DOC AIRBUS | TSM A320FMain Start Contactor Fault (131-9(A))
TASK 49-00-81-810-902-A
Main Start Contactor Fault (131-9(A))
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 49-00-81-710-257-A ** ON A/C NOT FOR ALL
Subtask 49-00-81-810-184-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:34:39 UTC
Main Start Contactor Fault (131-9(A))
1. Possible Causes
damage/contamination of the electrical connection STRTMTR (+) - aircraft wiring
- ELECTRONIC CONTROL BOX [59KD]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MULTIMETER - STANDARD |
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 49-00-81-810-831-A | APU AUTO SHUTDOWN - NO ACCELERATION, Main Start-Contactor Fault (131-9(A)) |
| AMM 49-61-34-000-003 | Removal of the Electronic Control Box (ECB) (131-9(A)) |
| AMM 49-61-34-400-003 | Installation of the Electronic Control Box (ECB) (131-9(A)) |
Subtask 49-00-81-710-257-A ** ON A/C NOT FOR ALL
A. Read-out of ECB Trouble-Shooting Data
(1) Put the APU MASTER SW to the ON position.
(3) Push the '>' adjacent to the related CFDS failure message.
MAIN START CONTACTOR SHOWS OPEN CIRCUIT
(a) Do the Fault Confirmation that follows:
4. Fault Isolation(1) Put the APU MASTER SW to the ON position.
NOTE: Make sure that the A/C batteries are switched ON.
(2) Get access to the APU LAST LEG/PREVIOUS LEG report. (3) Push the '>' adjacent to the related CFDS failure message.
NOTE: Make sure that no APU Shutdown is associated to this fault (Ref. TSM TASK 49-00-81-810-831).
(4) If the MCDU menu shows: MAIN START CONTACTOR SHOWS OPEN CIRCUIT
(a) Do the Fault Confirmation that follows:
- Get access to the APU GND SCANNING menu.
Subtask 49-00-81-810-184-A ** ON A/C NOT FOR ALL
A. If the APU GND SCANNING menu gives the maintenance message:
ACFT BAT NOT SELECTED/CONTACTOR (5KA)
associated with the Fault Code Number (FCN) 123
(1) Do a check fordamage/contamination of the electrical connection STRTMTR (+) of the STARTER MOTOR (8KA).
(a) If the electrical connection STRT MTR (+) is damaged/contaminated:
Subtask 49-00-81-710-258-A ** ON A/C NOT FOR ALL ACFT BAT NOT SELECTED/CONTACTOR (5KA)
associated with the Fault Code Number (FCN) 123
(1) Do a check for
(a) If the electrical connection STRT MTR (+) is damaged/contaminated:
- do a repair/cleaning.
- Use a MULTIMETER - STANDARD to do a resistance check of the aircraft wiring between the electrical connection STRT MTR (+) and the ELECTRONIC CONTROL BOX [59KD] AB/J10.
- replace the aircraft wiring.
- replace the ECB (59KD) AMM 49-61-34-000-003 and AMM 49-61-34-400-003.
B. Do a check of the APU GND SCANNING menu to verify the fault is not present.