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AMM
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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AMM
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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Navigation
AMM
DA 40 Series
Detail Steps/Work Items Key Items/References
(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°.
(5) Align the airplane to magnetic east. Adjust the E-W compensator magnet so that the compass indicates an airplane heading of 90°.
(6) Align the airplane to magnetic south. Adjust the N-S compensator magnet to remove half of the error between what is indicated and 180°.
(7) Align the airplane to magnetic west. Adjust the E-W compensator magnet to remove half of the error between what is indicated and 270°.
(8) Turn the airplane through 360°, record the deviation at each 30° radial. Prepare a deviation table that shows the corrections that must be applied to each heading. If large deviation occur when you operate electrical equipment/systems, the deviation table must also show the corrections to apply to each 30° radial when the that particular equipment/system is operated.
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