Loss of the Yaw Damper Change-Over between the FAC 2 and the FAC 1

TASK 22-66-00-810-819-A
Loss of the Yaw Damper Change-Over between the FAC 2 and the FAC 1

1. Possible Causes

FAC-1 [1CC1]
wiring of the YAW OPP ENGD COM and YAW OPP 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 22-66-00-710-084-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.

4. Fault Isolation
Subtask 22-66-00-810-068-A

A. If the test gives the maintenance message AFS: FAC 1/YD ENGD CHG-OV:

(1) If the fault continues:

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

Subtask 22-66-00-710-085-A

B. Do the operational test of the automatic change-over function AMM 22-60-00-710-002.

[Rev.8 from Aug 2018] 2026.04.04 04:25:17 UTC