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After landing, the pilot can check the IRU performance…

  • A

    By reviewing the residual indicated ground speed when the aircraft has parked.

  • B

    By checking CDU for any error messages.

  • C

    By ATC route compared with IRU.

  • D
    By IRU and current position.

Inertial reference systems (IRS) are usually composed of up to three individual inertial reference units (IRU), each of which has its own laser gyros and accelerometers supplying data to separate computers. Every IRS output is available in up to three independent copies, which are likely to differ slightly. Greater discrepancies indicate that at least one unit is drifting. To assess the performance of individual IRUs after a flight, the pilot may:

  • Review the residual indicated ground speed when the aircraft has parked;
  • Review the drift given as NM/h.

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