W DOC AIRBUS | AMM A320F

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

TASK 36-11-49-000-833-A
Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Upstream) 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 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.
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
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 4M (13 FT)-ADJUSTABLE
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
No specific
1
WRENCH - STANDARD
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
191DB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
413CT, 414BR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
423CT, 424BR
 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 54-52-11-000-807-A
Removal of the Access Skin Panels
F Sense Line between the Bleed-Air Precooler Exchanger (Upstream) and the Bleed Differential Pressure-Transducer
3. Job Set-up
Subtask 36-11-49-861-129-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 36-11-49-941-148-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.
   (6) 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.
   (7) 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 36-11-49-865-231-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
49VUAIR BLEED/ENG 1/CTL2HA1D11
122VUAIR BLEED/ENG 1/MONG3HA1Z23
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
49VUAIR BLEED/ENG 2/MONG3HA2D12
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-11-49-010-280-A
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 54-52-11-000-807):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
413CT 414BR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
423CT 424BR
4. Procedure
Subtask 36-11-49-020-160-A
A. Removal of the Sense Line between the Bleed-Air Precooler Exchanger (Upstream) and the Bleed Differential Pressure-Transducer
   (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) Remove the bolts (6) and washers (5) from the clamps (7).
   (4) Remove the clamps (7) from the supports (4) and the sense line (1).
   (5) Disconnect the gimbal grommet (10) from the gimbal grommet (8).
   (6) Loosen the union nut (2) of the sense line (1).
   (7) Disconnect the sense line (1) from the bleed-air precooler exchanger (3).
   (8) Loosen the union nut (12) of the sense line (1):
CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.
     (a) Use a second WRENCH - STANDARD to hold the bleed differential pressure-transducer (11) when you loosen the union nut (12).
   (9) Disconnect the sense line (1) from the bleed differential pressure-transducer (11).
   (10) Remove the gimbal grommets (10) and (8) from the sense line (1).
   (11) Disengage the sense line (1) from the hole of the support (9).
   (12) Remove the sense line (1) from the pylon.
   (13) Put a PLUG - BLANKING on the ports of the bleed-air precooler exchanger (3) and the bleed differential pressure-transducer (11).
   (14) Put the PLUG-BLANKING in each disconnected line end.
[Rev.10 from 2021] 2026.04.01 01:11:51 UTC
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