Loss of the Yaw Damper Function

TASK 22-63-00-810-815-A
Loss of the Yaw Damper Function

1. Possible Causes

SW-LOW OIL PRESS [4000EN]
1801VD
1800VD

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 22-63-00-810-801-A	Loss of the Yaw Damper Function on the FAC 1
TSM TASK 22-63-00-810-802-A	Loss of the Yaw Damper Function on the FAC 2
AWM 226830
AMM 71-00-00-710-028	Engine Shutdown
AMM 79-34-15-000-040	Removal of the Low Oil Pressure Switch
AMM 79-34-15-000-041	Removal of the Low Oil Pressure Switch
AMM 79-34-15-400-040	Installation of the Low Oil Pressure Switch
AMM 79-34-15-400-041	Installation of the Low Oil Pressure Switch

3. Fault Confirmation
Subtask 22-63-00-710-076-A

A. Not applicable.

Subtask 22-63-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/FAC1/28VDC	5CC1	B04
121VU	AUTO FLT/FAC2/28VDC	5CC2	M19

4. Fault Isolation
Subtask 22-63-00-810-064-A ** ON A/C NOT FOR ALL

A. If the ECAM warning AUTO FLT YAW DAMPER 1, AUTO FLT YAW DAMPER 2 or AUTO FLT YAW DAMPER SYS comes into view, at or after engine start:
(1) Do a reset of:

FAC 1 with the FLT CTL/FAC 1 pushbutton switch (on panel 25VU), and
FAC 2 with the FLT CTL/FAC 2 pushbutton switch (on panel 24VU).

(2) If the fault continues:

Shut down the engines AMM 71-00-00-710-028 and do a reset of the circuit breakers 5CC1 and 5CC2 (for more than 5 seconds).

(3) If the fault continues:

If the ECAM warning "AUTO FLT YAW DAMPER 1" is shown, replace the SW-LOW OIL PRESS [4000EN] of engine 1 AMM 79-34-15-000-040 and AMM 79-34-15-400-040, or
If the ECAM warning "AUTO FLT YAW DAMPER 2" is shown, replace the SW-LOW OIL PRESS [4000EN] of engine 2 AMM 79-34-15-000-040 and AMM 79-34-15-400-040, or

(4) If the fault continues:

Replace 1801VD AWM 226830.

(5) If the fault continues:

Replace 1800VD AWM 226830.

(6) If the fault continues:

Do the procedure(s) (Ref. TSM TASK 22-63-00-810-801) and/or (Ref. TSM TASK 22-63-00-810-802).

Subtask 22-63-00-810-064-D ** ON A/C NOT FOR ALL