Installation of the Captain (First Officer) Seat Assist Armrest-Assy

TASK 25-11-66-400-001-A
Installation of the Captain (First Officer) Seat Assist Armrest-Assy

ZONE: 211
ZONE: 212
FIN: 3MS
FIN: 4MS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05BAA1)	Threadlocking Adhesive-- Low strength -

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
211	COCKPIT
212	COCKPIT

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
Captain (First Officer) Seat Assist Armrest Assy

3. Job Set-up
Subtask 25-11-66-860-050-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 25-11-66-420-050-A

A. Installation of the Captain (First Officer) Seat Assist Armrest-Assy
(1) Clean the component interfaces and the adjacent area.
(2) Install the armrest on the fitting (11):
(a) Install the casing (25) on the armcap (1).
(b) Install the armcap (1) on the armrest (2) and install the screws (24).
(c) Tighten the screws (24).
(d) Install the armrest (2) on the fitting (11).
(e) Install the main pin (21) on the fitting (11).
(f) Install the two notched pins (7).
(g) Safety the setscrews (22) and (8) with Threadlocking Adhesive-- Low strength - (Material No.05BAA1) and install them in the main pin (21).
(h) Tighten the setscrews (22) and (8).
(i) Install the outer shroud (4), the screws (3), (5) and (6).
(j) Tighten the screws (3), (5) and (6).
(3) Install the cylinder (16):
(a) Install the shouldered pin (14) through the cylinder (16) and the pin (15).
(b) Install the washer (19) and the pin (20).
(c) Engage the cylinder (16) and the pin (15) into the main pin (21).
(d) Safety the setscrew (23) with Threadlocking Adhesive-- Low strength - (Material No.05BAA1) and install it in the main pin (21).
(e) Tighten the setscrew (23).
(f) Install the cylinder (16) on the armrest (2) and install the screw (18) and the washer (17).
(g) Tighten the screw (18).
(4) Install the assist armrest assy on the seat pan.
(5) Safety the screws (13) with Threadlocking Adhesive-- Low strength - (Material No.05BAA1) .
(6) Install the screws (13) and the washers (12) and tighten them.
(7) Make sure the seat is in the stowed position before you install the washers (12) and the screws (13).
(8) Make sure that the work area is clean and clear of tools and other items.

5. Close-up
Subtask 25-11-66-862-050-A

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

[Rev.10 from 2021] 2026.03.31 23:28:20 UTC