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How can an INS/IRS be realigned in flight if alignment is lost for some reason?
  • A
    By setting the INS mode selector to "ALIGN" and waiting for the required time.
  • B
    By setting the INS mode selector to "GPS" and realigning the INSARS through the GPS.
  • C
    By setting the INS mode selector to "ALIGN" and then flying straight and level with NO airspeed variations for at least 10 minutes.
  • D
    It can NOT, the aircraft must be stationary on the ground for alignment to be performed.

Refer to figures.
An Inertial Navigation System (INS) provides the aeroplane’s velocity and position by continuously measuring and integrating its acceleration. This system relies on no external references, is unaffected by weather.

The products of an INS are position (latitude/longitude), speed (kt), distance (nautical miles), and other navigational information.

The accuracy of an INS is dependent on the alignment of the platform in azimuth and the attitude of the stable element. The platform must be horizontal (level) and aligned to the selected heading datum, normally true north, which must be maintained throughout the flight. It is important that the levelling and alignment processes be carried out on the ground with the aeroplane stationary.

If the alignment of the IRS is lost in flight due to the loss of DC or AC, or the mode selector switch is moved out of the NAV mode detent, the position and ground speed outputs are inoperative for the remainder of the flight.

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