Magnetic_Compass by 1KeLzN7

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									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
       Compass indicates north on acceleration
       Compass indicates south on deceleration




   Correction
       ANDS
       Use compass only on straight and level flight
                           Conclusion
 Reliable
 Errors
       Oscillation
       Variation
       Deviation
       Compass Dip
       Northerly turning errors
       Acceleration errors
   Be aware of correction
       UNOS & ANDS
       ECT

								
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