APU AUTO SHUT DOWN - REVERSE FLOW, Bleed Ctl Valve and APU Bleed Check Valve Fault (APS 3200)

TASK 49-00-00-810-901-A
APU AUTO SHUT DOWN - REVERSE FLOW, Bleed Ctl Valve and APU Bleed Check Valve Fault (APS 3200)

1. Possible Causes

CHECK VALVE-APU BLEED [7260HM]
BLEED CONTROL VALVE (8051KM)
ELECTRONIC CONTROL BOX [59KD]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 36-12-51-000-001	Removal of the Check Valve
AMM 36-12-51-400-001	Installation of the Check Valve
AMM 49-00-00-710-008	Operational Test of the APU
AMM 49-51-53-000-001	Removal of the Bleed Control Valve (APS 3200)
AMM 49-51-53-400-001	Installation of the Bleed Control Valve (APS 3200)
AMM 49-61-34-000-002	Removal of the Electronic Control Box (ECB) (APS 3200)
AMM 49-61-34-400-002	Installation of the Electronic Control Box (ECB) (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-250-B ** ON A/C NOT FOR ALL

A. Do the subsequent checks and the operational test of the APU.
(1) do a check for the quick disconnect pin of the IGV-ACTUATOR.
(2) Do the operational test of the APU AMM 49-00-00-710-008.

4. Fault Isolation
Subtask 49-00-00-810-152-B ** ON A/C NOT FOR ALL

A. If an APU auto shutdown occurs during the operational test of the APU and the APU SHUTDOWNS report gives the maintenance message

REVERSE FLOW - BCV P33 AND BLEED CHECK VALVE 7260HM

replace the CHECK VALVE-APU BLEED [7260HM] AMM 36-12-51-000-001 and AMM 36-12-51-400-001.

(1) If the fault continues:

replace the BLEED CONTROL VALVE (8051KM) AMM 49-51-53-000-001 and AMM 49-51-53-400-001.

(2) If the fault continues:

replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-002 and AMM 49-61-34-400-002.

Subtask 49-00-00-710-251-B ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

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