Installation of the Duct Assy

TASK 36-11-49-400-007-A
Installation of the Duct Assy

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

ZONE: 454
ZONE: 464
FIN: 7125HM1 ** ON A/C NOT FOR ALL
FIN: 7125HM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
454	HOT SECTION
464	HOT SECTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. 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 24-41-00-862-002-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 36-12-00-860-001-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-002-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
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
Duct Assy

3. Job Set-up
Subtask 36-11-49-860-071-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that engine 1(2) is shutdown for a minimum of 5 minutes before you do this procedure.
(3) In the cockpit, on AIR COND panel 30VU:

Make sure that the ENG 1(2) BLEED pushbutton-switch is released (the OFF legend is on)
Make sure that the APU BLEED pushbutton-switch is released (the ON legend is off)
Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the pneumatic system.

(4) In the cockpit, on ENG panel 115VU:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to start engine 1(2).

(5) On the HP ground connector:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the pneumatic system.

(6) In the cockpit, on the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton-switch is off
Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

(7) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position below the engine.

Subtask 36-11-49-010-126-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-49-040-096-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 36-11-49-420-085-A ** ON A/C NOT FOR ALL

A. Installation of the Duct Assy
(1) If you use the APU to energize the electrical circuits, stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.
(5) Remove the protective covers from the duct assy (3) and the ducts.
(6) Remove the blanking plugs from the disconnected line ends.
(7) Install the duct assy (3).

NOTE: The arrow which shows the direction of the flow of air must point up.

CAUTION: MAKE SURE THAT THE SCREWS OF THE ATTACHMENT CLAMPS ON THE OVERPRESSURE VALVE ARE IN THE CORRECT POSITION. IF NOT, THE SCREWS CAN CAUSE DAMAGE TO THE FIREWALL OF THE THRUST REVERSER COWL.

(8) Install the clamps (2) but do not fully tighten them.
(9) Torque the clamps (2) to the value given on the clamps.
(10) Connect the sense line (1) to the duct assy (3) and TORQUE the nut to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

Subtask 36-11-49-710-057-A ** ON A/C NOT FOR ALL

B. Do this test.
(1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-002) or with the APU (Ref. AMM TASK 36-12-00-860-001).
(a) Make sure that there are no leaks at the junctions between the overpressure valve, the sense lines and the ducts on the related engine.

5. Close-up
Subtask 36-11-49-410-106-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 doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-49-440-074-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-49-410-107-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 36-11-49-862-078-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:10:14 UTC