Test No. 1 - Pneumatic Leak Test [PW11]

TASK 71-00-00-790-802-A
Test No. 1 - Pneumatic Leak Test

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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
Use this procedure to check the pneumatic ducts and component joints for leaks.
The engine is operated at idle speed only for this test.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
98F10103500000	2	CHOCK-MLG,ENGINE RUN-UP

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-110)	Lockwire
(Material No.P05-169)	Foil Wrap
(Material No.P05-237)	PMC 4357 fluorescent penetrant developer

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
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 71-00-00-860-814-A	Shutdown of the Engine
TASK 71-00-00-860-823-A	Start the Engine (Normal Automatic Start)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-00-00-910-803-A	Engine Operation Limits and Guidelines
TASK 71-00-00-910-804-A	General Warnings and Cautions and Related Safety Data
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Tool Installation
Leak Check of the Pneumatic System

3. Job Set-up
Subtask 71-00-00-941-126-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that all the parts, tools, equipment and loose objects are removed from the engine air intake and the area around the intake.
(2) Make sure that the aircraft is clean and that there are no persons in the dangerous areas.
(3) Obey the engine safety precautions (Ref. AMM TASK 71-00-00-910-804) and the engine operation limits and guidelines procedure (Ref. AMM TASK 71-00-00-910-803).

Subtask 71-00-00-860-190-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(3) Put in position the wheel 98F10103500000 CHOCK-MLG,ENGINE RUN-UP at each forward outboard MLG wheel.

Tool Installation ** ON A/C NOT FOR ALL

Subtask 71-00-00-010-174-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.

Subtask 71-00-00-040-099-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser System for 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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 71-00-00-010-175-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 71-00-00-480-084-A ** ON A/C NOT FOR ALL

A. Preparation before the Test

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

(1) Use one of the two methods that follow to prepare the joints:
(a) Put Foil Wrap (Material No.P05-169) around the pneumatic joints:

Leak Check of the Pneumatic System ** ON A/C NOT FOR ALL

1 Wind the foil wrap around the joint one time.
2 Twist the seam of the foil tight as shown.
3 Make the foil as tight as possible on the tube but do not rip the foil.
4 Attach the foil with lockwire:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

a Attach the foil with Lockwire (Material No.P05-110) at both sides of the pneumatic joint.
(b) Apply PMC 4357 fluorescent penetrant developer (Material No.P05-237) around the pneumatic joints.

Subtask 71-00-00-410-163-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) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

Subtask 71-00-00-440-093-A ** ON A/C NOT FOR ALL

C. Do the reactivation of the thrust reverser system after the deactivation for maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 71-00-00-410-164-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.
(2) Remove the access platform(s).

Subtask 71-00-00-720-078-A ** ON A/C NOT FOR ALL

E. Pneumatic Leak Test
(1) Perform a normal automatic engine start (Ref. AMM TASK 71-00-00-860-823).
(2) Let the engine become stable for five minutes at IDLE power.
(3) Make sure that all the engine parameters are in the permitted limits (Ref. AMM TASK 71-00-00-910-803).
(4) Operate the engine at IDLE power for five minutes.
(5) Do the shutdown of the engine (Ref. AMM TASK 71-00-00-860-814).

Subtask 71-00-00-010-176-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.

Subtask 71-00-00-040-100-A ** ON A/C NOT FOR ALL

G. Deactivation of the Thrust Reverser System for 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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 71-00-00-010-177-A ** ON A/C NOT FOR ALL

H. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 71-00-00-210-099-A ** ON A/C NOT FOR ALL

I. Inspection of the Pneumatic Joints

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

(1) Do an inspection of the joints that you prepared before for leaks as follows:
(a) Remove the lockwire:

1 Remove Lockwire (Material No.P05-110) and foil wrap from all the joints.

Leak Check of the Pneumatic System ** ON A/C NOT FOR ALL

(b) A joint with foil will show a rip in the foil if the joint has a leak.
(c) A joint with developing powder will show a streak if the joint has a leak.
(d) Repair the joints that leak and test the repaired joints again by the above procedures, if necessary.
(e) Wipe off the developer with a clean cloth, if necessary.
(f) Make sure that all the safety wire, foil and tools are removed from the engine.

5. Close-up
Subtask 71-00-00-410-165-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) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

Subtask 71-00-00-440-094-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after the deactivation for maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 71-00-00-410-166-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.

Subtask 71-00-00-860-191-A ** ON A/C NOT FOR ALL

D. Put the aircraft back to its initial configuration.
(1) Remove the access platform(s).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 08:19:11 UTC