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The directional gyro must be periodically realigned against the magnetic compass because

  • A.The gimbals lock at high bank angles
  • B.It has no north-seeking property
  • C.Its rotor speed falls in flight
  • D.The magnetic compass is unreliable in level flight

Answer: B

A gyro holds a direction but does not find one, so its indication slowly departs from magnetic heading. The compass by contrast is north-seeking but unusable in turns and accelerations, so each instrument covers the other's weakness.

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