W DOC AIRBUS | TSM A320F

APU Bleed Pressure - Intense Pressure Fluctuation (131-9(A))

TASK 49-00-81-810-886-A
APU Bleed Pressure - Intense Pressure Fluctuation (131-9(A))

1. Possible Causes
  • P2 FLOW CTL VALVE [8HB]
  • P1 FLOW CTL VALVE [11HB]
  • FLOW CTL UNIT - PACK 1 [23HB]
  • FLOW CTL UNIT - PACK 2 [24HB]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 49-00-81-810-891-A
No APU Bleed-Air Pressure, Low or Fluctuating APU Bleed-Air Pressure (with AIDS Support) (131-9)(A))
AMM 21-51-51-000-001
Removal of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 21-51-51-400-001
Installation of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 49-00-00-860-008
APU Start by External Power
3. Fault Confirmation
Subtask 49-00-81-710-222-A ** ON A/C NOT FOR ALL
A. Test
NOTE: The Fault can be spurious and is not necessarily reproductive on ground.
   (1) Start and operate the APU AMM 49-00-00-860-008.
   (2) On the AIR COND section on the overhead panel 30VU, push the
  • APU BLEED p/bsw to on;
  • PACK 1 p/bsw to on (the OFF legend is off);
  • PACK 2 p/bsw to on (the OFF legend is off);
4. Fault Isolation
Subtask 49-00-81-810-151-A ** ON A/C NOT FOR ALL
A. If the bleed indication on the ECAM APU page shows pressure fluctuation:
  • switch to the ECAM BLEED page and observe the pack-flow indication needles.
   (1) If one of them shows periodic cycling (low frequency, high amplitude):
   (2) If the indication is OK:
Subtask 49-00-81-810-151-B ** ON A/C NOT FOR ALL
A. If the bleed indication on the ECAM APU page shows pressure fluctuation:
  • Get the ECAM BLEED page and monitor the pack-flow indication needles.
   (1) If one of them shows cycling at intervals (low frequency, high amplitude):
   (2) If the indication is correct:
Subtask 49-00-81-710-223-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:38 UTC
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