Removal of the Upper HP Duct and Mid Stage T-Duct Assembly links

TASK 36-11-49-000-843-A
Removal of the Upper HP Duct and Mid Stage T-Duct Assembly links

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

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
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 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 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
Upper HP Duct-Links
Mid-Stage T-Duct Links
FOR [1000EM1] (ENGINE-1)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
FOR [1000EM2] (ENGINE-2)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors

3. Job Set-up
Subtask 36-11-49-861-140-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 36-11-49-941-160-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred for not less than five minutes before you do this procedure.
(2) 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)
Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.

(3) On ENG 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 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 36-11-49-865-253-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
FOR FIN: 1000EM2 (ENGINE2)
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-010-317-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors:
(a) FOR [1000EM1] (ENGINE-1)

437AL and 438AR (Ref. AMM TASK 71-13-00-010-040).

(b) FOR [1000EM2] (ENGINE-2)

447AL and 448AR (Ref. AMM TASK 71-13-00-010-040).

Subtask 36-11-49-040-195-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser (T/R) System

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) Make the T/R unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041).

Subtask 36-11-49-010-318-A ** ON A/C NOT FOR ALL

F. Get Access
(1) FOR [1000EM1] (ENGINE-1)

451AL and 452AR (Ref. AMM TASK 78-36-00-010-040).

(2) FOR [1000EM2] (ENGINE-2)

461AL and 462AR (Ref. AMM TASK 78-36-00-010-040).

(3) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

4. Procedure
Subtask 36-11-49-020-175-A ** ON A/C NOT FOR ALL

A. Removal of the Upper HP Duct Links

Upper HP Duct-Links ** ON A/C NOT FOR ALL

(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) Remove the nuts (1), washers (4) and bolts (5) that attach the links (2) and (3) to the upper HP duct assembly.
(4) Remove the nuts (10), washers (8), bolts (9) and bushings (7) that attach the links (2) and (3) to the brackets (6) and (12) on engine flange STA. 233 and STA. 239.

Subtask 36-11-49-020-176-A ** ON A/C NOT FOR ALL

B. Removal of the Mid Stage T-Duct Assembly Links

Mid-Stage T-Duct Links ** ON A/C NOT FOR ALL

(1) Remove the nuts (1), bolts (3) and washers (2) from the links (4) and (5) that connect to the Mid Stage T-Duct.
(2) Remove the nuts (6), bolts (10), washers (9) and bushings (8). Remove the links (4) and (5) from the brackets (7) and (12) on the engine flange STA. 215.

[Rev.10 from 2021] 2026.04.01 01:10:21 UTC