Installation of the Deadbolt Assembly

TASK 52-51-12-400-802-A
Installation of the Deadbolt Assembly

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	GAGE - SPRING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03HBD9)	Synthetic Ester base Grease-General Purpose Low Temp -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	SCREW	AIPC 52-51-01-33-280
2	SPRING	AIPC 52-51-01-33-290

D. 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 52-51-00-710-002-A	Operational Test of the Cockpit-Door Locking System (CDLS)
TASK 52-51-00-710-008-A	Operational Check of Deadbolt
TASK 52-51-12-000-001-A	Removal of the Electrical Release Strike
TASK 52-51-12-400-001-A	Installation of the Electrical Release Strike
Deadbolt Assembly

3. Job Set-up
Subtask 52-51-12-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the access to the cockpit is available.
(2) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the cockpit door is open.
(4) Make sure that the center electrical release-strike is removed (Ref. AMM TASK 52-51-12-000-001).

Subtask 52-51-12-865-058-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 CKPT LOCK	1MQ	T13

4. Procedure
Subtask 52-51-12-420-051-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) If it was necessary to remove the deadbolt assembly:
(a) Examine the spring (2). Make sure that there is no damage to the inner square end of the spring. If there is damage, replace with a new AIPC 52-51-01-33-290 SPRING (2).
(b) Examine the screw (1). Make sure that there is no damage or wear to the four-corner shaft of the screw. If there is damage or wear, replace with a new AIPC 52-51-01-33-280 SCREW (1).
(5) Apply Synthetic Ester base Grease-General Purpose Low Temp - (Material No.03HBD9) to the deadbolt (9).

Subtask 52-51-12-420-052-A ** ON A/C NOT FOR ALL

B. Installation of the Deadbolt Assembly
(1) If it was not necessary to remove the deadbolt assembly:
(a) Install the center electrical-release strike 31MQ (Ref. AMM TASK 52-51-12-400-001).
(2) If it was necessary to remove the deadbolt assembly:
(a) Install the spring (8) in the recess of the deadbolt (9).
(b) Install the deadbolt (9) with the insert (4), the bush (13) and the screw (12).
(c) Install the bar lock (11) in the slot of the slider (3).
(d) Install the pin (10) in the bar lock (11).
(e) Put the spring (2) in position. Make sure that the outer end of the spring is correctly installed on top of the pin (10).
(f) Install the screw (1). Make sure that the four-corner shaft of the screw engages with the inner square of the spring (2).
(g) Install the washer (5), the washer (6) and the nut (7). Do not tighten the screw (1) at this time.

Subtask 52-51-12-820-051-A ** ON A/C NOT FOR ALL

C. Adjustment of the Deadbolt Assembly

NOTE: Only do this procedure if it was necessary to remove the deadbolt assembly.

(1) Make sure that the deadbolt (9) is released from the bar lock (11). If not, move the bar lock up to release the deadbolt.
(2) Hold the nut (7) and slowly tighten the screw (1) to preload the spring (2).

NOTE: Be careful when you tighten the screw (1). Make sure that the four-corner shaft of the screw (1) continues to engage with the inner square end of the spring (2).

(3) Use a GAGE - SPRING on the outer end of the spring (2).
(4) Preload the spring (2) until you can measure a force of 1.38 daN (3.10 lbf) against the pin (8) when you move the bar lock (11) up.
(5) Make sure that the clearance X between the end of the spring (2) and the edge of the slot in the strike housing (3) is 1.0 mm (0.04 in.).
(6) Install the center electrical-release strike 31MQ (Ref. AMM TASK 52-51-12-400-001).

Subtask 52-51-12-865-059-A ** ON A/C NOT FOR ALL

D. 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 CKPT LOCK	1MQ	T13

Subtask 52-51-12-720-054-A ** ON A/C NOT FOR ALL

E. Operational Test
(1) Do the operational check of the deadbolt (Ref. AMM TASK 52-51-00-710-008).
(2) Do the operational test of the cockpit door lock system (Ref. AMM TASK 52-51-00-710-002).

5. Close-up
Subtask 52-51-12-860-056-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the cockpit door is closed.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

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