DOC AIRBUS | TSM A320FFailure of the Status Circuit of the APU GLC
TASK 24-23-00-810-808-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 24-23-00-740-050-B ** ON A/C NOT FOR ALL
Subtask 24-23-00-810-071-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:26:39 UTC
Failure of the Status Circuit of the APU GLC
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| 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) |
| AMM 24-41-55-000-001 | Removal of the External Power Contactor (EPC) |
| AMM 24-41-55-400-001 | Installation of the External Power Contactor (EPC) |
Subtask 24-23-00-740-050-B ** 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 24-23-00-810-071-A ** ON A/C NOT FOR ALL
A. If the BITE test gives the message TEST FAILED:
Subtask 24-23-00-810-056-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:
(1) Replace the diode module (1164VD).
(a) If the fault continues:
Subtask 24-23-00-810-056-C ** ON A/C NOT FOR ALL (1) Replace the diode module (1164VD).
(a) If the fault continues:
- Replace the RELAY-APU GLC AUX CTL [4XS] .
- Replace the GLC-APU [3XS] AMM 24-23-55-000-001 and AMM 24-23-55-400-001.
- Replace the EPC [3XG] AMM 24-41-55-000-001 and AMM 24-41-55-400-001.
* If the fault continues:
* - 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:
(1) Replace RELAY-APU GLC AUX CTL [4XS] .
(a) If the fault continues:
Subtask 24-23-00-740-051-A ** ON A/C NOT FOR ALL (1) Replace RELAY-APU GLC AUX CTL [4XS] .
(a) If the fault continues:
- Replace the GLC-APU [3XS] AMM 24-23-55-000-001 and AMM 24-23-55-400-001.
- Replace the EPC [3XG] AMM 24-41-55-000-001 and AMM 24-41-55-400-001.
- 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.