Failure of the APU Generator

TASK 24-23-00-810-810-A
Failure of the APU Generator

1. Possible Causes

GEN-APU [8XS]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 242301
AMM 24-23-51-000-001	Removal of the APU Generator
AMM 24-23-51-400-001	Installation of the APU Generator
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power

3. Fault Confirmation
Subtask 24-23-00-869-051-A ** ON A/C NOT FOR ALL

A. Test
Not applicable.

NOTE: As the APU GEN was set to OFF because of a true failure, the fault confirmation is not necessary.

4. Fault Isolation
Subtask 24-23-00-810-058-B ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the CFDS message GEN APU (8XS) /WRG: GEN APU PMG and the upper ECAM-DU warning APU GEN FAULT:

replace the GEN-APU [8XS] AMM 24-23-51-000-001 and AMM 24-23-51-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 242301 for a short to shield, a short to ground, a short circuit or an open circuit between:
. pin A/12 of the APU generator and pin C/10 of the GAPCU
. pin A/13 of the APU generator and pin C/11 of the GAPCU
. pin A/14 of the APU generator and pin C/9 of the GAPCU
. pins C/9, C/10, C/11 and pin C/7 of the GAPCU.

Subtask 24-23-00-860-053-A ** ON A/C NOT FOR ALL

B. Make sure that the aircraft electrical circuits operate correctly in APU configuration.
(1) Energize the aircraft electrical circuits from the APU AMM 24-41-00-861-002.
(2) Let the APU generator operate for five minutes to make sure that it operates correctly.
(3) De-energize the aircraft electrical circuits from the APU AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:39 UTC