Removal of the Standby Compass Bulb

TASK 34-22-23-000-002-A
Removal of the Standby Compass Bulb

ZONE: 210

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

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

C. 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)
Standby Compass Bulb

3. Job Set-up
Subtask 34-22-23-861-050-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 34-22-23-865-056-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H04
** ON A/C NOT FOR ALL
49VU	LIGHTING/STBY/COMP/LIGHT	1LF	H02

4. Procedure
Subtask 34-22-23-020-051-B

A. Removal of the Standby Compass Bulb
(1) On overhead panel 25VU, on the INT LT section, set STBY COMPASS switch 2LF to the OFF position.
(2) On the windshield center post, on the standby compass (3):
(a) Turn the lamp cap (1) counterclockwise to loosen the lamp cap (1).
(b) Remove the lamp cap (1).
(c) Carefully remove the bulb (2) from the coil spring of the standby compass (3).
(d) Make sure that you do not put force on the coil spring.

[Rev.10 from 2021] 2026.04.02 06:23:14 UTC