Magnetic Compass.

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Presentation transcript:

Magnetic Compass

Magnetic Compass Oldest and most reliable instrument Construction of Compass Two bar magnets Jeweled bearing Compass card Expansion chamber Compass fluid Compensating magnet Compass weight Lubber line www.allstar.fiu.edu/aero/MagComp.htm

Different errors Oscillation Variation Deviation Compass dip Northerly turning Acceleration

Oscillation Result of movement Weights in compass Correction Take average heading

Variation Difference of true and magnetic north Correction Use chart correction

Deviation Errors in indicated heading due to local magnetic fields Different in each airplane Correction Weights in compass Correction in airplane

Compass Dip The angle of magnetic flow Correction Weight installed in compass

Northerly Turning Errors Compass unbalanced to compensate for vertical field Unbalanced condition causes compass to overshoot north and undershoot south Correction UN/OS Undershoot North Overshoot South

Acceleration Error When heading east or west Correction Compass indicates north on acceleration Compass indicates south on deceleration Correction ANDS Use compass only on straight and level flight

Conclusion Reliable Errors Be aware of correction Oscillation Variation Deviation Compass Dip Northerly turning errors Acceleration errors Be aware of correction UNOS & ANDS ECT