Operational Check of the Standby Compass Including Light Test and Visual Check

TASK 34-22-00-710-001-A
Operational Check of the Standby Compass Including Light Test and Visual Check

ZONE: 210
FIN: 2FN

1. Reason for the Job
Refer to the MPD TASK: 342200-01
OPERATIONAL CHECK OF THE STANDBY COMPASS INCLUDING LIGHT TEST AND VISUAL CHECK
To make sure that:

The difference between the magnetic heading values on the standby compass and the ND is not more than + or - 8°.
The lighting of the standby compass operates correctly.
You can read the compass cards.

NOTE: There is an alternative method for this procedure. This task gives one of the methods. The other task in this Page Block gives the other method.

2. Job Set-up Information
A. Work Zones and Access Panels

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

B. 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)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 34-10-00-860-004-A	Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01	Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02	Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
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

3. Job Set-up
Subtask 34-22-00-860-050-A

A. Aircraft Maintenance Configuration
(1) When you do this test, make sure that the aircraft is not near magnetic materials:

No metal objects (no vehicles or other aircraft) in a radius of 250 ft., and
No buildings with magnetic materials in a radius of 600 ft.

(a) To do this procedure, you can use a compensation base that has the approval from the authority.
(2) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(4) On all the Radio Management Panels (RMPs), make sure that the ON/OFF selector switch is set to the ON position.
(5) Do the Inertial Reference (IR) alignment procedure (Ref. AMM TASK 34-10-00-860-004).
(6) On the windshield center post, pull the standby compass support that you can retract from its housing.

4. Procedure
Subtask 34-22-00-710-050-E ** ON A/C NOT FOR ALL

A. Operational Test of the Standby Compass

ACTION	RESULT
1.On the CAPT ND, read the magnetic heading value.	The difference between the magnetic heading values on the standby compass and the ND is not more than + or - 8°. NOTE: If the difference between the magnetic heading values on the standby compass and the ND is more than + or - 8°: do the compensation adjustment/test of the standby compass (Ref. AMM TASK 34-22-00-730-001).
2.On the overhead panel, on ADIRS MSU panel 41VU: Set the OFF/NAV/ATT selector switch related to IR1 to the OFF position.
3.On the INT LT section of overhead control and indicating panel 25VU:	On the standby compass:
Set the ICE IND & STBY COMPASS switch to the ICE IND & STBY COMPASS position.	The lighting is on. You can read the compass cards from the CAPT and F/O seats.
Set the ICE IND & STBY COMPASS switch to the OFF position.	The lighting goes off.

Subtask 34-22-00-710-050-G ** ON A/C NOT FOR ALL

A. Operational Test of the Standby Compass

ACTION	RESULT
1.On the CAPT ND, read the magnetic heading value.	The difference between the magnetic heading values on the standby compass and the ND is not more than + or - 8°. NOTE: If the difference between the magnetic heading values on the standby compass and the ND is more than + or - 8°: do the compensation adjustment/test of the standby compass (Ref. AMM TASK 34-22-00-730-001).
2.On the overhead panel, on the ADIRS CDU: Set the OFF/NAV/ATT selector switch related to IR1 to the OFF position.
3.On the INT LT section of overhead control and indicating panel 25VU:	On the standby compass:
Set the ICE IND & STBY COMPASS switch to the ON position.	The lighting is on. You can read the compass cards from the CAPT and F/O seats.
Set the ICE IND & STBY COMPASS switch to the ICE IND & STBY COMPASS position.	The lighting goes off.

Subtask 34-22-00-210-050-A

B. Visual Inspection of the Standby Compass
(1) Do the visual inspection of the standby compass as follows:
(a) Make sure that the support is in good condition.
(b) Make sure that the standby compass is correctly attached to the support.
(c) Make sure that there are no leaks.
(d) In the compass bowl:
1 Make sure that the liquid is transparent.
2 Make sure that the liquid does not contain bubbles or sediment.
(e) Make sure that the two correction cards of the compass are on each side of the support.

5. Close-up
Subtask 34-22-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(2) On the windshield center post, push the standby compass support into its housing.
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(4) Put the aircraft back to the serviceable condition.

[Rev.10 from 2021] 2026.04.01 00:59:47 UTC