Removal of the Back-up Control Unit of the Cockpit-Door Locking System

TASK 52-51-16-000-001-A
Removal of the Back-up Control Unit of the Cockpit-Door Locking System

FIN: 28MQ ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
Back-up Control Unit of the Cockpit-Door Locking System

3. Job Set-up
Subtask 52-51-16-860-050-A

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 52-51-16-865-055-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	DOORS/PAX/MONG	1MQ	T13

4. Procedure
Subtask 52-51-16-020-050-A

A. Removal of the Control Unit
(1) Hold the control unit assembly (1) and loosen the captive screws (2).

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

(2) Carefully remove the control unit (1) to get access to the electrical connector (3).
(3) Disconnect the electrical connector (3) and remove the control unit (1).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

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