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9/27/01 AC 43.13-1B CHG 1 SECTION 3. GROUND OPERATIONAL CHECKS FOR AVIONICS EQUIPMENT (NON ELECTRICAL) 12-37. COMPASS SWING must be per formed whenever any ferrous component of the system (i.e. flux valve compensator, or Standby Compass) is installed, removed, re paired, or a new compass is installed. The magnetic compass can be checked for accuracy by using a compass rose located on an airport. The compass swing is normally effected by placing the aircraft on various magnetic head ings and comparing the deviations with those on the deviation cards. Refer to CFR14, 23.1327, 14 CFR 23.1547, and the equipment or aircraft manufacturer's manual. a. A compass swing must be performed on the following occasions: (1) When the accuracy of the compass is suspected. (2) After any cockpit modification or major replacement involving ferrous metal. (3) Whenever a compass has been sub jected to a shock; for example, after a hard landing or turbulence. (4) After aircraft has passed through a severe electrical storm. (5) After lighting strike. (6) Whenever a change is made to the electrical system. (7) Whenever a change of cargo is likely to affect the compass. (8) When an aircraft operation is changed to a different geographic location with a major change in magnetic deviation. (e.g., from Miami, Florida to Fairbanks, Alaska.) (9) After aircraft has been parked on one heading for over a year. (10) When flux valves are replaced. b. Precautions. (1) The magnetic compass must be checked for accuracy in a location free of steel structures, underground pipes or cables, or equipment that produces magnetic fields. (2) Personnel engaged in the compen sation of the compass shall remove all mag netic or ferrous material from their possession. (3) Use only nonmagnetic tools when adjusting the compass. (4) Position the aircraft at least 100 yards from any metal object. (5) All equipment in the aircraft having any magnetic effect on the compass must be secured in the position occupied in normal flight. c. Compass Swing Procedures. (1) Have the aircraft taxied to the NORTH (0°) radial on the Compass Rose. Use a hairline sight compass (a reverse reading compass with a gun sight arrangement mounted on top of it) to place the aircraft in the general vicinity. With the aircraft facing North and the person in the cockpit running the engine(s) at 1000 rpm, a mechanic, stand ing approximately 30 feet in front of the air craft and facing South, “shoots” or aligns the master compass with the aircraft center line. Using hand signals, the mechanic signals the person in the cockpit to make additional ad justments to align the aircraft with the master Par 12-38 Page 12-13PDF Image | AFS-640
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