APU AUTO SHUT DOWN - SENSOR FAILURE, Oil-Pressure Switch Fault and Low Oil-Level Condition (APS 3200)

TASK 49-00-00-810-880-A
APU AUTO SHUT DOWN - SENSOR FAILURE, Oil-Pressure Switch Fault and Low Oil-Level Condition (APS 3200)

1. Possible Causes

SWITCH-LOP [8091KM]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 49-00-00-710-005	Self-Test of the ECB
ASM 496102
AMM 49-90-00-600-004	Check Oil Level and Replenish (APS 3200)
AMM 49-94-14-000-002	Removal of the Oil Pressure Switch (APS 3200)
AMM 49-94-14-400-002	Installation of the Oil Pressure Switch (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-208-A ** ON A/C NOT FOR ALL

A. Do the self-test of the ECB (59KD) AMM 49-00-00-710-005.

4. Fault Isolation
Subtask 49-00-00-810-131-B ** ON A/C NOT FOR ALL

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

OIL PRESS SW (8091KM) AND LOW OIL LEVEL
Fault Code Number: 141
Additionally:
Fault Code Number: 043
AND
Fault Code Number: 048

NOTE: The APU SHUTDOWNS report gives the maintenance message:
SENSOR FAILURE - OIL PRESS SW (8091KM) AND LOW OIL LEVEL
APU Auto Shut Down Fault Code Number: 141

NOTE: Message does not appear in case of self-test of the ECB

do a check of the oil level in the APU oil reservoir:

(1) If the oil level in the APU oil reservoir is not sufficient:

do the oil servicing AMM 49-90-00-600-004 and replace the SWITCH-LOP [8091KM] AMM 49-94-14-000-002 and AMM 49-94-14-400-002.

(a) If the FCN 043 continues:

do check and repair the wiring from the ECB (59KD) AB/C5, J4 to the SWITCH-LOP [8091KM] P14/1, 2 ASM 496102 ESPM 2052210 ESPM 205321A ESPM 2053210.

Subtask 49-00-00-710-209-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:23 UTC