Failure of the APU Bleed Check-Valve with APU Leak

TASK 36-22-00-810-931-A
Failure of the APU Bleed Check-Valve with APU Leak

1. Possible Causes

CHECK VALVE-APU BLEED [7260HM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 36-12-00-810-807-A	APU Leak
AMM 36-12-51-000-002	Removal of the APU Bleed Check-Valve
AMM 36-12-51-200-001	Remove and Check Auxiliary Power Unit Bleed Check-Valve for Condition
AMM 36-12-51-400-002	Installation of the APU Bleed Check-Valve

3. Fault Confirmation
Subtask 36-22-00-860-080-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On AIR control-panel 30VU:
(a) Make sure that all the ENG BLEED pushbutton switches are pushed (OFF legends off).

Subtask 36-22-00-740-074-A ** ON A/C NOT FOR ALL

B. Test
(1) Not Applicable

4. Fault Isolation
Subtask 36-22-00-810-231-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the maintenance message:
APUCV 7260HA + APU LEAK:
(1) Remove the APU bleed check valve AMM 36-12-51-000-002.
(a) Do a check of the APU bleed check-valve AMM 36-12-51-200-001.
(2) If you find damage:

Replace the CHECK VALVE-APU BLEED [7260HM] AMM 36-12-51-000-002 and AMM 36-12-51-400-002.
Do the trouble shooting procedure for an APU leak (Ref. TSM TASK 36-12-00-810-807).

(3) If you do not find damage:

Install the APU bleed check-valve AMM 36-12-51-400-002.
Do the trouble shooting procedure for an APU leak (Ref. TSM TASK 36-12-00-810-807).

5. Close-up
Subtask 36-22-00-710-167-A ** ON A/C NOT FOR ALL

A. After the subsequent flight, make sure that the fault does not continue.

[Rev.8 from Aug 2018] 2026.04.04 04:34:12 UTC