APU By-pass Relay 1 Failed

TASK 36-11-00-810-992-A
APU By-pass Relay 1 Failed

1. Possible Causes

RELAY-APU BLEED VALVE CTL
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 204650

3. Fault Confirmation
Subtask 36-11-00-740-094-A ** ON A/C NOT FOR ALL

A. Not applicable

4. Fault Isolation
Subtask 36-11-00-810-381-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the maintenance message RELAY-APUBV CMND (21HV):
(1) Replace the RELAY-APU BLEED VALVE CTL ESPM 204650.

Subtask 36-11-00-810-382-A ** ON A/C NOT FOR ALL

B. If the test is not OK:
(1) Do a check of the wiring between the BMC1 (1HA1) pin AA/13H and BMC (1HA2) pin AA/13H and the relay (21HV) pin A/2 connector.
(a) If the wiring is damaged:

Repair o replace the wiring .

Subtask 36-11-00-810-677-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:33:54 UTC