Installation of the Control Unit of the Cockpit Door Locking System (CDLS)

TASK 52-51-14-400-001-A
Installation of the Control Unit of the Cockpit Door Locking System (CDLS)

FIN: 24MQ

1. Reason for the Job
Self Explanatory
2. Job Set-up Information
A. Referenced Information

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 52-51-00-710-001-A	Operational Test of the Routine Access
TASK 52-51-00-710-002-A	Operational Test of the Cockpit-Door Locking System (CDLS)
TASK 52-51-00-710-003-A	Operational Test of the Emergency Access
Control Unit of the CDLS

3. Job Set-up
Subtask 52-51-14-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 52-51-14-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

4. Procedure
Subtask 52-51-14-420-050-A

A. Installation of the Control Unit
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: BE CAREFUL DURING REMOVAL/INSTALLATION OF THE CONTROL UNIT. THE BONDING WIRES ARE SHORT AND DAMAGE CAN EASILY OCCUR TO THEM.

(5) Put the control unit (1) in position and connect the electrical connectors (3) and (4).

CAUTION: MAKE SURE THAT YOU PROGRAM THE CONTROL UNIT OF THE COCKPIT- DOOR LOCKING SYSTEM AFTER INSTALLATION. IF YOU DO NOT, ACCESS TO THE COCKPIT AREA WILL NOT BE POSSIBLE.

(6) Carefully install the control unit (1) and tighten the captive screws (2).

Subtask 52-51-14-865-052-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

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 52-51-14-860-053-A

C. Aircraft Maintenance Configuration
(1) Do the initialization of the CDLS emergency entry-code.

NOTE: The CDLS emergency entry-code must agree with the airline procedure.
Because of possible effects on safety, the change procedure of the emergency entry-code is not included in the AMM.

Subtask 52-51-14-710-050-A

D. Operational Test
(1) Do an operational test of the CDLS (Ref. AMM TASK 52-51-00-710-002).
(2) Do an operational test of the routine access (Ref. AMM TASK 52-51-00-710-001).
(3) Do an operational test of the emergency access (Ref. AMM TASK 52-51-00-710-003).

5. Close-up
Subtask 52-51-14-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 52-51-14-862-050-A

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:28:25 UTC