W DOC AIRBUS | AMM A320F

Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Bleed Differential Pressure-Transducer

TASK 36-11-49-000-828-A
Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Bleed Differential Pressure-Transducer

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: 413
ZONE: 423
ZONE: 471
ZONE: 481
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
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
413
UPPER FWD PYLON
423
UPPER FWD PYLON
471
PYLON LEADING EDGE
481
PYLON LEADING EDGE
191DB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AL, 413AT, 413BL, 413CL, 413DL, 413ET
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AL, 423AT, 423BL, 423CL, 423ET, 481AL
 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 36-11-18-000-801-A
Removal of the Bleed Differential Pressure-Transducer
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 54-52-11-000-805-A
Removal of the Access Skin Panels
TASK 54-52-82-000-801-A
Removal of the Strips
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
F Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Bleed Differential Pressure-Transducer
3. Job Set-up
Subtask 36-11-49-861-119-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 36-11-49-941-138-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) 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 36-11-49-865-216-A ** ON A/C NOT FOR ALL
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VUAIR BLEED/ENG 2/MONG3HA2D12
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-49-010-250-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position at the pylon access panels.
   (2) Remove these access panels (Ref. AMM TASK 54-52-11-000-805) and (Ref. AMM TASK 54-53-11-000-804):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AL 413BL 413CL 413DL 413AT 413ET
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AL 423BL 423CL 423AT 423ET 481AL
Subtask 36-11-49-010-265-A ** ON A/C NOT FOR ALL
E. Removal of Components
   (1) Remove the strips on the Rib 4, Rib 6 and Rib 7 on the left side of the pylon (Ref. AMM TASK 54-52-82-000-801).
4. Procedure
Subtask 36-11-49-020-150-A ** ON A/C NOT FOR ALL
A. Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Downstream) and the Pylon Interface
   (1) If you use the APU to energize the electrical circuits, stop the APU:
   (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 (23) of the sense line (2).
   (4) Disconnect the sense line (2) from the bleed-air precooler exchanger (24).
   (5) Loosen the union nut (7) of the sense line (2).
   (6) Disconnect the sense line (2) from the sense line (1).
   (7) Remove the bolt (13) and washer (12) from the clamp (11).
   (8) Remove the clamp (11) from the support (10) and the sense line (2).
   (9) Remove the two bolts (17) and washers (16) from the clamp (15).
   (10) Remove the first part of the clamp (15) from the second part of the clamp (15).
   (11) Disengage the sense line (2) from the second part of the clamp (15).
     (a) Make sure that the second part of the clamp (15) stays in the support (14).
   (12) Remove the two bolts (18), the washers (19) and the nuts (21) from the clamp (20).
   (13) Remove the first part of the clamp (20) from the second part of the clamp (20).
   (14) Remove the sense line (2) from the pylon.
   (15) Remove the bushing (22) from the sense line (2).
   (16) Put a PLUG - BLANKING on the port of the bleed-air precooler exchanger (24).
   (17) Put the PLUG-BLANKING in each disconnected line end.
Subtask 36-11-49-020-155-A ** ON A/C NOT FOR ALL
B. Removal of the Sense Line between the Pylon Interface and the Bleed Differential Pressure-Transducer
CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.
   (1) To make the removal of the sense line (1) easier, remove the pressure transducer (3) (Ref. AMM TASK 36-11-18-000-801).
   (2) Loosen the union nut (7) of the sense line (2).
NOTE: This step is only applicable if the sense line (2) is not removed.
   (3) Remove the two bolts (8), washers (9) and nuts (5).
   (4) Put the PLUG-BLANKING in each disconnected line end.
[Rev.10 from 2021] 2026.04.01 01:11:32 UTC
"Aviabrain" 2025