(2)
Electro-Matic Products Co. Degausser, Models A1-3 & A1-4 (60 Hz 115 volt) 2235 North Knox Avenue, Chicago, Illinois 60639
(3)
Printz Electric Company Degausser, Model JD (50/60 Hz 120 volt), 20854 W. 8 Mile Rd., Southfield, Michigan 48075
2. Precautions
A. Do not permit degausser to remain within 10 feet of any part of airplane UNLESS IT IS ENERGIZED.
B. DO NOT operate degausser in vicinity of magnetic compass or remote compass transmitter.
C. Care should be taken to ensure that degausser is not actually in contact with surface when it is used. (To be effective, however, it should be used as close to surface as possible).
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3. Demagnetization of the Nose Gear Strut Assembly
A. Energize degausser at a minimum distance of 10 feet from airplane and move it slowly from side of airplane towards nose gear assembly.
B. When degausser is almost touching surface of strut, move it up and down in parallel strokes while gradually working around it, and over entire length. Include steering cylinders and supporting braces.
C. Withdraw degausser to approximately 1 inch from strut and repeat process working around strut in opposite direction.
D. Withdraw degausser to point at least 10 feet from airplane before turning it off.
E. Check strut for residual magnetism with small compass. Check that there is no compass deflection when it is held 3 feet from strut and moved about in this vicinity.
F. Repeat degaussing process until area is satisfactorily demagnetized.
NOTE: The following additional check should be made where practical:
G. Jack up nose of airplane.
H. Check airplane magnetic compass for deviation when nose gear is retracted. Check that there is none.
I. Lower gear.
J. Remove jack when strut is found to be properly demagnetized.
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4. Demagnetization of Remote Compass Transmitter Area
A. Remove remote compass transmitter (flux valve) from mounting and place carefully in safe place. Ref 34-21-11, Remote Compass Transmitter - Removal/Installation.
B. Energize degausser at a minimum distance of 10 feet from airplane and move it toward remote compass transmitter area.
C. Demagnetize all steel bolts and screws in area.
D. Withdraw degausser to point at least 10 feet from airplane before turning it off.
E. Check area for residual magnetism with handheld compass and repeat stop C. as necessary.
NOTE: If a non-preindexed flux valve is not installed in its original index position, it will be necessary to swing compass to verify system accuracy.
F. Perform operational check of compass system (Ref 34-21-0, Compass System -Adjustment/Test).
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MAGNETIC STANDBY COMPASS - MAINTENANCE PRACTICES (COMPASS SWING)
1. General
A. This procedure contains one task. The procedure uses a standby compass calibrator instead of the usual tow-around procedure to do a swing of the standby compass.
B. The task has two parts. The first part is to do a swing of the standby compass through four compass points (N, E, S, W). Use this procedure for compass calibration. The second part is to do a swing of the standby compass through 12 compass points that are approximately 30 degrees apart. Use this procedure to measure the remaining errors and to make sure the standby compass heading is accurate. Use this data to make the compass correction card. This card must stay with the standby compass.
C. Do not park vehicles less than 250 feet from the airplane during the compass swing.
D. Make sure the radio receivers are on during the compass swing.
E. You can use the APU during the compass swing.
2. Standby Compass Calibrator Procedure
NOTE: The standby compass may be calibrated using one of two different procedures. One of the procedures is contained in the following paragraphs. This procedure uses a compass calibrator to swing the compass. The other procedure is contained in Section 34-21-0, Compass System Maintenance Practices as a portion of the compass swing for the primary aircraft compass. It tows the aircraft to swing the compass.
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