MIL-STD-765 Revision A:1967

1 SCOPE
    1.1 Purpose
    1.2 Classification
2 REFERENCED DOCUMENTS
3 DEFINITIONS (Not applicable)
4 GENERAL REQUIREMENTS
    4.1 Method I - Ground swinging
          4.1.1 Method I(a) - compass rose procedure
                  4.1.1.1 Compass swinging base
                  4.1.1.2 Means for aligning aircraft
                  4.1.1.3 Methods for aligning aircraft
          4.1.2 Method I(b) - sighting compass method
                  4.1.2.1 Sighting compass
                  4.1.2.2 Check for local variations in
                           magnetic field
                  4.1.2.3 Method of determining magnetic
                           heading of aircraft
          4.1.3 Method I(c) - magnetic method, using transit
                  4.1.3.1 Practical requirements of precision
                           ground swinging
                  4.1.3.2 Transit location
                  4.1.3.3 Alternate transit location
                  4.1.3.4 Transit mounting
                  4.1.3.5 Time interval
                  4.1.3.6 Compass signal
          4.1.4 Method I(d) - transit method
          4.1.5 Method I(e) - electrical method, using type
                  MC-1 magnetic compass calibrator set
                  4.1.5.1 Practical requirements of
                           electrical swinging
                  4.1.5.2 Procedure for electrical compass
                           swinging
          4.1.6 Method I(f) - comparison swinging
    4.2 Method II - air swinging
          4.2.1 Method II(a) - celestial bearings
                  4.2.1.1 Astrocompass method
          4.2.2 Method II(b) - terrestrial bearings
                  4.2.2.1 Drift sight
          4.2.3 Method II(c) - comparison bearings
    4.3 Preliminary precautions
          4.3.1 Position magnetic equipment in aircraft
          4.3.2 Magnetic material carried by personnel
          4.3.3 Nonmagnetic screwdriver
          4.3.4 Other magnetic and nonmagnetic parts or
                  equipment
          4.3.5 Removal of magnetic objects
          4.3.6 Check for serviceability
    4.4 Swinging of production aircraft
          4.4.1 Difference of deviation between air swing
                  and ground swing
          4.4.2 Difference of deviation due to altitude
          4.4.3 Difference of deviation due to equipment
                  operation
    4.5 Swinging of compasses having magnetic compensators
          4.5.1 Ground swings
                  4.5.1.1 Compass rose method
                  4.5.1.2 Sighting compass method
          4.5.2 Air swings
                  4.5.2.1 Setting to null effect
5 DETAIL REQUIREMENTS (Not applicable)
6 EXAMPLES OF CALCULATING COEFFICIENTS
    6.1 Coefficients having magnetic compensators
          6.1.1 Compass role metnod
                  6.1.1.1 Deviations with compensator set to
                           null effect
          6.1.2 Sighting compass method
                  6.1.2.1 Deviations with compensator set
                           to null effect
7 PROCEDURE FOR FILLING OUT STANDARD AN5823 COMPASS
    CORRECTION CARD
    7.1 Explanation of procedure
    7.2 Procedure
          7.2.1 Recording data
          7.2.2 Computations
          7.2.3 Compensation

Covers requirements concerning swinging of compasses in aircraft compensation and calibration, particularly accurate swinging of compasses in all fighter, cargo, bomber, or helicopter type aircraft utilizing a standard magnetic compass.