Reactivation of the Key Pad

TASK 52-51-00-440-007-A
Reactivation of the Key Pad

FIN: 25MQ

1. Reason for the Job
MMEL 52-51-04A
CDLS KEYPAD
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

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 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
TSM 52-51-00-810-801	Fault of the Cockpit Door Locking System (CDLS) - General
Control Unit 24MQ

3. Job Set-up
Subtask 52-51-00-860-080-A

A. Aircraft Maintenance Configuration
(1) Make sure that access to the cockpit is available.
(2) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).

Subtask 52-51-00-865-111-A

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
** ON A/C NOT FOR ALL
122VU	DOORS CKPT LOCK	1MQ	T13
122VU	COCKPIT DOOR LOCK SYSTEM	1MQ	T13

4. Procedure
Subtask 52-51-00-440-053-A

A. Reactivation of the Key Pad

Control Unit 24MQ

(1) Cut and remove the tie-wrap to release the temporarily attached connector (4).
(2) Remove the blanking caps from the electrical connector (4) and receptacle (3).
(3) Connect the electrical connector (4) to the receptacle (3).
(4) Carefully install the control unit (1) and tighten the captive screws (2).

Subtask 52-51-00-865-070-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 52-51-00-810-052-A

C. Fault Isolation Procedure
(1) Do the trouble shooting of the cockpit door lock system TSM 52-51-00-810-801.
(2) Do the operational test of the cockpit door locking system (Ref. AMM TASK 52-51-00-710-002).
(3) Do the operational test of the routine access (Ref. AMM TASK 52-51-00-710-001).
(4) Do the operational test of the emergency access (Ref. AMM TASK 52-51-00-710-003).

5. Close-up
Subtask 52-51-00-862-051-A

A. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 07:23:54 UTC