Operational Check of the Standby Compass Including Light Test and Visual Check (with the Standby Compass Calibrator)

TASK 34-22-00-710-001-A-01
Operational Check of the Standby Compass Including Light Test and Visual Check (with the Standby Compass Calibrator)

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 standby compass calibrator 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. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	SCREWDRIVER WIDTH 2 MM (0,23 IN) - NON MAGNETIC
2591553-901	1	CALIBRATOR,STANDBY COMPASS
OR	OR
2591553-903	1	STANBY COMPASS CALIB

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)
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 34-10-00-860-005-A	ADIRS Stop Procedure
TASK 34-22-00-730-001-A-02	Compensation Adjustment/Test of the Standby Compass with the Standby Compass Calibrator
Standby Compass
Standby Compass Calibration

3. Job Set-up
Subtask 34-22-00-860-072-A

A. Aircraft Maintenance Configuration
(1) Make sure that there are no ferromagnetic parts installed near the standby compass.

NOTE: The ferromagnetic parts (for example, fasteners and tools) near the standby compass can cause compass heading errors.

(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 34-22-00-730-070-A

A. Installation of the Standby Compass Calibrator

Standby Compass

Standby Compass Calibration

(1) Use the SCREWDRIVER WIDTH 2 MM (0,23 IN) - NON MAGNETIC to remove the four screws (1) from the plate (2) under the standby compass (4).
(2) Remove the plate (2).
(3) Use the SCREWDRIVER WIDTH 2 MM (0,23 IN) - NON MAGNETIC to remove the two screws (3) from the standby compass (4).
(4) Install the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,STANDBY COMPASS (5) with the two non-magnetic screws (6) and the two adjusting shims (7) on the standby compass (4).

Subtask 34-22-00-710-051-C ** ON A/C NOT FOR ALL

B. Operational Test of the Standby Compass

ACTION	RESULT
1.On the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,STANDBY COMPASS: Set the two drums of the knob assembly to the S position.	The standby compass shows a value between 172° and 188°. NOTE: If the value is not between 172° and 188°, do the compensation adjustment/test of the standby compass with the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,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 34-22-00-710-051-E ** ON A/C NOT FOR ALL

B. Operational Test of the Standby Compass

ACTION	RESULT
1.On the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,STANDBY COMPASS: Set the two drums of the knob assembly to the S position.	The standby compass shows a value between 172° and 188°. NOTE: If the value is not between 172° and 188°, do the compensation adjustment/test of the standby compass with the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,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 34-22-00-020-058-A

CAUTION: MAKE SURE THAT THE TWO DRUMS OF THE KNOB ASSEMBLY ARE ON THE "N" (NORTH) POSITION BEFORE YOU PUT THE STANDBY COMPASS COMPENSATOR INTO STORAGE. THIS WILL PREVENT DEMAGNETIZATION.

C. Removal of the Standby Compass Calibrator

Standby Compass

Standby Compass Calibration

(1) Remove the two non-magnetic screws (6), the two adjusting shims (7) and the 2591553-903 STANBY COMPASS CALIB2591553-901 CALIBRATOR,STANDBY COMPASS (5) from the standby compass (4).
(2) Use the SCREWDRIVER WIDTH 2 MM (0,23 IN) - NON MAGNETIC to install the two screws (3) on the standby compass (4).
(a) Tighten the two screws (3).
(3) Use the SCREWDRIVER WIDTH 2 MM (0,23 IN) - NON MAGNETIC to install the plate (2) with the four screws (1) under the standby compass (4).
(a) Tighten the four screws (1).

Subtask 34-22-00-210-051-A

D. 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 34-22-00-860-073-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) Do the Air Data and Intertial Reference System (ADIRS) stop procedure (Ref. AMM TASK 34-10-00-860-005).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(4) Put the aircraft back to the serviceable condition.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:59:48 UTC