 26-21-00-865-104-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 6WE2 (BOTTLE 1FIRE EXTING, ENG 2) FOR FIN: 6WE1 (BOTTLE 1FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
FOR FIN: 8WE2 (BOTTLE 2FIRE EXTING, ENG 2) FOR FIN: 8WE1 (BOTTLE 2FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40

Subtask 26-21-00-010-082-A

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.

Subtask 26-21-00-040-059-A

E. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 26-21-00-010-083-A

F. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR.
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR.
(3) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
(4) Remove these access doors (Ref. AMM TASK 54-51-21-000-804):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
415BL 415CR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
425BL 425CR.

Subtask 26-21-00-020-068-A

G. Disconnect the Electrical Connector on the Pylons Fire Exthinguisher Bottles

Disconnection of the Engine Fire Extinguisher Bottles

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.

(1) Before you touch the cartridge, do the procedure for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(2) Disconnect the electrical connector (4) from the pressure switch (5).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 26-21-00-481-052-A

H. Installation of the Safety Tool

Disconnection of the Engine Fire Extinguisher Bottles

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.

(1) Disconnect the electrical connector (6) from the cartridge (7).
(2) Put a M83723-60-18AN CAP, PROTECTIVE on the cartridge (7).

Subtask 26-21-00-020-069-A

I. Disconnection of the Pylons Fire Extinguisher Bottles

Disconnection of the Engine Fire Extinguisher Bottles

(1) Loosen the nut of the coupling (2) to disconnect the line (1) from the discharge head (8).
(2) Remove the coupling (2).
(3) Remove and discard the seal (9).
(4) Put blanking plug on the discharge head (8).

4. Procedure
Subtask 26-21-00-720-066-A

A. Functional Test of the Distribution Piping for Leakage and Obstruction

Distribution Line - Test (CFM LEAP)

NOTE: The P/Ns 98D26203005048, 98D26203005052, 98D26203005054, 98D26203005056, 98D26203005058 are parts of the 98D26203005000 EXTING. FIRE TEST CFM LEAP X.

(1) Obstruction test
(a) Connect the coupling (14) of the support for pressure indicator (15) (P/N 98D26203005048) to outlet D (detail H).
(b) Connect a AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to the support for pressure indicator (15).
(c) Open the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY and the tap (16) of the support for pressure indicator (15) and make sure that the air flows from outlets A (detail D), B and C (detail E), E and F (detail F) and G and H (detail G).
(d) Close the tap (16) of the support for pressure indicator (15) and close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(2) Leak test
(a) Install the sealing plug (10) (P/N 98D26203005056) on the outlet A (detail D).
(b) Install the two sealing plugs (11) (P/N 98D26203005052) on the outlets B and C (detail E).
(c) Install the two sealing plugs (12) (P/N 98D26203005058) on the outlets E and F (detail F).
(d) Install the two sealing plugs (13) (P/N 98D26203005054) on the outlets G and H (detail G).
(e) Open the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY and the tap (16) of the support for pressure indicator (15).
(f) Pressurize the line to 2 bar (29 psi) through the manometer (17) of the support for pressure indicator (15).
(g) Close the tap (16) of the support for pressure indicator (15) to isolate the extinguishing line.
(h) Monitor the extinguishing pipe (1) 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).
(i) 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 extinguishing pipe (1).
2 Examine the extinguishing pipe (1) 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 extinguishing pipe (1) with a Textile-Lint free Cotton - (Material No.14SBA1) .
(j) Close the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(k) Open the drain tap (18) of the support for pressure indicator (15) to depressurize the extinguishing pipe (1).
(l) Disconnect the AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY from the support for pressure indicator (15).
(m) Disconnect the coupling (14) of the support for pressure indicator (15) from the outlet D (detail H).
(n) Remove the sealing plug (10) from the outlet A (detail D).
(o) Remove the two sealing plugs (11) from the outlets B and C (detail E).
(p) Remove the two sealing plugs (12) from the outlets E and F (detail F).
(q) Remove the two sealing plugs (13) from the outlets G and H (detail G).

Subtask 26-21-00-420-061-A

B. Connection of the Pylons Engine Fire-Extinguisher Bottles

Disconnection of the Engine Fire Extinguisher Bottles

WARNING: MAKE SURE THAT THE MAXIMUM PERMITTED LIFE (MPL) OF THE CARTRIDGE IS LONGER THAN THE TIME TO THE NEXT SCHEDULED DISCARD OF THE CARTRIDGE.

(1) Do an inspection of the component interfaces and the adjacent area.
(2) Clean the component interfaces and the adjacent area.
(3) Install new AIPC 26-21-86-52-150 SEALS (9) for left pylon and new AIPC 26-21-86-53-150 SEALS (9) for right pylon on the discharge head (8).
(4) Connect the line (1) to the discharge head (8).
(5) Install the coupling (2) on the line (1).
(6) TORQUE the nut of the coupling (2) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

Subtask 26-21-00-081-051-A

C. Removal of the Safety Tool

Disconnection of the Engine Fire Extinguisher Bottles

(1) Before you touch the cartridge, do the procedure for devices that are sensitive to electrostatic discharge (Ref. AMM TASK 20-15-00-910-001).
(2) Remove the M83723-60-18AN CAP, PROTECTIVE from the cartridge (7).

Subtask 26-21-00-420-062-A

D. Connect the Electrical Connectors

Disconnection of the Engine Fire Extinguisher Bottles

(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Connect the electrical connector (6) to the cartridge (7).
(4) Connect the electrical connector (4) to the pressure switch (5).

Subtask 26-21-00-865-103-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 6WE2 (BOTTLE 1FIRE EXTING, ENG 2) FOR FIN: 6WE1 (BOTTLE 1FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
FOR FIN: 8WE2 (BOTTLE 2FIRE EXTING, ENG 2) FOR FIN: 8WE1 (BOTTLE 2FIRE EXTING, ENG 1)
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40

5. Close-up
Subtask 26-21-00-410-083-A

A. Put the aircraft back to its initial configuration.
(1) Removal of the engine protection covers

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Remove all the COVER - PROTECTION.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close these access doors (Ref. AMM TASK 54-51-21-400-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
415BL 415CR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
425BL 425CR.
(4) Close the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR.

Subtask 26-21-00-440-061-A

B. Reactivation of the Thrust Reverser System after Ground Maintenance
(1) Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 26-21-00-410-084-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 26-21-00-862-068-A

D. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:44:43 UTC