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

TASK 52-51-16-400-001-A
Installation 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. 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 52-51-00-710-004-A	Operational Test of the Back-Up System
Back-up Control Unit of the Cockpit-Door Locking System

3. Job Set-up
Subtask 52-51-16-860-051-A

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

Subtask 52-51-16-865-056-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 52-51-16-420-050-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 connector (3).
(6) Carefully install the control unit (1) and tighten the captive screws (2).

Subtask 52-51-16-865-052-A ** ON A/C NOT FOR ALL

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

Subtask 52-51-16-710-050-A

C. Operational Test
(1) Do an operational test of the Back-up System (Ref. AMM TASK 52-51-00-710-004).

5. Close-up
Subtask 52-51-16-410-050-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 52-51-16-862-050-A

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

[Rev.10 from 2021] 2026.04.02 06:28:26 UTC