Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Fan Air-Valve Actuator

TASK 36-11-49-000-829-A
Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Fan Air-Valve Actuator

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: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

ZONE: 410
ZONE: 420
ZONE: 472
ZONE: 482

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)
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L12003001000	1	HARNESS,SAFETY

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
472	PYLON LEADING EDGE
482	PYLON LEADING EDGE
191DB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413ET, 415AL, 415AR, 437AL, 438AR, 451AL, 452AR, 472AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423ET, 424DR, 425AL, 425AR, 447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-00-00-481-002-A	Installation of the Wingrip
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 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
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 54-51-21-000-802-A	Removal of the Pylon Lateral Access-Doors
TASK 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
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
Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Fan Air-Valve Actuator

3. Job Set-up
Subtask 36-11-49-861-121-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-49-941-139-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 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) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(4) 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.
(5) On FLAPS panel 114VU:

Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
Put a WARNING NOTICE(S) in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.

(6) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).

Subtask 36-11-49-865-219-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: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-49-010-257-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the pylon access panels.
(2) Remove these access doors (Ref. AMM TASK 54-53-11-000-804):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413ET 472AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423ET 424DR

4. Procedure
Subtask 36-11-49-020-151-A ** ON A/C NOT FOR ALL

A. Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Pylon Interface

NOTE: To remove sense line (5), you have to remove the sense line (3) from the pylon first.

(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) Loosen the union nut (2) of the sense line (3).
(4) Disconnect the sense line (3) from the bleed-air precooler exchanger (1).
(5) Loosen the union nut (4) of the sense line (3).
(6) Disconnect the sense line (3) from the sense line (5) and remove it from the pylon.
(7) Remove the two bolts (8) and the washers (7) from the sense line (5).

NOTE: This step is applicable only if you remove the sense line (5).

(8) Put a PLUG - BLANKING on the port of the bleed-air precooler exchanger (1).
(9) Put the PLUG-BLANKING in each disconnected line end.
(10) Remove the access platform(s).

Subtask 36-11-49-010-252-A ** ON A/C NOT FOR ALL

B. 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 36-11-49-040-167-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System 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 36-11-49-010-256-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 2M (6 FT) in position.
(3) Remove these access doors (Ref. AMM TASK 54-51-21-000-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
415AL 415AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
425AL 425AR

Subtask 36-11-49-020-153-A ** ON A/C NOT FOR ALL

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

E. Removal of the Sense Line between the Pylon Interface and the Fan Air-Valve Actuator

NOTE: You must remove the sense line (3) of the pylon before you remove the sense line (5) from the pylon.

(1) Loosen the union nut (9) of the sense line (5).
(2) Remove the two nuts (14) and washers (13) from the clamp (12).
(3) Disconnect the sense line (5) from the fan air-valve actuator (10).
(4) Remove the clamp (12) from the support (11) and the sense line (5).
(a) Make sure that you also remove the protective parts when you remove the clamp (12).
(5) Disconnect the sense line (5) from the pylon interface (6).
(6) Remove the sense line (5) from the pylon.
(7) Put a PLUG - BLANKING on the port of the fan air-valve actuator (10).
(8) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 01:11:35 UTC