DOC AIRBUS | TSM A320FAPU AUTO SHUT DOWN - NO ACCELERATION, Main Start Contactor Fault (APS 3200)
TASK 49-00-00-810-927-A
APU AUTO SHUT DOWN - NO ACCELERATION, Main Start Contactor Fault (APS 3200)
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 49-00-00-710-291-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-810-229-B ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:34:26 UTC
APU AUTO SHUT DOWN - NO ACCELERATION, Main Start Contactor Fault (APS 3200)
1. Possible Causes
- the BAT 1 and 2 pushbutton switches are selected OFF
- aircraft wiring
- CONTACTOR-MAIN START [5KA]
- ELECTRONIC CONTROL BOX [59KD]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ESPM 2052210 | |
| ESPM 2053210 | |
| AMM 24-38-00-710-001 | Operational Test of the Battery Charge Limiter (BCL), (with the CFDS) |
| AMM 49-00-00-710-008 | Operational Test of the APU |
| ASM 494201 | |
| AMM 49-42-55-000-001 | Removal of the Start Contactors |
| AMM 49-42-55-400-001 | Installation of the Start Contactors |
| AMM 49-61-34-000-002 | Removal of the Electronic Control Box (ECB) (APS 3200) |
| AMM 49-61-34-400-002 | Installation of the Electronic Control Box (ECB) (APS 3200) |
Subtask 49-00-00-710-291-A ** ON A/C NOT FOR ALL
A. Do the operational test of the APU AMM 49-00-00-710-008.
4. Fault IsolationNOTE: Before you start the operational test of the APU, make sure that:
- the battery charge limiters 1PB1 and 1PB2 are serviceable AMM 24-38-00-710-001 or AMM 24-38-00-710-001,
- the BAT 1 and 2 pushbutton switches are pushed (the FAULT and OFF legends areoff). If the BAT 1 and 2 pushbutton switches are selected OFF , the start contactors are disconnected from the power supply,
- the Ram Air Turbine is in the retracted position.
Subtask 49-00-00-810-229-B ** ON A/C NOT FOR ALL
A. If an APU auto shutdown occurs during the APU start sequence and the APU SHUTDOWNS report gives the maintenance message:
NO ACCELERATION - CONTACTOR 5KA OR ECB 59KD:
Subtask 49-00-00-710-292-A ** ON A/C NOT FOR ALL NO ACCELERATION - CONTACTOR 5KA OR ECB 59KD:
- do a check for short to ground of the aircraft wiring from the ECB (59KD) AC/1 to the START CONTACTOR (5KA) B/3 ASM 494201 ESPM 2052210.
- repair the aircraft wiring from the ECB (59KD) AC/1 to the MAIN START CONTACTOR (5KA) B/3 ASM 494201 ESPM 2053210.
- replace the CONTACTOR-MAIN START [5KA] AMM 49-42-55-000-001 and AMM 49-42-55-400-001.
- replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-002 and AMM 49-61-34-400-002.
B. Do the test given in Para. 3.