TM 55-1510-221-MTFPROCEDURE TROUBLESHOOTINGREFERENCEG. AVIONICS FLIGHT CHECKS (CONT)i.Check roll command function of autopilot as follows:(1)Turn control knob (autopilot pitch-turn control panel) - Turnto L and R and verify that autopilot turns aircraft left or right respectively.*2.Slaved compass systems - Check that systems agree with known magnetic headings within 2and within 3of each other*3.Inertial Navigation System Flight Test - Perform as follows:Satisfactory performance shall be demonstrated by flying over threecheckpoints whose latitude and longitude are known, and comparingthem with the inertial present position readouts. The aircraft shallestablish a low altitude, compatible with aircraft safety and applicablelaws and codes of flight, which will allow accurate sighting of groundlandmarks. An altitude of 1000 feet over waypoints and 10,000 feet ormore when between waypoints is recommended whenever possible.a.Inertial navigation system - Set up, align, and operate in accordance with TM 55-1510-221-10.b.TACAN update - Check as follows.(1) Key 4 - Depress(2) INSERT/ADVANCE key - Depress Key will dim4-10
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