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the manufacturer's manuals for more data about the magnetic compass.
2. Description and Operation
The magnetic compass shows the heading of the airplane related to magnetic north. Fluid in the
compass bowl gives damping. Each graduation of the compass is 5°.
A compass deviation card attaches to the compass. Compensating magnets for compass adjustment
% are located behind the deviation card holder. The compass lighting comes on when the instrument light
% potentiometer is switched on.
You must do a test for correct operation of the compass (compass swing):
) After replacing a major component.
) After replacing the compass.
) After modification to the airplane.
) After a lightning strike has been reported.
) If the airplane has been parked for more than 90 days.
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Trouble-Shooting
1. General
The table below lists the defects you could have with the magnetic compass. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair given
in the Repair column.
Trouble Possible Cause Repair
Magnetic compass leaking
fluid.
Defective compass housing. Replace the compass.
Compass deviation more than
10°.
Residual magnetism of a metal
component in the airplane.
Defective compass.
Compass out of calibration.
Do a test for residual
magnetism using a hand-held
compass. If necessary,
degauss the component.
Replace the compass.
Do a compass swing. Refer to
the Maintenance Practices in
this Section
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Maintenance Practices
1. General
This Section tells you how to remove/install the magnetic compass. It also tells you how to test and
adjust the magnetic compass (compass swing).
2. Remove/Install the Magnetic Compass
A. Remove the Magnetic Compass
Detail Steps/Work Items Key Items/References
(1) Disconnect the electrical plug for the compass
light.
(2) Remove the screws which attach the compass to
the glare shield.
Hold the compass!
(3) Remove the compass from the airplane.
B. Install the Magnetic Compass
Detail Steps/Work Items Key Items/References
(1) Put the compass in position on the glare shield.
(2) Install the screws which attach the compass to
the glare shield.
(3) Connect the electrical plug for the compass light.
(4) Do a compass swing. Refer to Paragraph 3.
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3. Test/Adjust the Magnetic Compass (Compass Swing)
You must do a test for correct operation of the compass (compass swing):
) After replacing a major component.
) After replacing the compass.
) After modification to the airplane.
) After a lightning strike has been reported.
) If the airplane has been parked for more than 90 days.
CAUTION: USE ONLY NON-MAGNETIC TOOLS TO ADJUST THE COMPASS.
CAUTION: DO NOT WEAR OR CARRY METALLIC MATERIAL(WATCHES,
BRACELETS ETC) WHEN YOU ADJUST THE COMPASS
COMPENSATING MAGNETS OR OPERATE THE LAND COMPASS.
METALLIC MATERIALS CAN CAUSE ERRORS.
Note: If possible, use a compass swing area that has been tested for magnetic
interference. In any case, use a level area which is away from steel structure,
underground pipes, cables, reinforced concrete, other airplanes and ground
equipment.
A. Equipment
Item Quantity Part Number
Calibrated Land Compass. 1 Commercial.
B. Compass Swing
Detail Steps/Work Items Key Items/References
(1) Adjust the compensating magnets in the
compass to a neutral position.
(2) Start the engine. Set all electrical loads to ON. Refer to the Airplane Flight Manual.
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Detail Steps/Work Items Key Items/References
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(3) Use a calibrated and reliable land compass to
make sure of the airplane heading.
(4) Align the airplane to magnetic north. Adjust the N-S compensator magnet so
that the compass indicates an airplane
heading of 0°.
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钻石40系列AMM 2(75)
