Fuel Supply Fault (APS 3200)

TASK 49-00-00-810-909-A
Fuel Supply Fault (APS 3200)

1. Possible Causes

APU fuel pump-system
air is in the APU fuel line
SWITCH-APU FUEL LP [5030QM]
wiring
APU fuel low pressure

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-22-00-810-801-A	APU Fuel System - Low Pressure
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 28-22-00-710-001	Operational Test of the APU Fuel-Pump System on Ground to Purge the Fuel Line
AMM 28-22-14-000-001	Removal of the APU Fuel LP-Switch
AMM 28-22-14-400-001	Installation of the APU Fuel LP-Switch
AMM 49-00-00-710-008	Operational Test of the APU
AMM 49-31-00-710-002	Operational Test of the APU Fuel Low Pressure Circuit (APS 3200)
ASM 496102

3. Fault Confirmation
Subtask 49-00-00-710-266-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the APU fuel low pressure warning AMM 49-31-00-710-002.
(2) Do the operational test of the APU AMM 49-00-00-710-008.

4. Fault Isolation
Subtask 49-00-00-810-160-B ** ON A/C NOT FOR ALL

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

FUEL LOW PRESS / LOW FUEL PRESS SW (5030QM):
Fault Code Number: 112

do the operational test of the APU fuel pump-system AMM 28-22-00-710-001 and make sure that no air is in the APU fuel line .

(1) If the fault continues:

replace the SWITCH-APU FUEL LP [5030QM] AMM 28-22-14-000-001 and AMM 28-22-14-400-001.

(a) If the fault continues:

do a check and repair the wiring from the ECB (59KD) AB/B7, B8 to the APU FUEL LP-SWITCH (5030QM) P17/1, 2 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

Subtask 49-00-00-810-274-A ** ON A/C NOT FOR ALL

B. If the operational test of the APU fuel low pressure warning gives that the FUEL LO PR advisory is abnormally on:

do the trouble shooting of the APU fuel low pressure (Ref. TSM TASK 28-22-00-810-801).

Subtask 49-00-00-710-267-A ** ON A/C NOT FOR ALL

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:25 UTC