Lumbar Rest Adjustment of the Captain Seat Inoperative

TASK 25-11-00-810-809-A
Lumbar Rest Adjustment of the Captain Seat Inoperative

1. Possible Causes

LUMBAR-REST SEAT, CAPTAIN

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 25-11-67-000-001	Removal of the Captain (First Officer) Seat Lumbar-Rest
AMM 25-11-67-400-001	Installation of the Captain (First Officer) Seat Lumbar-Rest

3. Fault Confirmation
Subtask 25-11-00-730-050-A

A. Test
(1) Adjust the lumbar rest in the vertical and horizontal directions with the two knobs, located on the pedestal side of the backrest.

NOTE: The round serrated knob ensures the vertical lumbar rest adjustment with a rack and pinion system.
The triangular knob ensures the depth adjustment of the lumbar rest with a cam-mounted rack and pinion assembly.

4. Fault Isolation
Subtask 25-11-00-810-058-A

A. If the lumbar rest adjustment of the Captain seat is inoperative:

replace the LUMBAR-REST SEAT, CAPTAIN AMM 25-11-67-000-001 and AMM 25-11-67-400-001.

Subtask 25-11-00-730-051-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:00 UTC