Transcription of Section 1. GROUND OPERATIONAL CHECKS FOR AVIONICS
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9/27/01AC CHG 1 Par 12-38 Page 12-13 Section 3. GROUND OPERATIONAL CHECKS FOR AVIONICS EQUIPMENT(NON ELECTRICAL)12-37. COMPASS SWING must be per-formed whenever any ferrous component ofthe system ( flux valve compensator, orStandby Compass) is installed, removed, re-paired, or a new compass is installed. Themagnetic compass can be checked for accuracyby using a compass rose located on an compass swing is normally effected byplacing the aircraft on various magnetic head-ings and comparing the deviations with thoseon the deviation cards. Refer to CFR14, , 14 CFR , and the equipmentor aircraft manufacturer's A compass swing must be performed onthe following occasions:(1) When the accuracy of the compassis suspected.
AC 43.13-1B CHG 1 9/27/01 Page 12-14 Par 12-37 compass. Once aligned on the heading, the person in the cockpit runs the engine(s) to ap-proximately 1,700 rpm to duplicate the air-
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