DOC AIRBUS | AMM A320FDeactivation of the Buzzer of the Cockpit-Door Locking System
TASK 52-51-00-040-803-A
Deactivation of the Buzzer of the Cockpit-Door Locking System
1. Reason for the Job
MMEL 52-51-03A
CDLS BUZZER
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 52-51-00-860-118-A
Subtask 52-51-00-040-062-A
Subtask 52-51-00-865-140-A
[Rev.10 from 2021]
2026.04.02 06:28:22 UTC
Deactivation of the Buzzer of the Cockpit-Door Locking System
1. Reason for the Job
MMEL 52-51-03A
CDLS BUZZER
NOTE: This procedure is only necessary if the buzzer of the cockpit-door locking system operates permanently.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 211HC |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 25-13-41-400-001-A | Installation of the Ceiling Panels |
| TASK 52-51-00-710-002-A | Operational Test of the Cockpit-Door Locking System (CDLS) |
| TASK 52-51-13-000-001-A | Removal of the Buzzer from the Cockpit Door Locking System (CDLS) |
Subtask 52-51-00-860-118-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
Subtask 52-51-00-865-139-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
B. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 122VU | DOORS/PAX/MONG | 1MQ | T13 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | DOORS CKPT LOCK | 1MQ | T13 |
| 122VU | COCKPIT DOOR LOCK SYSTEM | 1MQ | T13 |
Subtask 52-51-00-040-062-A
A. Deactivation of the Buzzer of the Cockpit-Door Locking System
(1) Remove the buzzer of the cockpit-door locking system (Ref. AMM TASK 52-51-13-000-001).
5. Close-up(1) Remove the buzzer of the cockpit-door locking system (Ref. AMM TASK 52-51-13-000-001).
Subtask 52-51-00-865-140-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 52-51-00-710-066-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 122VU | DOORS/PAX/MONG | 1MQ | T13 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | DOORS CKPT LOCK | 1MQ | T13 |
| 122VU | COCKPIT DOOR LOCK SYSTEM | 1MQ | T13 |
B. Operational Test
(1) Do the Operational Test of the Cockpit-Door Locking System (CDLS) (Ref. AMM TASK 52-51-00-710-002).
Subtask 52-51-00-410-055-A (1) Do the Operational Test of the Cockpit-Door Locking System (CDLS) (Ref. AMM TASK 52-51-00-710-002).
C. Close Access
(1) Install ceiling panel 211HC (Ref. AMM TASK 25-13-41-400-001).
(2) Make sure that the work area is clean and clear of tools and other items.
Subtask 52-51-00-860-119-A (1) Install ceiling panel 211HC (Ref. AMM TASK 25-13-41-400-001).
(2) Make sure that the work area is clean and clear of tools and other items.
D. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(2) Make an entry in the logbook.
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(2) Make an entry in the logbook.