Adjustment of the Cockpit Door - Clearance P of the Latch Mechanism

TASK 52-51-00-820-807-A
Adjustment of the Cockpit Door - Clearance P of the Latch Mechanism

ZONE: 220

1. Reason for the Job

NOTE: Two persons are necessary to do this procedure.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	FLASHLIGHT
No specific	1	RULER - STEEL
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
220	FWD CAB UTILITY AREAS
221AC

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-72-51-000-001-A	Removal of the Anti-Hijack-System Cameras
TASK 23-72-51-400-001-A	Installation of the Anti-Hijack-System Cameras
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 25-23-42-000-001-A	Removal of the Ceiling Panels - Forward Utility Area
TASK 25-23-42-400-001-A	Installation of the Ceiling Panels - Forward Utility Area
TASK 33-21-12-400-001-A	Installation of the Cabin Entrance Light Dimming Switch
TASK 52-51-00-710-002-A	Operational Test of the Cockpit-Door Locking System (CDLS)
TASK 52-51-00-720-003-A	Functional Check of Correct Adjustment of Cockpit Door, Electrical Release Strikes and Latch Mechanism
TASK 52-51-00-820-001-A	Adjustment of the Cockpit Door, Electrical Release Strikes and Latch Mechanisms
Cockpit Door - Adjustment of Clearance P

3. Job Set-up
Subtask 52-51-00-860-132-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 52-51-00-865-151-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

Subtask 52-51-00-010-063-A

C. Get Access
(1) Remove anti-hijack camera [12RA] (Ref. AMM TASK 23-72-51-000-001).
(2) Remove ceiling panel 221AC (Ref. AMM TASK 25-23-42-000-001).

4. Procedure
Subtask 52-51-00-820-060-A

A. Adjustment of the Cockpit Door - Clearance P of the Latch Mechanism
(1) If necessary, use the FLASHLIGHT to do the adjustment of clearance P.
(2) Adjust clearance P of the latch mechanism as follows:
(a) Close the cockpit door (3).
(b) Make sure that the D-ring (4) of the center latch mechanism stays in its recess.
(c) Make sure that the top and bottom latch tenons (8) are in the fully closed position before the center latch tenon (8) engages.
(d) Use the RULER - STEEL to measure clearance P between the latch tenon (8) and the slot of the access cover (2).
1 Make sure that clearance P is:

Between 3 mm (0.1181 in.) and 4 mm (0.1575 in.) with the full body latch-tenon (8)
Between 5.5 mm (0.2165 in.) and 7.5 mm (0.2953 in.) with the decreased latch-tenon (8) size.

(e) If clearance P is not in the limits, adjust it as follows:
1 Open the cockpit door (3) and carefully lift it until there is no load on the adjustment nut (7).

NOTE: The cockpit door (3) weighs approximately 35 kg (77.1618 lb).

2 Remove the locknut (6).
3 Turn the adjustment nut (7) until clearance P is correctly adjusted.
4 Lower the cockpit door (3) and make sure that clearance P is correct.
5 Install the locknut (6).
6 Tighten the locknut (6).
(f) Make sure that the cockpit door (3) is in the highest possible position and clearance P in the given limits.

NOTE: This is to make sure that the latch tenon (8) does not touch the access cover (2) during the flight.

(g) Make sure that limit switch 310LG (5) in the cockpit wall panel (1) is correctly adjusted (Ref. AMM TASK 33-21-12-400-001).
(h) Use the RULER - STEEL to measure clearance A between the top of the closed cockpit door (3) and the cockpit wall panel (1).
1 Make sure that clearance A is between 4.0 mm (0.1575 in.) and 5.5 mm (0.2165 in.) (Ref. AMM TASK 52-51-00-720-003).

Subtask 52-51-00-865-158-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 52-51-00-710-071-A

C. Operational Test of the Cockpit Door and the Latch Mechanism
(1) Do an operational test of the cockpit door (3) and the latch mechanism (Ref. AMM TASK 52-51-00-710-002).
(2) If the results of the test are unsatisfactory or you cannot adjust clearance P as in step 4.A:
(a) Do the adjustment procedure of the cockpit door (3), the electrical release strikes and the latch mechanisms (Ref. AMM TASK 52-51-00-820-001).

5. Close-up
Subtask 52-51-00-410-058-A

A. Close Access
(1) Install ceiling panel 221AC (Ref. AMM TASK 25-23-42-400-001).
(2) Install anti-hijack camera [12RA] (Ref. AMM TASK 23-72-51-400-001).

Subtask 52-51-00-860-133-A

B. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 07:23:58 UTC