W DOC AIRBUS | TSM A320F

Skin Air Inlet and Outlet Valve Cycling on Ground

TASK 21-26-00-810-838-A
Skin Air Inlet and Outlet Valve Cycling on Ground

1. Possible Causes
  • SENSOR-SKIN TEMP, AVNCS VENT [28HQ]
  • AEVC [10HQ]
  • aircraft wiring
  • EIU-1 [1KS1]
  • EIU-2 [1KS2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 212601
ASM 212602
AMM 21-26-13-000-001
Removal of the Avionics Ventilation Skin Temperature Sensor
AMM 21-26-13-400-001
Installation of the Avionics Ventilation Skin Temperature Sensor
AMM 21-26-34-000-001
Removal of the Avionics Equipment Ventilation Computer (AEVC)
AMM 21-26-34-400-001
Installation of the Avionics Equipment Ventilation Computer (AEVC)
ASM 326201
ASM 326202
ASM 732509
AMM 73-25-34-000-040
Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-000-802
Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040
Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-400-802
Installation of the Engine Interface Unit (EIU)
3. Fault Confirmation
Subtask 21-26-00-700-051-A
A. Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
Subtask 21-26-00-810-092-A ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the crew observation:
Skin Air Valves cycling on ground:
   (1) If the fault continues:
   (2) If the fault continues:
  • do a check of the aircraft wiring between the avionics-ventilation skin temperature-sensor and the AEVC [10HQ] ASM 212602.
     (a) If the wiring is not ok:
  • repair it.
     (b) If the wiring is ok:
  • do a check of the aircraft wiring ASM 732509 between:
    . the AEVC pin AB/10A and the EIU 1 (1KS1) pin AB/1G,
    . the AEVC pin AB/11A and the EIU 2 (1KS2) pin AB/1G.
       1 If the wiring is not ok:
  • repair it.
       2 If the wiring is ok:
       3 If the fault continues:
  • do a check of the aircraft wiring between the LGCIU 1 (5GA1) pin AB/1D and the AEVC pin AB/9C ASM 212601 and ASM 326201.
         a If the wiring is not ok:
  • repair it.
         b If the wiring is ok:
  • do a check and repair the aircraft wiring between the LGCIU 2 (5GA2) pin AB/1D and the AEVC pin AB/10C ASM 212601 and ASM 326202.
Subtask 21-26-00-810-092-C ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the crew observation:
Skin Air Valves cycling on ground:
   (1) If the fault continues:
   (2) If the fault continues:
  • do a check of the aircraft wiring between the avionics-ventilation skin temperature-sensor and the AEVC [10HQ] ASM 212602.
     (a) If the wiring is not ok:
  • repair it.
     (b) If the wiring is ok:
  • do a check of the aircraft wiring ASM 732509 between:
    . the AEVC pin AB/10A and the EIU 1 (1KS1) pin AB/1G,
    . the AEVC pin AB/11A and the EIU 2 (1KS2) pin AB/1G.
       1 If the wiring is not ok:
  • repair it.
       2 If the wiring is ok:
       3 If the fault continues:
  • do a check of the aircraft wiring between the LGCIU 1 (5GA1) pin AB/1D and the AEVC pin AB/9C ASM 212601 and ASM 326201.
         a If the wiring is not ok:
  • repair it.
         b If the wiring is ok:
  • do a check and repair the aircraft wiring between the LGCIU 2 (5GA2) pin AB/1D and the AEVC pin AB/10C ASM 212601 and ASM 326202.
Subtask 21-26-00-810-092-F ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the crew observation:
Skin Air Valves cycling on ground:
   (1) If the fault continues:
   (2) If the fault continues:
  • do a check of the aircraft wiring between the avionics-ventilation skin temperature-sensor and the AEVC [10HQ] ASM 212602.
     (a) If the wiring is not ok:
  • repair it.
     (b) If the wiring is ok:
  • do a check of the aircraft wiring ASM 732509 between:
    . the AEVC pin AB/10A and the EIU 1 (1KS1) pin AB/1G,
    . the AEVC pin AB/11A and the EIU 2 (1KS2) pin AB/1G.
       1 If the wiring is not ok:
  • repair it.
       2 If the wiring is ok:
       3 If the fault continues:
  • do a check of the aircraft wiring between the LGCIU 1 (5GA1) pin AB/1D and the AEVC pin AB/9C ASM 212601 and ASM 326201.
         a If the wiring is not ok:
  • repair it.
         b If the wiring is ok:
  • do a check and repair the aircraft wiring between the LGCIU 2 (5GA2) pin AB/1D and the AEVC pin AB/10C ASM 212601 and ASM 326202.
[Rev.8 from Aug 2018] 2026.04.04 04:24:39 UTC
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