FCV opens during engine start

TASK 21-51-00-810-819-A
FCV opens during engine start

1. Possible Causes

wiring
EIU-1 [1KS1]
EIU-2 [1KS2]
RELAY 7HV

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 215101
ASM 215102
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 21-51-00-860-078-A

A. Aircraft Maintenance Configuration
(1) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(2) Make sure that:

on the ECAM lower display unit the BLEED page shows,
on the AIR COND panel 30VU make sure that the PACK 1 and the PACK 2 pushbutton switches are in the ON position (the FAULT and the OFF legends are off).

Subtask 21-51-00-710-080-A

B. Start the engines AMM 71-00-00-710-003.

4. Fault Isolation
Subtask 21-51-00-810-093-C ** ON A/C NOT FOR ALL

A. If 30 sec after engine start on the BLEED page a flow control valve opens:

stop the engines AMM 71-00-00-710-028,

(1) If FCV 1 opens during ENG 1 start:

do a check and repair the wiring ASM 215101 between
the EIU1 (1KS1) and ACSC1 (47HH),
the EIU1 (1KS1) and ACSC2 (57HH),

(2) If the fault continues:

replace the EIU-1 [1KS1] .

(3) If FCV 2 opens during ENG 2 start:

do a check and repair the wiring ASM 215101 between
the EIU2 (1KS2) and ACSC1 (47HH),
the EIU2 (1KS2) and ACSC2 (57HH),

(4) If the fault continues:

replace the EIU-2 [1KS2] .

Subtask 21-51-00-810-093-E ** ON A/C NOT FOR ALL

A. If 30 sec after engine start on the BLEED page a flow control valve opens:

stop the engines AMM 71-00-00-710-028,
replace the RELAY 7HV .

(1) If the fault continues:

do a check and repair the wiring ASM 215102 between
the RELAY (7HV) and RELAY (16HB),
the RELAY (7HV) and RELAY (17HB),
the RELAY (7HV) and BMC1 (1HA1).

Subtask 21-51-00-720-054-A

B. Do the test as given in the Para. 3.A.

5. Close-up
Subtask 21-51-00-860-079-A

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
AMM 31-60-00-860-002.
(2) De-energize the aircraft electrical circuits

[Rev.8 from Aug 2018] 2026.04.04 04:24:48 UTC