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When flying an RF leg without autopilot, the flight director must be used for guidance. Why?
  • A
    The flight director will give a visual and audible alert if the actual navigation performance exceeds the RNP during the RF leg.
  • B
    The flight director displays guidance based on the information received from ground-based transmitters.
  • C
    The RNP system uploads the RF procedure to the FAC, which then provides guidance via the flight director.
  • D
    The RF leg is based on fixed radius turn with guidance calculated by the aircraft’s RNAV system.

The RF leg is defined by radius, arc length, and fix. RNP systems supporting this leg type provide the same ability to conform to the track-keeping accuracy during the turn as in the straight line segments.

RNP procedures with RF legs require the use of an autopilot or flight director with at least “roll-steering” capability that is driven by the RNP system. The autopilot/flight director must operate with suitable accuracy to track the lateral and, as appropriate vertical paths required by a specific RNP procedure.

The RNAV system calculated the flight path and sends guidance information to the autopilot or to the flight director (FD). No audio or visual alerts are provided for non-compliance with FD commands.

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