Functional Test of the Door Opening Force

TASK 52-51-00-720-001-A
Functional Test of the Door Opening Force

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	SPRING BALANCE 10 DAN (24 LBF)

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)

3. Job Set-up
Subtask 52-51-00-860-064-A

A. Aircraft Maintenance Configuration
(1) Make sure that the cockpit door is closed.
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 52-51-00-865-059-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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 52-51-00-720-051-A

A. Functional Test of the Door Opening Force
(1) Do this test to make sure that the top, center and bottom latch mechanisms operate satisfactorily.
(2) Measure the operation force necessary to open the cockpit door with a SPRING BALANCE 10 DAN (24 LBF).

ACTION	RESULT
1.On the Cockpit Door:	On the Cockpit Door:
Turn the D-ring of the center latch mechanism through 90 degrees	the tenons of the top, center and bottom latch mechanism retract.
pull the cockpit door in the open direction.	the cockpit door opens
	On the cockpit Door Panel 119VU: the OPEN indicator lamp 22MQ comes on.
release the D-ring and push the cockpit door in the close direction.	the tenons of the top, center and bottom latch mechanism extent and the cockpit door moves in its closed and locked position.
2.On the C/B panel 122VU:	On the Cockpit Door:
open the circuit breaker 1MQ so that the CDLS is without electrical power.	you can hear a clacking noise from the solenoids of the electrical release strikes because they do not have electrical power.
3.On the Cockpit Door:	On the Cockpit Door:
put the spring balance on the center latch mechanism and and pull to measure the force necessary to open the unlocked cockpit door.	the cockpit door opens and the operation force must be between 2.0 daN (4.4962 lbf) and 4.0 daN (8.9924 lbf).
4.On the C/B panel 122VU:	On the Cockpit Door:
close the circuit breaker 1MQ so that the CDLS has electrical power.	you can hear a clacking noise from the solenoids of the electrical release strikes.
5.On the Cockpit Door:	On the Cockpit Door:
move the cockpit door in the close direction.	the cockpit door is closed and locked.

5. Close-up
Subtask 52-51-00-860-065-A

A. 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] 2026.04.01 12:46:51 UTC