Installation of the Standby Compass

TASK 34-22-23-400-001-A
Installation of the Standby Compass

ZONE: 210
FIN: 2FN

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

REFERENCE	QTY	DESIGNATION
CE2-40	1	KEY-CORRECTOR

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 33-13-00-710-001-A	Operational Test of the Instrument and Panel Integral-Lighting
TASK 34-22-00-730-001-A	Compensation Adjustment/Test of the Standby Compass
TASK 34-22-00-730-001-A-02	Compensation Adjustment/Test of the Standby Compass with the Standby Compass Calibrator
Standby Compass
Standby Compass P/N PGA0105W to Zero Correction

3. Job Set-up
Subtask 34-22-23-865-054-A

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 34-22-23-869-052-A

A. Standby Compass to Zero Correction (for Aircraft with Standby Compass P/N PGA0105W installed)

Standby Compass P/N PGA0105W to Zero Correction

(1) On the standby compass:
(a) Put the CE2-40 KEY-CORRECTOR into the B hole above the display window.

Use the non-magnetic corrector key to set the B corrector system to zero. Look through the correction window on the top of the standby compass to do this.

(b) Put the CE2-40 KEY-CORRECTOR into the C hole above the display window.

Use the non-magnetic corrector key to set the C corrector system to zero. Look through the correction window on the top of the standby compass to do this.

Subtask 34-22-23-420-050-A

B. Installation of the Standby Compass
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the compass structure assembly (5) is disengaged from its support (2).
(4) Remove the CAP-BLANKING from each electrical connector and receptacle.
(5) Make sure that the electrical connector (1) is clean and in the correct condition.
(6) Install the standby compass (3) in the correct position on the compass structure assembly (5).
(7) Connect the electrical connector (1) to the standby compass (3).
(8) Install the four screws (4).
(a) Tighten the four screws (4).
(9) Install the access panel assembly 211MC (6) in the correct position on the compass structure assembly (5).
(10) Install the four screws (7).
(a) Tighten the four screws (7).

Subtask 34-22-23-865-055-A

C. Remove the safety clip(s) and the tag(s) and close 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

Subtask 34-22-23-710-050-A

D. Test
(1) Do the compensation adjustment/test of the standby compass
(Ref. AMM TASK 34-22-00-730-001).
(2) Do the operational test of the instrument and panel integral lighting
(Ref. AMM TASK 33-13-00-710-001)

5. Close-up
Subtask 34-22-23-860-050-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Push on the access panel assembly 211MC (6) to engage the compass structure assembly (5) in the support (2).

[Rev.10 from 2021] 2026.04.01 04:14:40 UTC