W DOC AIRBUS | TSM A320F

Pack 1 Turbine Bypass Valve Fault

TASK 21-61-00-810-816-A
Pack 1 Turbine Bypass Valve Fault

1. Possible Causes
  • VALVE-TURBINE BYPASS [10HH]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-61-00-710-001
Operational Test of the Pack Temperature-Control System
ASM 216104
AMM 21-61-53-000-001
Removal of the Turbine Bypass Valve
AMM 21-61-53-400-001
Installation of the Turbine Bypass Valve
3. Fault Confirmation
Subtask 21-61-00-710-080-A ** ON A/C NOT FOR ALL
A. Do the operational test of the pack temperature-control system AMM 21-61-00-710-001.
NOTE: If a fault is detected, the PC gives a fault code for shop maintenance in addition to the related CFDS message(s) (refer to TSM chapter 21-63-00, page block 301).
Subtask 21-61-00-710-080-B ** ON A/C NOT FOR ALL
A. Do the operational test of the pack temperature-control system AMM 21-61-00-710-001.
4. Fault Isolation
Subtask 21-61-00-810-098-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message TEST OK, but the POST FLIGHT REPORT and/or the PREVIOUS LEG REPORT gives the maintenance message P1 BYPASS VALVE:
  • no further maintenance action is necessary.
NOTE: If it is reported that a bypass valve fault has ocurred several times in flight:
Subtask 21-61-00-810-099-B ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message P1 BYPASS VALVE:
   (1) If the fault continues:
  • do a check and repair the wiring ASM 216104 from:
  • the VALVE (10HH) to the PC 1 (7HH) and,
  • the VALVE (10HH) to ground.
Subtask 21-61-00-810-098-B ** ON A/C NOT FOR ALL
C. If the test gives the maintenance message TEST OK, but the POST FLIGHT REPORT and/or the PREVIOUS LEG REPORT gives the maintenance message P1 BY PASS VALVE(10HH):
  • no further maintenance action is necessary.
NOTE: If it is reported that a bypass valve fault has ocurred several times in flight:
Subtask 21-61-00-810-099-C ** ON A/C NOT FOR ALL
D. If the test gives the maintenance message P1 BY PASS VALVE(10HH):
   (1) If the fault continues:
  • do a check and repair the wiring ASM 216104 from:
  • the VALVE (10HH) to the ACSC1 (47HH) and,
  • the VALVE (10HH) to ground.
Subtask 21-61-00-710-081-A
E. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-61-00-860-065-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:24:53 UTC
"WTRUIB" 2025