APU AUTO SHUT DOWN - NO ACCELERATION, Back-up Start Contactor Fault (APS 3200)

TASK 49-00-00-810-928-A
APU AUTO SHUT DOWN - NO ACCELERATION, Back-up Start Contactor Fault (APS 3200)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052210
ESPM 2053210
AMM 49-00-00-710-008	Operational Test of the APU
ASM 494201
AMM 49-42-51-000-007	Removal of the Starter Motor (APS 3200)
AMM 49-42-51-400-007	Installation of the Starter Motor (APS 3200)
AMM 49-42-55-000-001	Removal of the Start Contactors
AMM 49-42-55-400-001	Installation of the Start Contactors

3. Fault Confirmation
Subtask 49-00-00-710-293-A ** ON A/C NOT FOR ALL

A. Do the operational test of the APU AMM 49-00-00-710-008.

4. Fault Isolation
Subtask 49-00-00-810-231-B ** ON A/C NOT FOR ALL

A. If the APU Last Leg Report gives the maintenance message:

CONTACTOR 10KA:
Fault Code Number: 051
Additionally:
Fault Code Number: 018 or 086

NOTE: The APU SHUTDOWNS report gives the maintenance message:
NO ACCELERATION - CONTACTOR 10KA
APU Auto Shut Down Fault Code Number: 051

do a check and repair the wiring from the BACK-UP START CONTACTOR (10KA) B/5 to the ground ASM 494201 ESPM 2052210 ESPM 2053210.

(1) If the fault continues:

do a check and repair the wiring from the ECB (59KD) AC/6 to the BACK-UP START CONTACTOR (10KA) B/3 ASM 494201 ESPM 2052210 ESPM 2053210.

(2) If the fault continues:

replace the CONTACTOR-BACK-UP START [10KA] AMM 49-42-55-000-001 and AMM 49-42-55-400-001.

(3) If the fault continues:

do a check and repair the wiring between ECB (59KD) AB/J10 and STARTER MOTOR (8KA) positive terminal ASM 494201 ESPM 2052210 ESPM 2053210.

(4) If the fault continues:

Subtask 49-00-00-710-294-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:26 UTC