Installation of the Buzzer in the Cockpit Door Locking System (CDLS)

TASK 52-51-13-400-001-A
Installation of the Buzzer in the Cockpit Door Locking System (CDLS)

FIN: 23MQ

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 25-13-41-400-001-A	Installation of the Ceiling Panels
TASK 52-51-00-710-001-A	Operational Test of the Routine Access
Buzzer of the CDLS

3. Job Set-up
Subtask 52-51-13-860-050-A

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

Subtask 52-51-13-865-051-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
49VU	LIGHTING/EMER LT/CKPT/DOME	1LE	H08
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CKPT/DOME	1LE	H06
** ON A/C NOT FOR ALL
122VU	DOORS/PAX/MONG	1MQ	T13
** ON A/C ALL
122VU	LIGHTING/CKPT/DOME	3LE	Y06
** ON A/C NOT FOR ALL
122VU	DOORS CKPT LOCK	1MQ	T13
122VU	COCKPIT DOOR LOCK SYSTEM	1MQ	T13

4. Procedure
Subtask 52-51-13-420-050-A

A. Installation of the Buzzer
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Cut and discard the TIE WRAP(S) to release the disconnect electrical wires from the structure.
(4) Prepare the disconnected electrical wires and make sure that they are clean and in the correct condition.
(5) Put the buzzer (3) in position on the ceiling panel (5).
(6) Install the knurled nut (4) and tighten it with your hand.
(7) Connect the cable terminals (1) and (2) to the buzzer (3).

Subtask 52-51-13-410-050-A

B. Installation of the Ceiling Panel
(1) Install ceiling panel 211HC (5) (Ref. AMM TASK 25-13-41-400-001).

Subtask 52-51-13-865-052-A

C. 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
49VU	LIGHTING/EMER LT/CKPT/DOME	1LE	H08
** ON A/C NOT FOR ALL
49VU	LIGHTING/EMER LT/CKPT/DOME	1LE	H06
** ON A/C NOT FOR ALL
122VU	DOORS/PAX/MONG	1MQ	T13
** ON A/C ALL
122VU	LIGHTING/CKPT/DOME	3LE	Y06
** ON A/C NOT FOR ALL
122VU	DOORS CKPT LOCK	1MQ	T13
122VU	COCKPIT DOOR LOCK SYSTEM	1MQ	T13

Subtask 52-51-13-710-051-A

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

5. Close-up
Subtask 52-51-13-410-051-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 52-51-13-862-050-A

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

[Rev.10 from 2021] 2026.04.02 07:23:55 UTC