Loss of the Reception of the YD ENGD Feedback Discrete by the FAC 1

TASK 22-63-00-810-803-A
Loss of the Reception of the YD ENGD Feedback Discrete by the FAC 1

1. Possible Causes

FAC-1 [1CC1]
wiring of the YAW ENGD COM and YAW ENGD MON discretes (from the FAC 1 (1CC1) to the first terminal block)
wiring of the YAW OWN ENGD COM and YAW OWN ENGD MON discretes (from the FAC 1 (1CC1) to the first terminal block)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-60-00-710-002	Operational Test of the Automatic Change-Over Function
AMM 22-66-34-000-002	Removal of the FAC
AMM 22-66-34-400-002	Installation of the FAC
ASM 226804
AMM 22-96-00-710-001	Operational Test of the AFS

3. Fault Confirmation
Subtask 22-63-00-710-056-A

A. Test
(1) Do the operational test of the AFS AMM 22-96-00-710-001 and read the result for the FAC 1.
(2) Do the operational test of the automatic change-over function AMM 22-60-00-710-002.

4. Fault Isolation
Subtask 22-63-00-810-054-A

A. If the operational test of the AFS gives the maintenance message AFS: FAC1/YD ENGD FDBK:
(1) If the operational test of the automatic change-over function gives the maintenance message AFS: FAC2/YD ENGD CHG-OV:

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

(a) If the fault continues:

do a check and repair the wiring of the YAW ENGD COM and YAW ENGD MON discretes (from the FAC 1 (1CC1) to the first terminal block), ASM 226804.

(2) If the operational test of the automatic change-over function does not give the maintenance message AFS: FAC2/YD ENGD CHG-OV:

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

(a) If the fault continues:

do a check and repair the wiring of the YAW OWN ENGD COM and YAW OWN ENGD MON discretes (from the FAC 1 (1CC1) to the first terminal block), ASM 226804.

Subtask 22-63-00-710-057-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:25:13 UTC