W DOC AIRBUS | TSM A320F

Downstream High Pressure Failure on Channel B

TASK 30-21-00-810-828-A
Downstream High Pressure Failure on Channel B

1. Possible Causes
  • NACELLE ANTI-ICE LOWER VALVE AND ATTACHMENT HARDWARE [4011DN]
  • PRESS XDCR-ENGINE AIR INTAKE ANTI ICE, 1 [4002DN]
  • W03 HARNESS [4087KS]
  • [4000KS]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
PLIERS - JAWED, SOFT
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 30-21-22-000-801
Removal of the Nacelle Anti-Ice Core-Pressure-Transducer
AMM 30-21-22-400-801
Installation of the Nacelle Anti-Ice Core-Pressure-Transducer
AMM 30-21-51-000-803
Removal of the Lower Anti-Ice Valve
AMM 30-21-51-400-803
Installation of the Lower Anti-Ice Valve
AMM 71-13-00-010-802
Opening of the Fan Cowl Doors
AWM 715134
AMM 73-21-01-000-801
Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801
Installation of the Electronic Engine Control (EEC)
AMM 73-21-63-000-802
Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802
Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 78-36-00-410-802
Closing of the Thrust Reverser Cowl-Doors
3. Fault Confirmation
Subtask 30-21-00-730-065-A ** ON A/C NOT FOR ALL
A. Test
   (1) Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
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 WARNING, INJURY CAN OCCUR.
CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.
Subtask 30-21-00-810-077-A ** ON A/C NOT FOR ALL
A. Do the steps that follow:
   (1) Open the right fan cowl door AMM 71-13-00-010-802.
   (2) If the fault continues:
  • Disconnect electrical connectors P20 from the core pressure transducer (4002DN).
  • Do a visual inspection of electrical receptacle J20 of the core pressure transducer for bent pins, contamination, corrosion or visual signs of damage.
     (a) If you find damage on the receptacle J20:
     (b) If you find no damage on the receptacle J20:
  • Do a visual inspection on the electrical connector P20 of the W03 harness for bent pins, contamination, corrosion or visual signs of damage.
       1 If you find damage on receptacle P20:
       2 If you find no damage on receptacle J20 and on electrical connector P20:
  • Do a resistance check AWM 715134 between:
    * Pin J20/9 and pin J20/8 of the NAI core pressure transducer (4002DN)
    * Pin J20/7 and pin J20/6 of the NAI core pressure transducer (4002DN).
         a If the resistance is more than 12.5 kohm:
         b If the resistance is less than 12.5 kohm:
  • Use PLIERS - JAWED, SOFT to disconnect electrical connector P14 of the EEC.
  • Do a visual inspection on electrical connector P14 of the W03 harness for bent pins, contamination, corrosion or visual signs of damage.
         c If you find damage on electrical connector P14:
   (3) If the fault continues:
5. Close-up
Subtask 30-21-00-942-069-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Make sure that the work area is clean and clear of tools and other items.
     (a) Close the right thrust-reverser cowl-door AMM 78-36-00-410-802.
[Rev.8 from Aug 2018] 2026.04.04 04:29:33 UTC
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