FAC 1 OFF Legend does not Come on when the FAC 1 Function Disengages

TASK 22-66-00-810-840-A
FAC 1 OFF Legend does not Come on when the FAC 1 Function Disengages

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2045110
ASM 226501

3. Fault Confirmation
Subtask 22-66-00-865-056-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	LIGHTING/TST/BOARD/SPLY	30LP	X06
122VU	LIGHTING/ANN LT SPLY/XFMR/STAT INV	28LP	X03

Subtask 22-66-00-710-126-A

B. Test
(1) Make sure that the FLT CTL/FAC 1 pushbutton switch (12CC1) is released and that the OFF legend is on.

4. Fault Isolation
Subtask 22-66-00-810-094-A

A. If the OFF legend is not on:

(1) If the FAULT legend of the FLT CTL/FAC 1 pushbutton switch does not come on:

do a check and repair the wiring of the 5VAC signal at the FLT CTL/FAC 1 pushbutton switch (12CC1) (from pin A/8 to the first terminal block) ASM 226501.

(2) If the FAULT legend of the FLT CTL/FAC 1 pushbutton switch comes on:

(a) If the OFF legend of the FLT CTL/FAC 1 pushbutton switch does not come on:

1 If the fault continues:

do a check and repair the wiring of the FLT CTL/FAC 1 pushbutton switch (12CC1) (from pin A/9 to pin A/6 and from pin A/4 to pin A/A3) ASM 226501.

(b) If the OFF legend of the FLT CTL/FAC 1 pushbutton switch comes on:

do a check and repair the wiring of the ground signal at the FLT CTL/FAC 1 pushbutton switch (12CC1) pin A/A2 ASM 226501.

Subtask 22-66-00-710-127-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 22-66-00-860-054-A

A. Put the aircraft back to its initial configuration.
(1) On the panel 25VU, set the ANN LT switch to BRT.

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