APU AUTO SHUT DOWN - HIGH OIL TEMPERATURE (APS 3200)

TASK 49-00-00-810-896-A
APU AUTO SHUT DOWN - HIGH OIL TEMPERATURE (APS 3200)

1. Possible Causes

oil level in the APU oil reservoir is not sufficient
air passages of the oil cooler are blocked
leaks on the oil system components or oil lines
OIL COOLER (8079KM)
wiring
LUBE-PUMP OIL FILTER (8076KM)
GENERATOR OIL FILTER (8069KM)
GEN-APU [8XS]
COOLING FAN ASSEMBLY (8055KM)
APU [4005KM]
SENSOR - TEMPERATURE, HIGH OIL [8084KM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 24-23-51-000-001	Removal of the APU Generator
AMM 24-23-51-400-001	Installation of the APU Generator
AMM 31-32-00-860-001	Procedure to Get Access to the SYSTEM REPORT/TEST Menu Page
AMM 49-00-00-710-008	Operational Test of the APU
AMM 49-11-11-000-003	Removal of the Power Plant (APU) (APS 3200)
AMM 49-11-11-400-003	Installation of the Power Plant (APU) (APS 3200)
AMM 49-52-53-000-001	Removal of the PMG and Cooling Fan Assembly (APS 3200)
AMM 49-52-53-400-001	Installation of the PMG and Cooling Fan Assembly (APS 3200)
ASM 496102
AMM 49-90-00-600-004	Check Oil Level and Replenish (APS 3200)
AMM 49-91-00-210-002	Visual Inspection of the Lube Pump Filter and Generator-Scavenge Filter Differential-Pressure Indicator Position (APS 3200)
AMM 49-91-44-000-003	Removal of the Oil Cooler (APS 3200)
AMM 49-91-44-100-002	Cleaning of the Oil Cooler (APS 3200)
AMM 49-91-44-400-003	Installation of the Oil Cooler (APS 3200)
AMM 49-91-51-000-002	Removal of the Oil-Sump Temperature Sensor (APS 3200)
AMM 49-91-51-400-002	Installation of the Oil-Sump Temperature Sensor (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-240-A ** ON A/C NOT FOR ALL

A. Do the subsequent checks and the operational test of the APU.
(1) Do a check of the oil level via the MCDU SYSTEM/REPORT TEST page APU:
.push the APU MASTER SW p/bsw to ON,
.select the SYSTEM/REPORT TEST page APU AMM 31-32-00-860-001,
.select the APU DATA/OIL page.

if the oil level in the APU oil reservoir is not sufficient , do the oil servicing AMM 49-90-00-600-004.

(2) Do a check and make sure that the cooling fan inlet duct, the oil cooler inlet duct and the oil cooler outlet duct are correctly attached and in the correct condition.

correct/replace as necessary.

(3) Remove the oil-cooler inlet duct and do a check if the air passages of the oil cooler are blocked .

If the air passages are blocked, do the oil cooler cleaning procedure AMM 49-91-44-100-002 or replace the oil cooler AMM 49-91-44-000-003 and AMM 49-91-44-400-003.

(4) Carefully examine the APU externally:

make sure that you do not find leaks on the oil system components or oil lines :

(a) If you find external oil leaks:

correct/replace as necessary.

(5) Remove the cooling-fan inlet duct AMM 49-52-53-000-001 and turn the manual drive shaft of the cooling fan assy. Make sure that you can turn the manual drive shaft freely.
(6) Do the operational test of the APU AMM 49-00-00-710-008.

NOTE: Operate the APU for 10 minutes minimum under full load. This makes sure that the oil temperature increases sufficiently.

4. Fault Isolation
Subtask 49-00-00-810-147-B ** ON A/C NOT FOR ALL

A. Maintenance Action
(1) If the APU Last Leg Report gives the maintenance message:

CHECK OIL COOLER ASSY (8079KM):
Fault Code Number: 046

NOTE: The APU SHUTDOWNS report gives the maintenance message:
HIGH OIL TEMPERATURE - CHECK OIL COOLER ASSY (8079KM)
APU Auto Shut Down Fault Code Number: 046

replace the OIL COOLER (8079KM) AMM 49-91-44-000-003and AMM 49-91-44-400-003.

(a) If the fault continues:

do a check and repair the wiring from the ECB (59KD) AB/CD, D2 to the OIL TEMPERATURE SENSOR P25/1, 2 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

do a check and make sure that the LUBE-PUMP OIL FILTER (8076KM) and the GENERATOR OIL FILTER (8069KM) are serviceable AMM 49-91-00-210-002.

1 If the fault continues:

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

2 If the fault continues:

replace the COOLING FAN ASSEMBLY (8055KM) AMM 49-52-53-000-001 and AMM 49-52-53-400-001.

a If the fault continues:

replace the APU [4005KM] AMM 49-11-11-000-003 and AMM 49-11-11-400-003.

(2) If the APU Last Leg Report gives the maintenance message:

CHECK OIL COOLER ASSY (8079KM):
Fault Code Number: 046
Additionally:
Fault Code Number: 012 or 013

NOTE: FCN 012, 013 on the Class 3 Faults Page

NOTE: The APU SHUTDOWNS report gives the maintenance message:
HIGH OIL TEMPERATURE - CHECK OIL COOLER ASSY (8079KM)
APU Auto Shut Down Fault Code Number: 046

do a check and repair the wiring between the ECB (59KD) AB-C2,D2 and the OIL TEMPERATURE SENSOR P25/1,2,3 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

(a) If the fault continues:

replace the SENSOR - TEMPERATURE, HIGH OIL [8084KM] AMM 49-91-51-000-002 and AMM 49-91-51-400-002.

Subtask 49-00-00-710-241-A ** ON A/C NOT FOR ALL

B. Do the test as given in the Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:24 UTC