W DOC AIRBUS | TSM A320F

Cabin Recirculation Fault (Fan 1 / Supply)

TASK 21-21-00-810-801-A
Cabin Recirculation Fault (Fan 1 / Supply)

1. Possible Causes
  • RECIRC FILTER CARTRIDGE 1 [4012HM]
  • P/BSW-VENTILATION/CAB FANS [4HG]
  • RELAY-FAN FAULT SUPPRESS [16HG]
  • RELAY-L FAN POWER [5HG]
  • RELAY-L FAN CONTROL [7HG]
  • RELAY-L FAN FAULT [10HG]
  • RECIRC FAN 1 [15HG]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-21-00-710-001
Operational Test of the Cabin Recirculation Fans
ASM 212101
AMM 21-21-41-000-001
Removal of the Recirculation Filter
AMM 21-21-41-400-001
Installation of the Recirculation Filter
AMM 21-21-51-000-001
Removal of the Cabin Recirculation Fans
AMM 21-21-51-400-001
Installation of the Cabin Recirculation Fans
ASM 216301
3. Fault Confirmation
Subtask 21-21-00-710-050-A
A. Do the operational test of the cabin recirculation fans 14HG and 15HG AMM 21-21-00-710-001.
4. Fault Isolation
Subtask 21-21-00-810-050-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message RECIRC FAN 1 OR SPLY:
  • make sure that the recirculation filter (4012HM) housing and the adjacent area is clean.
  • remove the RECIRC FILTER CARTRIDGE 1 [4012HM] AMM 21-21-41-000-001.
   (1) If the recirculation fan (15HG) operates correctly:
  • do a check of the recirculation filter (4012HM) for contamination.
     (a) If the filter is clogged:
     (b) If the filter is not clogged:
   (2) If the recirculation fan (15HG) does not operate:
  • do a check of the P/BSW-VENTILATION/CAB FANS [4HG] and replace it if necessary ASM 212101.
     (a) If the fault continues:
  • do a check of the RELAY-FAN FAULT SUPPRESS [16HG] and replace it if necessary ASM 212101.
     (b) If the fault continues:
  • do a check of the RELAY-L FAN POWER [5HG] and replace it if necessary ASM 212101.
     (c) If the fault continues:
  • do a check of the RELAY-L FAN CONTROL [7HG] and replace it if necessary ASM 212101.
     (d) If the fault continues:
  • do a check of the RELAY-L FAN FAULT [10HG] and replace it if necessary ASM 212101.
     (e) If the fault continues:
     (f) If the fault continues:
  • do a check and repair the wiring ASM 212101 and ASM 216301 from:
  • the FAN (15HG) to the CB (1HG),
  • the FAN (15HG) to the CB (2HG),
  • the FAN (15HG) to ground,
  • the RELAY (7HG) to the RELAY (5HG),
  • the RELAY (7HG) to ground,
  • the RELAY (10HG) to the RELAY (5HG),
  • the RELAY (10HG) to ground,
  • the RELAY (10HG) to the ZC (8HK),
  • the RELAY (16HG) to the SW (4HG) and,
  • the RELAY (16HG) to ground.
Subtask 21-21-00-810-050-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message RECIRC FAN 1 OR SPLY(15HG):
  • make sure that the recirculation filter (4012HM) housing and the adjacent area is clean.
  • remove the RECIRC FILTER CARTRIDGE 1 [4012HM] AMM 21-21-41-000-001.
   (1) If the recirculation fan (15HG) operates correctly:
  • do a check of the recirculation filter (4012HM) for contamination.
     (a) If the filter is clogged:
     (b) If the filter is not clogged:
   (2) If the recirculation fan (15HG) does not operate:
  • do a check of the P/BSW-VENTILATION/CAB FANS [4HG] and replace it if necessary ASM 212101.
     (a) If the fault continues:
  • do a check of the RELAY-FAN FAULT SUPPRESS [16HG] and replace it if necessary ASM 212101.
     (b) If the fault continues:
  • do a check of the RELAY-L FAN POWER [5HG] and replace it if necessary ASM 212101.
     (c) If the fault continues:
  • do a check of the RELAY-L FAN CONTROL [7HG] and replace it if necessary ASM 212101.
     (d) If the fault continues:
  • do a check of the RELAY-L FAN FAULT [10HG] and replace it if necessary ASM 212101.
     (e) If the fault continues:
     (f) If the fault continues:
  • do a check and repair the wiring ASM 212101 and ASM 216301 from:
  • the FAN (15HG) to the CB (1HG),
  • the FAN (15HG) to the CB (2HG),
  • the FAN (15HG) to ground,
  • the RELAY (7HG) to the RELAY (5HG),
  • the RELAY (7HG) to ground,
  • the RELAY (10HG) to the RELAY (5HG),
  • the RELAY (10HG) to ground,
  • the RELAY (10HG) to the ACSC1 (47HH),
  • the RELAY (16HG) to the SW (4HG) and,
  • the RELAY (16HG) to ground.
Subtask 21-21-00-710-051-A
B. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-21-00-860-050-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:24:35 UTC
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