DOC AIRBUS | TSM A320FLoss of Power Supply of the WHC 1
TASK 30-42-00-810-829-A
Loss of Power Supply of the WHC 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 30-42-00-740-050-A 4. Fault Isolation
Subtask 30-42-00-865-062-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:43 UTC
Loss of Power Supply of the WHC 1
1. Possible Causes
- WHC-1 [2DG1]
wiring between the WHC 1 (2DG1) pin B/R and the ground terminal wiring between the WHC 1 pin B/C and the circuit breaker (5DG1) - C/B-ANTI ICE/WHC/1 [5DG1]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 24-00-00-810-803-A | Circuit Breaker Tripped and/or C/B TRIPPED Warning |
| 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) |
| AMM 31-32-00-740-003 | Ground Scanning of the CFDIU |
Subtask 30-42-00-740-050-A 4. Fault Isolation
Subtask 30-42-00-865-062-A
A. Table of the circuit breakers used in this procedure:
Subtask 30-42-00-810-078-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 122VU | ANTI ICE/WHC/1 | 5DG1 | X13 |
B. If the test gives the maintenance message NO WHC 1 DATA:
Subtask 30-42-00-740-051-A - do a check of the status of the circuit breaker (5DG1).
- do a check for 28VDC at pin B/C of the WHC 1 (2DG1) ASM 304201.
- replace the WHC-1 [2DG1] , AMM 30-42-34-000-001 and AMM 30-42-34-400-001.
- do a check for a ground signal at pin B/R of the WHC 1 (2DG1).
- repair the
wiring between the WHC 1 (2DG1) pin B/R and the ground terminal .
- do a check of the
wiring between the WHC 1 pin B/C and the circuit breaker (5DG1) .
- repair the above wiring.
- Replace the circuit breaker (5DG1).
- Do the procedure (Ref. TSM TASK 24-00-00-810-803).
- Replace the C/B-ANTI ICE/WHC/1 [5DG1] .
- Replace the WHC-1 [2DG1] .
C. Do the BITE test given in Para. 3.