Installation of the Door Latch

TASK 25-45-21-400-002-A
Installation of the Door Latch

ZONE: 200

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE

B. 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 Latch - Knob Type
Door Latch - Lever Type

3. Job Set-up
Subtask 25-45-21-860-051-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 25-45-21-210-051-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 25-45-21-420-051-A

B. Installation of the Door Latch with Knob

Door Latch - Knob Type

(1) Put the door latch (12) in position and install the screws (11).
(2) Put the decorative plate (7) in position and install the screws (6).
(3) Put the spindle assy (10), the trim nut (9), the decorative plate (8) and the knob (5) in position and install washer (4) and the Screw (3).
(4) Close and open the lavatory door and make sure that the door latch (12) operates correctly.
(5) Put the plate (2) in position and install the retaining ring (1).
(6) Put the section (14) in position and install the screws (13).
(7) Make sure that the work area is clean and clear of tools and other items.
(8) Close the lavatory door.

Subtask 25-45-21-420-052-A

C. Installation of the Door Latch with Lever

Door Latch - Lever Type

(1) Put the door latch (12) in position and install the screws (11).
(2) Install the spacer (7) and the shaft (8).
(3) Put the plates (5) in position and install the screws (6).
(4) Install the spacers (9), the handles (3) and (4) and the screws (2).
(5) Close and open the lavatory door and make sure that the door latch (12) operates correctly.
(6) Install the plugs (1).
(7) Put the section (10) in position and install the screws (13).
(8) Make sure that the work area is clean and clear of tools and other items.
(9) Close the lavatory door.

5. Close-up
Subtask 25-45-21-862-051-A

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

[Rev.10 from 2021] 2026.03.31 23:36:20 UTC