APU AUTO SHUTDOWN - NO ACCELERATION, APU Speed is less than 7 % (N) for 30 Seconds (131-9(A))

TASK 49-00-81-810-830-A
APU AUTO SHUTDOWN - NO ACCELERATION, APU Speed is less than 7 % (N) for 30 Seconds (131-9(A))

1. Possible Causes

NO LRU DETECTED
aircraft BATTERIES
APU internal damage
MOTOR-STARTER [8KA]
STARTER MOTOR CLUTCH
GEN-APU [8XS]
ELECTRONIC CONTROL BOX [59KD]
STARTER MOTOR CLUTCH (8033KM)

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WRENCH - RATCHET
No specific	AR	WRENCH - SOCKET

B. Referenced Information

REFERENCE	DESIGNATION
AMM 24-23-51-000-001	Removal of the APU Generator
AMM 24-23-51-400-001	Installation of the APU Generator
AMM 24-38-00-210-001	Visual Inspection of the Batteries
AMM 49-00-00-860-008	APU Start by External Power
AMM 49-42-51-000-006	Removal of the Starter Motor (131-9(A))
AMM 49-42-51-400-006	Installation of the Starter Motor (131-9(A))
AMM 49-42-52-000-003	Removal of the Starter Motor Clutch (131-9(A))
AMM 49-42-52-400-003	Installation of Starter Motor Clutch (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))
AMM 49-91-42-200-004	Inspection of the Metal Chip Detector (131-9(A))

3. Fault Confirmation
Subtask 49-00-81-710-148-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.
(2) Get access to the APU SHUTDOWN report.
(3) Push the '>' adjacent to LRU DATA:

the MCDU menu shows
NO LRU DETECTED

(4) Start the APU and apply Bleed Air for 20 seconds, minimum AMM 49-00-00-860-008.

4. Fault Isolation
Subtask 49-00-81-810-107-A ** ON A/C NOT FOR ALL

A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:

NO ACCELERATION
STARTERMOTOR (8KA)/APU ROTATION

associated with Fault Code Numbers (FCN) 212

Do a check of the aircraft BATTERIES AMM 24-38-00-210-001.

(1) If the fault continues:

Do a check for APU internal damage .
- Do a check for contamination of the MAGNETIC-DRAIN PLUG AMM 49-91-42-200-004.

NOTE: If the MAGNETIC-DRAIN PLUG is not contaminated, continue without starting the APU.

.
- Remove the end cap of the STARTER MOTOR (8KA).
- Use a WRENCH - SOCKET and a WRENCH - RATCHET on the shaft of the STARTER MOTOR (8KA) to turn the APU counterclockwise (in the direction of the arrow on the housing).

(a) If the APU rotates freely:

Replace the MOTOR-STARTER [8KA] AMM 49-42-51-000-006 and AMM 49-42-51-400-006.

1 If the fault continues:

Replace the STARTER MOTOR CLUTCH AMM 49-42-52-000-003 and AMM 49-42-52-400-003.

2 If the fault continues:

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

3 If the fault continues:

Replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-003 and AMM 49-61-34-400-003.

(b) If the APU does not rotate freely:

Replace the APU (4005KM)

Subtask 49-00-81-810-107-B ** ON A/C NOT FOR ALL

Do a check of the aircraft BATTERIES AMM 24-38-00-210-001.