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The alignment time of a strapdown inertial system takes longer time when the aircraft is:
  • A
    at a location where the magnetic variation is greater than 15 degrees.
  • B
    close to the equator.
  • C
    at a high latitude.
  • D
    at a high longitude.
Standard durations of alignment are:
  • INS: 15-20 minutes.
  • IRS: 3-10 minutes.
Bear in mind that both systems will take longer to align at high latitudes. In fact, the rotation rate about the pitch and roll axes is slower at higher latitudes (the Earth is spinning slower closer to the North pole than at the Equator).
 

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