DOC AIRBUS | AMM A320FReactivation of the Yaw Damper Servo-Actuator
TASK 27-26-00-440-001-A
Reactivation of the Yaw Damper Servo-Actuator
MMEL 22-60-04A
YAW DAMPER SYSTEM (FAA ONLY)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 27-26-00-860-052-A
Subtask 27-26-00-440-050-A
Subtask 27-26-00-410-054-A Subtask 27-26-00-860-053-A
[Rev.10 from 2021]
2026.03.31 23:49:41 UTC
Reactivation of the Yaw Damper Servo-Actuator
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
1. Reason for the Job- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
MMEL 22-60-04A
YAW DAMPER SYSTEM (FAA ONLY)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 325 | VERTICAL STABILIZER TRAILING EDGE |
| 325BL, 325BR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
| TASK 27-26-51-000-001-A | Removal of the Yaw Damper Servo Actuator |
| TASK 27-26-51-400-001-A | Installation of the Yaw Damper Servo Actuator |
| TASK 29-10-00-864-001-A | Depressurize the Green Hydraulic System |
| TASK 29-10-00-864-002-A | Depressurize the Yellow Hydraulic System |
| TASK 29-10-00-864-003-A | Depressurize the Blue Hydraulic System |
| TSM 27-26-00-810-801 | (for corrective action) |
Yaw Damper Servo-Actuator 3CC1 (3CC2)Subtask 27-26-00-860-052-A
A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001)
(2) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003).
(3) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the flight controls.
Subtask 27-26-00-865-056-A (1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001)
(2) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003).
(3) Put the WARNING NOTICE(S) in the cockpit to tell persons not to operate the flight controls.
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 27-26-00-010-055-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 3CC1 (SERVO ACTRYAW DAMPER, 1) | |||
| 49VU | AUTO FLT/FAC1/28VDC | 5CC1 | B04 |
| 49VU | AUTO FLT/FAC1/26VAC | 14CC1 | B03 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AUTO FLT/FAC1/28VDC | 5CC1 | H10 |
| 49VU | AUTO FLT/FAC1/26VAC | 14CC1 | H09 |
| ** ON A/C ALL | |||
| FOR FIN: 3CC2 (SERVO ACTRYAW DAMPER, 2) | |||
| 121VU | AUTO FLT/FAC2/28VDC | 5CC2 | M19 |
| 121VU | AUTO FLT/FAC2/26VAC | 14CC2 | M18 |
C. Get Access
(1) Put an ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE in position at zone 325.
(2) Open the access door 325BL ( 325BR).
4. Procedure(1) Put an ACCESS PLATFORM 10M (33 FT) - ADJUSTABLE in position at zone 325.
(2) Open the access door 325BL ( 325BR).
Subtask 27-26-00-440-050-A
A. Reactivation of the Yaw Damper Servo-Actuator 3CC1 (3CC2).
(1) If the hydraulic pipes are connected:
(a) Cut and discard the tie-wrap from the electrical connectors (2) and (5).
(b) Remove the blanking caps from the electrical connectors (2) and (5) and from the yaw damper servo-actuator (1).
(c) Connect the electrical connectors (2) and (5) to the yaw damper servo-actuator (1).
(2) If the hydraulic pipes (3) and (4) are disconnected:
Subtask 27-26-00-865-057-A (1) If the hydraulic pipes are connected:
(a) Cut and discard the tie-wrap from the electrical connectors (2) and (5).
(b) Remove the blanking caps from the electrical connectors (2) and (5) and from the yaw damper servo-actuator (1).
(c) Connect the electrical connectors (2) and (5) to the yaw damper servo-actuator (1).
(2) If the hydraulic pipes (3) and (4) are disconnected:
- Replace the Yaw Damper Servo-Actuator 3CC1 (3CC2) (Ref. AMM TASK 27-26-51-000-001) (Ref. AMM TASK 27-26-51-400-001).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 27-26-00-942-055-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 3CC1 (SERVO ACTRYAW DAMPER, 1) | |||
| 49VU | AUTO FLT/FAC1/28VDC | 5CC1 | B04 |
| 49VU | AUTO FLT/FAC1/26VAC | 14CC1 | B03 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AUTO FLT/FAC1/28VDC | 5CC1 | H10 |
| 49VU | AUTO FLT/FAC1/26VAC | 14CC1 | H09 |
| ** ON A/C ALL | |||
| FOR FIN: 3CC2 (SERVO ACTRYAW DAMPER, 2) | |||
| 121VU | AUTO FLT/FAC2/28VDC | 5CC2 | M19 |
| 121VU | AUTO FLT/FAC2/26VAC | 14CC2 | M18 |
C. Remove the WARNING NOTICE(S).
Subtask 27-26-00-810-050-A D. Do the trouble shooting of the yaw damper servo-actuator 3CC1 (3CC2) you deactivated TSM 27-26-00-810-801.
5. Close-upSubtask 27-26-00-410-054-A Subtask 27-26-00-860-053-A
B. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001)
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001)