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Magnetic Compass

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.

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Magnetic Compass

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  1. Magnetic Compass

  2. 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

  3. Different errors • Oscillation • Variation • Deviation • Compass dip • Northerly turning • Acceleration

  4. Oscillation • Result of movement • Weights in compass • Correction • Take average heading

  5. Variation • Difference of true and magnetic north • Correction • Use chart correction

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

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

  8. 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

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

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

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