Removal of the Indicating Tubes on the Environmental Control System (ECS) Ducts

TASK 36-11-49-000-831-A
Removal of the Indicating Tubes on 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 PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

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 1M(3 FT)
No specific	AR	CAP - PROTECTION
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, ENGINE 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 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 36-11-49-000-827-A	Removal of the Environmental Control System (ECS) Ducts from the Engine Case Ports to the Pylon Connections
TASK 36-11-52-000-804-A	Removal of the Bleed-Pressure Regulator Valve (PRV)
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 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Indicating Tubes on the Environmental Control System (ECS) Duct

3. Job Set-up
Subtask 36-11-49-861-118-A

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

Subtask 36-11-49-941-137-A

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 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.
(3) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(4) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(5) On 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 36-11-49-865-209-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C 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 36-11-49-010-244-A

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 36-11-49-040-163-A

E. 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 nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 36-11-49-010-245-A

F. Get Access
(1) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 36-11-49-020-149-A

A. Removal of the Indicating Tubes on the 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).

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

(2) Make sure that you wait for a minimum of 5 minutes until there is no pressure in the bleed-air duct system.

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

(3) In the cockpit, on the SD bleed page:
(a) Make sure that the temperature of the bleed-air duct system are in the ambient conditions.
PRE SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and PRE SB BD70CR36-041 & PRE SPOL BD-EBU-20003
(4) Remove the indicating tube (4) as follows:
(a) Disconnect the indicating tube (4) from the ECS Y-duct (23).
(b) Disconnect the indicating tube (4) from the pylon (22).
(c) Remove the bolts (13) and (16) that attach the P-clamps (12) and (20) to the support brackets (21) and (19).
(d) Remove the bolt (2) that attaches the P-clamp (3) to the support bracket (28) on the ECS duct (6).
(e) Remove the indicating tube (4) from the engine.
(f) Record the position and the location of the P-clamps (3), (12) and (20) on the indicating tube (4) for the installation procedure.
(g) Remove the P-clamps (3), (12) and (20) from the indicating tube (4).
(h) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
End of PRE SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and PRE SB BD70CR36-041 & PRE SPOL BD-EBU-20003

POST SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and POST SB BD70CR36-041 & POST SPOL BD-EBU-20003
(5) Remove the indicating tube (4) as follows:
(a) Disconnect the indicating tube (4) from the ECS Y-duct (23).
(b) Disconnect the indicating tube (4) from the flex tube (44).
(c) Remove the bolts (13) and (16) that attach the P-clamps (12) and (20) to the support brackets (21) and (19).
(d) Remove the bolt (2) that attaches the P-clamp (3) to the support bracket (28) on the ECS duct (6).
(e) Remove the indicating tube (4) from the engine.
(f) Record the position and location of the P-clamps (3), (12) and (20) on the indicating tube (4) for the installation procedure.
(g) Remove the P-clamps (3), (12) and (20) from the indicating tube (4).
(h) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
(6) Remove the flex tube (44) as follows:
(a) Disconnect the flex tube (44) from the pylon (22).
(b) Remove the flex tube (44) from the engine.
(c) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
End of POST SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and POST SB BD70CR36-041 & POST SPOL BD-EBU-20003

PRE SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and PRE SB BD70CR36-041 & PRE SPOL BD-EBU-20003
(7) Remove the indicating tube (8) as follows:
(a) Disconnect the indicating tube (8) from the ECS duct (6).
(b) Disconnect the indicating tube (8) from the pylon (22).
(c) Remove the bolts (14) and (17) that attach the P-clamps (15) and (18) to the support brackets (21) and (19).
(d) Remove the indicating tube (8) from the engine.
(e) Record the position and location of the P-clamps (15) and (18) on the indicating tube (8) for the installation procedure.
(f) Remove the P-clamps (15) and (18) from the indicating tube (8).
(g) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
End of PRE SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and PRE SB BD70CR36-041 & PRE SPOL BD-EBU-20003

POST SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and POST SB BD70CR36-041 & POST SPOL BD-EBU-20003
(8) Remove the indicating tube (8) as follows:
(a) Disconnect the indicating tube (8) from the ECS duct (6).
(b) Disconnect the indicating tube (8) from the flex tube (45).
(c) Remove the bolts (14) and (17) that attach the P-clamps (15) and (18) to the support brackets (21) and (19).
(d) Remove the indicating tube (8) from the engine.
(e) Record the position and the location of the P-clamps (15) and (18) on the indicating tube (8) for the installation procedure.
(f) Remove the P-clamps (15) and (18) from the indicating tube (8).
(g) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
(9) Remove the flex tube (45) as follows:
(a) Disconnect the flex tube (45) from the pylon (22).
(b) Remove the flex tube (45) from the engine.
(c) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
End of POST SPOL BD-EBU-20001 & SPOL BD-EBU-20002 and POST SB BD70CR36-041 & POST SPOL BD-EBU-20003
(10) Remove the support bracket (21) as follows:
(a) Remove the bolts (37) that attach the support bracket (21).
(b) Remove the support bracket (21) from the engine.
PRE SPOL BD-EBU-17003 & PRE SB BD70CR36-026
(11) Remove the support bracket (19) as follows:
(a) Remove the harness (34) from the spring clip on the support bracket (19).
(b) Remove the bolt (36) and the P-clamp (35) from the flange (32).
(c) Remove the bolts (38) that attach the support bracket (19).
(d) Remove the support bracket (19) together with the flange (32) from the engine.
(e) Remove the bolts (33) to remove the flange (32) from the support bracket (19).
(f) Safety the flange (32). It is necessary for the installation procedure.
End of PRE SPOL BD-EBU-17003 & PRE SB BD70CR36-026
POST SPOL BD-EBU-17003 & POST SB BD70CR36-026
(12) Remove the support bracket (19) as follows:
(a) Remove the bolts (33) that attach the support bracket (19) and the flange (39).
(b) Remove the support bracket (19) from the engine.
(c) Safety the flange (39) in its position with the zip-ties temporarily.
End of POST SPOL BD-EBU-17003 & POST SB BD70CR36-026
(13) Remove the indicating tube (7) as follows:
(a) Disconnect the indicating tube (7) from the ECS duct (6).
(b) Disconnect the indicating tube (7) from the Pressure Regulating Valve (PRV) (5).
(c) If necessary, remove the PRV (5) to get access to the indicating tube (7) (Ref. AMM TASK 36-11-52-000-804).
(d) Remove the bolt (1) that attaches the P-clamp (9) to the support bracket (28) on the ECS duct (6).
(e) Remove the bolt (29) that attaches the support bracket (28) to the ECS duct (6).
(f) Remove the support bracket (28) from the engine.
(g) Remove the indicating tube (7) from the engine.
(h) Record the position and location of the P-clamp (9) on the indicating tube (7) for the installation procedure.
(i) Remove the P-clamp (9) from the indicating tube (7).
(j) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
PRE SPOL BD-EBU-18003 AND PRE SB BD70CR36-036
(14) Remove the indicating tube (10) as follows:
(a) Disconnect the indicating tube (10) from the High Pressure Valve (HPV) (24).
(b) Disconnect the indicating tube (10) from the ECS Y-duct (23).
(c) Remove the bolt (27) that attaches the P-clamp (26) to the support bracket (25).
(d) If necessary, remove the ECS Y-duct (23) to get access to the indicating tube (10) (Ref. AMM TASK 36-11-49-000-827).
(e) Remove the indicating tube (10) from the engine.
(f) Record the position and the location of the P-clamp (26) on the indicating tube (10) for the installation procedure.
(g) Remove the P-clamp (26) from the indicating tube (10).
(h) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
End of PRE SPOL BD-EBU-18003 AND PRE SB BD70CR36-036
POST SPOL BD-EBU-18003 AND POST SB BD70CR36-036
(15) Remove the indicating tube (10) as follows:
(a) Disconnect the indicating tube (10) from the HPV (24).
(b) Disconnect the indicating tube (10) from the ECS Y-duct (23).
(c) Remove the bolt (40) that attaches the P-clamp (26) to the support bracket (43).
(d) Remove the indicating tube (10) from the engine.
(e) Record the position and the location of the P-clamp (26) on the indicating tube (10) for the installation procedure.
(f) Remove the P-clamp (26) from the indicating tube (10).
(g) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.
(h) Remove the bolt (27) from the support bracket (25).
(i) If necessary, remove the ECS Y-duct (23) to get access to the bolt (27) (Ref. AMM TASK 36-11-49-000-827).
End of POST SPOL BD-EBU-18003 AND POST SB BD70CR36-036

[Rev.10 from 2021] 2026.04.01 12:38:43 UTC