APU AUTO SHUT DOWN - SENSOR FAILURE, Cooling Fan/PMG assy fault (APS3200)

TASK 49-00-00-810-964-A
APU AUTO SHUT DOWN - SENSOR FAILURE, Cooling Fan/PMG assy fault (APS3200)

1. Possible Causes

aircraft wiring
Cooling Fan PMG Assy (8055KM)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 49-00-00-710-008	Operational Test of the APU
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 496100

3. Fault Confirmation
Subtask 49-00-00-710-342-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 49-00-00-810-323-B ** ON A/C NOT FOR ALL

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

COOLING FAN PMG ASSY (8055KM)
Fault Code Number: 114 or 144

NOTE: The APU SHUTDOWNS report gives the maintenance message:
SENSOR FAILURE - COOLING FAN PMG ASSY (8055KM)
APU Auto Shut Down Fault Code Number: 114 or 144

disconnect the connector P28 from the Cooling Fan PMG Assy (8055KM) and do a continuity check of the aircraft wiring between:
Cooling Fan PMG Assy (8055KM) connector P28/1 and the ECB (59KD) connector 59KD-AB/H4 ASM 496100 ESPM 2052210 ESPM 2053210 ESPM 205321A.

(1) If the fault continues:

replace the Cooling Fan PMG Assy (8055KM) AMM 49-52-53-000-001 and AMM 49-52-53-400-001.

Subtask 49-00-00-710-343-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:28 UTC