DOC AIRBUS | TSM A320FFailure of the Status Circuit of the APU GLC
TASK 24-20-00-810-943-A
Failure of the Status Circuit of the APU GLC
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 24-20-00-740-068-A ** ON A/C NOT FOR ALL
Subtask 24-20-00-810-199-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:26:25 UTC
Failure of the Status Circuit of the APU GLC
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 242302 | |
| AMM 24-23-55-000-001 | Removal of the APU GLC |
| AMM 24-23-55-400-001 | Installation of the APU GLC |
| AMM 24-41-00-740-002 | Operational Check of the GAPCU via the CFDS |
| AMM 24-41-34-000-001 | Removal of the Ground Power Control Unit (GPCU) |
| AMM 24-41-34-400-001 | Installation of the Ground Power Control Unit (GPCU) |
Subtask 24-20-00-740-068-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
(a) If the BITE test gives the message TEST FAILED:
4. Fault Isolation(1) Do the BITE test of the GAPCU AMM 24-41-00-740-002.
(a) If the BITE test gives the message TEST FAILED:
- do the trouble shooting given in Para 4.A.
- do the trouble shooting given in Para 4.B.
Subtask 24-20-00-810-199-A ** ON A/C NOT FOR ALL
A. If the BITE test gives the message TEST FAILED:
Subtask 24-20-00-810-163-A ** ON A/C NOT FOR ALL - push the line key adjacent to the TEST FAILED message.
- replace the GAPCU [24XG] AMM 24-41-34-000-001 and AMM 24-41-34-400-001.
B. If the BITE test gives the message TEST PASSED:
Subtask 24-20-00-740-069-A ** ON A/C NOT FOR ALL - replace the GLC-APU [3XS] AMM 24-23-55-000-001 and AMM 24-23-55-400-001.
- do a check of the wiring for a short to 28VDC between pin B/18 of the APU GLC contactor (3XS) and pin A/6A of the GAPCU (24XG) ASM 242302.
- repair or replace as necessary.
- replace the GAPCU [24XG] AMM 24-41-34-000-001 and AMM 24-41-34-400-001.
C. Do the test given in Para. 3.