Removal of the Environmental Control System (ECS) Ducts

TASK 36-11-49-000-822-A
Removal of the Environmental Control System (ECS) Ducts

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 AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

ZONE: 454
ZONE: 464

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
454	HOT SECTION
464	HOT SECTION
191DB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 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 30-21-49-000-807-A	Removal of the Nacelle Anti-Ice (NAI) Duct
TASK 36-11-41-000-802-A	Removal of the Environmental Control System (ECS) Mid-Y Duct and the Intermediate Pressure Check Valve (IPCV)
TASK 36-11-49-000-823-A	Removal of the Environmental Control System (ECS) Sense Lines
TASK 36-11-51-000-802-A	Removal of the HP Bleed Valve (HPV)
TASK 36-11-52-000-802-A	Removal of the Bleed Pressure-Regulator Valve
TASK 36-11-61-000-801-A	Removal of the Environmental Control System (ECS) Harness
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 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Environmental Control System (ECS) Ducts
Starter Duct

3. Job Set-up
Subtask 36-11-49-861-110-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 36-11-49-941-129-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(2) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(3) On the access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

Subtask 36-11-49-865-186-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
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-49-010-219-A ** ON A/C NOT FOR ALL

D. 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 36-11-49-040-151-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser 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 78-30-00-040-805).

Subtask 36-11-49-010-220-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the fan cowl doors.

4. Procedure
Subtask 36-11-49-020-142-A ** ON A/C NOT FOR ALL

A. Removal of the Environmental Control System (ECS) Ducts
(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).

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(3) Remove the ECS harness from the ECS ducts, the Pressure Regulating Valve (PRV) and the HP Bleed Valve (HPV) (Ref. AMM TASK 36-11-61-000-801).
(4) Remove the IDG EDP harness from the spring clip on the ECS LP duct (27).
(5) Remove the ECS sense lines from the ECS ducts, the PRV and the HPV (Ref. AMM TASK 36-11-49-000-823).
(6) Remove the intermediate pressure check-valve, the mid-Y duct (25), the V-band couplings (7) and the seals (8) from the ECS LP duct (27), the PRV and the HPV (Ref. AMM TASK 36-11-41-000-802).
(7) Remove the PRV,the V-band couplings (7) and the seals (8) from the ECS starter duct (9) (Ref. AMM TASK 36-11-52-000-802).
(8) Remove the HPV, the V-band couplings (7) and the seals (8) from the ECS HP duct (26) (Ref. AMM TASK 36-11-51-000-802).
(9) Remove the component cooling tube from the ECS starter duct (9):
(a) Remove the bolt (1) and the washer (2) that attach the component cooling tube and the clamp to the ECS starter duct (9):
1 Do not remove the clamp from the component cooling tube.
(b) Remove the bolt (3) and the washer (4) that attach the component cooling tube and the clamp to the ECS starter duct (9):
1 Do not remove the clamp from the component cooling tube.
(c) Remove the bolt (5) and the washer (6) that attach the component cooling tube and the clamp to the ECS starter duct (9):
1 Do not remove the clamp from the component cooling tube.
(10) Remove the ECS ducts as follows:
(a) Remove the ECS starter duct (9) as follows:
1 Remove the upper V-band couplings (7) that attaches the ECS starter duct (9) to the Overpressure Valve (OPV).
2 Remove the lower V-band couplings (7) that attaches the ECS starter duct (9) to the Starter Air Valve (SAV).
3 Remove the bolt (10), washers (11), bushing (12) and nut (13) that attach the ECS starter duct (9) to the link assembly.
4 Remove the bolt (17), washers (15), bushing (16) and nut (14) that attach the ECS starter duct (9) to the link assembly.
5 Remove the bolt (18), washers (19), bushing (20) and nut (21) that attach the ECS starter duct (9) to the link assembly.
6 Remove the ECS starter duct (9) from the OPV and the SAV.
7 Remove and discard the seals (8).
8 Remove the nut (22), the washer (23) and the union (24) from the ECS starter duct (9).
(b) Remove the ECS LP duct (27) as follows:
1 Remove the bolts (52) and the washers (53) that attach the ECS LP duct (27) to the heatshield bracket.
2 Remove the V-band couplings (29) that attach the ECS LP duct (27) to the engine.
3 Remove the ECS LP duct (27) from the engine.
4 Remove and discard the seals (28).
(c) Remove the ECS HP duct (26) as follows:
1 Remove the anti-ice sense tubes from the ECS HP duct (26) (Ref. AMM TASK 30-21-49-000-807).
2 Remove the bolt (38), washers (36), bushing (37) and nut (35) that attach the ECS HP duct (26) to the link assembly.
3 Remove the bolt (39), washers (40), bushing (41) and nut (42) that attach the ECS HP duct (26) to the link assembly.
4 Remove the V-band couplings (34) that attach the ECS HP duct (26) to the venturis (50).
5 Remove the ECS HP duct (26) from the engine.
6 Remove and discard the seals (33).
7 Remove the nuts (30), the washers (31) and the unions (32) from the ECS HP duct (26).
8 Remove the bolts (46), washers (44), bushings (45) and nuts (43) that attach the link assembly (47) to the ECS HP duct (26).
9 Remove the link assembly (47) from the ECS HP duct (26).
(d) Remove the venturis (50) as follows:

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.

1 Remove and discard the safety cable from the 15 bolts (49).
2 Remove the bolts (49) and the washers (48) that attach the venturis (50) to the engine.
3 Remove the venturis (50) from the engine.
4 Remove and discard the seals (51).

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(e) Make sure that you install all the necessary COVER - PROTECTION to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 01:11:21 UTC