W DOC AIRBUS | TSM A320F

Loss of the Command Inputs (ENG 1/ENG 2)

TASK 30-42-00-810-823-A
Loss of the Command Inputs (ENG 1/ENG 2)

1. Possible Causes
  • WHC-1 [2DG1]
  • RELAY-OIL LOW PRESS AND GROUND, ENG1 (12KS1)
  • RELAY-OIL LOW PRESS AND GROUND, ENG2 (12KS2)
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 30-42-00-710-001
Operational Test of the Windshield Anti-Icing and Defogging
ASM 304201
AMM 30-42-34-000-001
Removal of the Window Heat Computer (WHC)
AMM 30-42-34-400-001
Installation of the Window Heat Computer (WHC)
3. Fault Confirmation
Subtask 30-42-00-710-094-A
A. Test
   (1) Do the operational test of the windshield anti-icing and defogging AMM 30-42-00-710-001.
4. Fault Isolation
Subtask 30-42-00-810-072-A
A. If the test gives the maintenance message CHECK EIU - WHC 1 INTERFACE:
  • do a check for ground at pin B/Y and/or pin B/Z of the WHC 1 (2DG1).
   (1) If there is ground:
   (2) If there is no ground:
  • replace the RELAY-OIL LOW PRESS AND GROUND, ENG1 (12KS1).
     (a) If the fault continues:
  • replace the RELAY-OIL LOW PRESS AND GROUND, ENG2 (12KS2).
     (b) If the fault continues:
       1 Do a check and repair the wiring :
  • from the WHC 1 (2DG1) pin B/Y to the relay (12KS1) pin A/2
  • from the relay (12KS1) pin A/A to the ground
  • from the WHC 1 (2DG1) pin B/Z to the relay (12KS2) pin A/2 and
  • from the relay (12KS2) pin A/A to the ground.
ASM 304201
Subtask 30-42-00-710-095-A
B. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:29:43 UTC
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