FAC 1 FAULT Legend Comes on without ECAM Warning

TASK 22-66-00-810-836-A
FAC 1 FAULT Legend Comes on without ECAM Warning

1. Possible Causes

FAC-1 [1CC1]
wiring of the FAC ENGD SW COM and FAC ENGD SW MON discretes (from the FAC 1 (1CC1) to the FLT CTL/FAC 1 pushbutton switch (12CC1))
wiring of the 28VDC and GND FAC discretes (from the FAC 1 (1CC1) to the FLT CTL/FAC 1 pushbutton switch (12CC1))
RELAY-FAC1 ENGAGED [11CC1]
wiring of the FAC ENGD COM and FAC ENGD MON discretes (from the FAC 1 (1CC1) to the FAC 1 ENGAGED relay (11CC1))

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 226501
AMM 22-66-34-000-002	Removal of the FAC
AMM 22-66-34-400-002	Installation of the FAC
AMM 22-96-00-710-001	Operational Test of the AFS

3. Fault Confirmation
Subtask 22-66-00-710-118-A

A. Test
(1) Do the operational tests of the AFS AMM 22-96-00-710-001 and read the result for the FAC 1:
(a) with the FLT CTL/FAC1 pushbutton switch (12CC1) released.
(b) with the FLT CTL/FAC1 pushbutton switch (12CC1) pushed.

4. Fault Isolation
Subtask 22-66-00-810-086-A

A. If only the first test gives the maintenance message AFS: FAC1/P-B SW 12CC1:

replace the FAC-1 [1CC1] , AMM 22-66-34-000-002 and AMM 22-66-34-400-002.

(1) If the fault continues:

do a check and repair the wiring of the FAC ENGD SW COM and FAC ENGD SW MON discretes (from the FAC 1 (1CC1) to the FLT CTL/FAC 1 pushbutton switch (12CC1)), ASM 226501.

Subtask 22-66-00-810-087-A

B. If only the second test gives the maintenance message AFS: FAC1/P-B SW 12CC1:

replace the FAC 1 (1CC1) AMM 22-66-34-000-002 and AMM 22-66-34-400-002.

(1) If the fault continues:

do a check of the wiring of the FAC ENGD SW COM and FAC ENGD SW MON discretes (from the FAC 1 (1CC1) to the FLT CTL/FAC 1 pushbutton switch (12CC1)) ASM 226501.

(a) If there is no continuity:

repair the above wiring.

(b) If there is continuity:

do a check and repair the wiring of the 28VDC and GND FAC discretes (from the FAC 1 (1CC1) to the FLT CTL/FAC 1 pushbutton switch (12CC1)), ASM 226501.

Subtask 22-66-00-810-088-A

C. If the two tests do not give the maintenance message:

replace the FAC 1 (1CC1) AMM 22-66-34-000-002 and AMM 22-66-34-400-002.

(1) If the fault continues:

replace the RELAY-FAC1 ENGAGED [11CC1] .

(2) If the fault continues:

do a check and repair the wiring of the FAC ENGD COM and FAC ENGD MON discretes (from the FAC 1 (1CC1) to the FAC 1 ENGAGED relay (11CC1)) ASM 226501.

Subtask 22-66-00-710-119-A

D. Do the test given in Para. 3.A.1.(b).

[Rev.8 from Aug 2018] 2026.04.04 04:25:18 UTC