DOC AIRBUS | TSM A320FFailure of the HP FUEL VALVE CLOSED Discrete Output on EIU 2
1. Possible Causes
· wiring from the EIU 2 (1KS2) to the zone controller (8HK)
· EIU-2 ( 1KS2 )
· ZONE CONTROLLER ( 8HK )
· wiring from the EIU 2 (1KS2) to the ACSC (47HH, 57HH)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 21-61-34-000-002 Removal of the Air-Conditioning System Controller
Ref. AMM 21-61-34-400-002 Installation of the Air-Conditioning System Controller
Ref. AMM 21-63-34-000-001 Removal of the Zone Controller
Ref. AMM 21-63-34-400-001 Installation of the Zone Controller
Ref. ASM 73-25-09
Ref. AMM 73-25-34-000-041 Removal of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-400-041 Installation of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-710-042 Operational Test of the EIU with the CFDS
3. Fault Confirmation
Subtask 73-25-00-710-126-A
A. Test
(1) Do the operational test of the EIU 2 with the CFDS Ref. AMM 73-25-34-710-042 .
4. Fault Isolation
Subtask 73-25-00-810-088-A
A. If the operational test gives the maintenance message CHECK ZONE CONT 8HK/EIU2 CIRCUIT:
· do a check of the wiring from the EIU 2 (1KS2) to the zone controller (8HK) pin AB/1E to pin AB/K
Ref. ASM 73-25-09.
(1) If there is no continuity:
· repair the above wiring.
(2) If there is continuity:
· replace the EIU-2 ( 1KS2 ) , Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(a) If the fault continues:
· replace the ZONE CONTROLLER ( 8HK ) , Ref. AMM 21-63-34-000-001 and Ref.
AMM 21-63-34-400-001 .
Subtask 73-25-00-810-088-B
A. If the operational test gives the maintenance message CHECK ZONE CONT 8HK/EIU2 CIRCUIT:
· do a check of the wiring from the EIU 2 (1KS2) to the ACSC (47HH, 57HH) pin AB/1E to pin AB/1K
Ref. ASM 73-25-09.
(1) If there is no continuity:
· repair the above wiring.
(2) If there is continuity:
· replace the EIU-2 ( 1KS2 ) , Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(a) If the fault continues:
· replace the ACSC (47HH, 57HH) Ref. AMM 21-61-34-000-002 and Ref.
AMM 21-61-34-400-002 .
Subtask 73-25-00-710-127-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:36:24 UTC