W DOC AIRBUS | TSM A320F

Failure of the Skin Air Valve

TASK 21-26-00-810-830-A
Failure of the Skin Air Valve

1. Possible Causes
  • AEVC [10HQ]
  • VALVE-SKIN AIR OUTLET, AVNCS VENT [22HQ]
  • VALVE-SKIN AIR INLET, AVNCS VENT [15HQ]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-26-00-710-001
Operational Check of the Avionics Equipment Ventilation-System via MCDU
AMM 21-26-00-710-008
Operational Test to Read the CFDS for CLASS 3 Faults of the AEVC
AMM 21-26-00-710-009
Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC
ASM 212602
ASM 212603
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)
AMM 21-26-52-000-001
Removal of the Avionics-Ventilation Skin Air-Inlet-Valve
AMM 21-26-52-400-001
Installation of the Avionics-Ventilation Skin Air-Inlet-Valve
AMM 21-26-53-000-002
Removal of the Skin Air Outlet-Valve
AMM 21-26-53-400-001
Installation of the Skin Air Outlet-Valve
3. Fault Confirmation
Subtask 21-26-00-865-068-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUAIR COND/AVNCS/VENT/MONG3HQY17
Subtask 21-26-00-710-100-A
B. Test
   (1) Do the reset of the AEVC (10HQ).
     (a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
     (b) Wait for five seconds.
     (c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
   (2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
   (3) Read the LAST LEG REPORT of the AEVC AMM 21-26-00-710-009.
   (4) Read the CLASS 3 faults of the AEVC AMM 21-26-00-710-008.
4. Fault Isolation
Subtask 21-26-00-810-083-A
A. Possible maintenance messages (one or more of the following messages):
SKIN AIR INLET V 15HQ
SKIN AIR OUTLET V 22HQ
   (1) If the test gives the maintenance messages SKIN AIR INLET V 15HQ and SKIN AIR OUTLET V 22HQ:
     (a) If the fault continues:
     (b) If the fault continues:
     (c) If the fault continues:
  • Do a check and repair the wiring between the AEVC (10HQ) and the skin air-inlet valve (15HQ) ASM 212603:
    . Pin AA/4B and pin A/C
    . Pin AA/4A and pin A/A
    . Pin AB/4B and pin A/M
    . Pin AB/4A and pin A/J.
       1 If the fault continues:
  • Do a check and repair the wiring between the AEVC (10HQ) and the skin air-outlet valve (22HQ) ASM 212602:
    . Pin AA/3A and pin A/A
    . Pin AA/3B and pin A/C
    . Pin AA/3C and pin A/E
    . Pin AB/3A and pin A/J
    . Pin AB/3B and pin A/M
    . Pin AB/3C and pin A/R.
   (2) If the test gives the maintenance message SKIN AIR INLET V 15HQ:
     (a) If the fault continues:
     (b) If the fault continues:
  • Do a check and repair the wiring between the AEVC (10HQ) and the skin air-inlet valve (15HQ) ASM 212603:
    . Pin AA/4B and pin A/C
    . Pin AA/4A and pin A/A
    . Pin AB/4B and pin A/M
    . Pin AB/4A and pin A/J.
   (3) If the test gives the maintenance message SKIN AIR OUTLET V 22HQ:
     (a) If the fault continues:
     (b) If the fault continues:
  • Do a check and repair the wiring between the AEVC (10HQ) and the skin air-outlet valve (22HQ) ASM 212602:
    . Pin AA/3A and pin A/A
    . Pin AA/3B and pin A/C
    . Pin AA/3C and pin A/E
    . Pin AB/3A and pin A/J
    . Pin AB/3B and pin A/M
    . Pin AB/3C and pin A/R.
Subtask 21-26-00-710-101-A
B. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:24:38 UTC
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