Installation of the Door Lock

TASK 25-45-21-400-001-A
Installation of the Door Lock

ZONE: 200

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

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.3 and 0.2 m.daN (26.55 and 17.70 lbf.in )
No specific	Torque wrench: range to between 0.35 and 0.2 m.daN (30.97 and 17.70 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

C. 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
Door Lock - Single Blade Door
Door Lock - Bi-folding Door (Standard Option)

3. Job Set-up
Subtask 25-45-21-860-050-A

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

4. Procedure
Subtask 25-45-21-210-050-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.

Subtask 25-45-21-420-050-A

B. Installation of the Door Locks
(1) Installation of the Single Blade Door lock:

Door Lock - Single Blade Door

(a) Open the lavatory door.
(b) Put the spring loaded cover (8) and the door lock (1) in position in the lavatory door.
(c) Lift the flap (9) and install the screws (6) and the knurled pin (7).
(d) Install the screws (4) and the knob (2).
(e) Put the section (5) in position and install the screws (3).
(f) Operate the door lock (1) and make sure it operates correctly.
(g) Close the lavatory door.
(2) Installation of the Bi-folding Door lock:

Door Lock - Bi-folding Door (Standard Option)

(a) Open the lavatory door.
(b) Put the spring loaded cover (12) and the door lock (1) in position in the lavatory door.
(c) Lift the flap (11) and install the screws (9) and the knurled pin (10).
(d) Install the screws (7) and the knob (2).
(e) Torque the knob (2) to between 0.35 and 0.2 m.daN (30.97 and 17.70 lbf.in )

.
(f) For the Person with Reduced Mobility (PRM) lavatory, install the bolt (4) and torque the bolt (4) to between 0.35 and 0.2 m.daN (30.97 and 17.70 lbf.in )

.
(g) Install the knob (3) to the bolt (4) and torque the set-screw (5) to between 0.3 and 0.2 m.daN (26.55 and 17.70 lbf.in )

.
(h) Put the section (8) in position and install the screws (6).
(i) Operate the door lock (1) and make sure it operates correctly.
(j) Close the lavatory door.

5. Close-up
Subtask 25-45-21-862-050-A

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

[Rev.10 from 2021] 2026.03.31 23:36:17 UTC