Removal of the Starter Valve Elbow-Duct and the Precooler Exchanger Tee-Duct in the Pylon

TASK 36-11-49-000-821-A
Removal of the Starter Valve Elbow-Duct and the Precooler Exchanger Tee-Duct in the Pylon

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

CAUTION: USE A SECOND WRENCH TO APPLY COUNTER TORQUE TO THE UNION ON THE VALVE WHEN YOU CONNECT THE HP SENSE TUBE.

ZONE: 453
ZONE: 463

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 4M (13 FT)-ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
453	HOT SECTION
463	HOT SECTION
413AL, 413BL, 423AL, 423BL
411AT, 413AR, 413BR, 421AT, 423AR, 423BR
411AL, 414AR, 414BR, 421AL, 424AR, 424BR

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 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
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))
Starter Valve Elbow-Duct and Precooler Exchanger Tee-Duct in the Pylon

3. Job Set-up
Subtask 36-11-49-861-109-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-49-941-128-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On the AIR COND control-panel 30VU:

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

(3) On the ENG control-panel 115VU:

Put a WARNING NOTICE(S) in position to tell persons not to start the engine 1(2).

(4) On the HP ground connector:

Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

(5) On the ENG section of the maintenance panel 50VU:

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

Subtask 36-11-49-010-218-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the engine.
(2) Remove these access panels:

For the left pylon: 411AL 413AL 413BL 414AR 414BR
For the right pylon: 421AL 423AL 423BL 424AR 424BR.

Subtask 36-11-49-010-218-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the engine.
(2) Remove these access panels:

For the left pylon: 411AT 413AL 413BL 413AR 413BR
For the right pylon: 421AT 423AL 423BL 423AR 423BR.

4. Procedure
Subtask 36-11-49-020-141-A ** ON A/C NOT FOR ALL

A. Removal of the Starter Valve Elbow-Duct and the Precooler Exchanger Tee-Duct from the Pylon
(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 TASK 49-00-00-860-006)
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) Removal of the starter valve elbow-duct as follows:
(a) Remove the bolts (8) and washers (9) from the support (10).
(b) Remove the clamps (7) and (12) to disengage the duct (11).
(c) Remove and discard the seal (13).
(d) Remove the support (10) and the duct (11).
(4) Removal of the precooler exchanger tee-duct as follows:
(a) Remove the bolts (4) and the washers (3) from the support (2) of the duct (1).
(b) Remove the clamps (5) and (6).
(c) Disengage the duct (1).
(d) Remove the duct (1).
(e) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 12:38:37 UTC