APU AUTO SHUTDOWN - HIGH OIL TEMPERATURE, High Oil Temperature (131-9(A))

TASK 49-00-81-810-829-A
APU AUTO SHUTDOWN - HIGH OIL TEMPERATURE, High Oil Temperature (131-9(A))

1. Possible Causes

NO LRU FAULT DETECTED
blockage of the air intake duct
blockage of the APU inlet housing
OIL COOLER ducting
OIL TEMPERATURE SENSOR
OIL COOLER
COOLING-FAN ASSEMBLY
GEN-APU [8XS]
OIL TEMPERATURE SENSOR (8092KM)
OIL COOLER (8079KM)
COOLING-FAN ASSEMBLY (8053KM)

2. Job Set-up Information
A. 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 49-00-00-860-008	APU Start by External Power
AMM 49-52-51-000-002	Removal of the Cooling Fan (131-9(A))
AMM 49-52-51-400-002	Installation of the Cooling Fan (131-9(A))
AMM 49-91-44-000-004	Removal of the Oil Cooler (131-9(A))
AMM 49-91-44-400-004	Installation of the Oil Cooler (131-9(A))
AMM 49-94-15-000-001	Removal of Oil Temperature Sensor (131-9(A))
AMM 49-94-15-400-001	Installation of Oil Temperature Sensor (131-9(A))

3. Fault Confirmation
Subtask 49-00-81-710-144-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 FAULT DETECTED

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

4. Fault Isolation
Subtask 49-00-81-810-105-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:

HIGH OIL TEMPERATURE
OIL COOLER/COOLING FAN ASSEMBLY

associated with the Fault Code Number (FCN) 211

do a check for
blockage of the air intake duct
blockage of the APU inlet housing
OIL COOLER ducting for blockage or contamination.

(1) If there is no blockage or contamination:

replace the OIL TEMPERATURE SENSOR AMM 49-94-15-000-001 and AMM 49-94-15-400-001.

(a) If the fault continues:

do a replacement of the OIL COOLER AMM 49-91-44-000-004 and AMM 49-91-44-400-004.

(b) If the fault continues:

replace the COOLING-FAN ASSEMBLY AMM 49-52-51-000-002 and AMM 49-52-51-400-002.

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

Subtask 49-00-81-810-105-B ** 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:

HIGH OIL TEMPERATURE
OIL COOLER (8079KM) / COOLING FAN (8053KM)

associated with the Fault Code Number (FCN) 211

do a check for
blockage of the air intake duct
blockage of the APU inlet housing
OIL COOLER ducting for blockage or contamination.

(1) If there is no blockage or contamination:

replace the OIL TEMPERATURE SENSOR (8092KM) AMM 49-94-15-000-001 and AMM 49-94-15-400-001.

(a) If the fault continues:

do a replacement of the OIL COOLER (8079KM) AMM 49-91-44-000-004 and AMM 49-91-44-400-004.

(b) If the fault continues:

replace the COOLING-FAN ASSEMBLY (8053KM) AMM 49-52-51-000-002 and AMM 49-52-51-400-002.

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

Subtask 49-00-81-710-145-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

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