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During the approach the radio altimeter indicates 950 ft. This is:
  • A
    the true height of the lowest wheels or skids with regard to the ground.
  • B
    the height of the pilot eyes with regard to the ground.
  • C
    the relative height of the aircraft above airport level (AAL).
  • D
    the relative height of the aircraft with regard to the runway.

Refer to figure.
A radio altimeter is a self-contained onboard safety device that indicates the true height of the lowest wheels or skids (with oleos extended) above the ground.

Radar altimeter height is compensated both for the gear height and the wiring inside the helicopter, is only active at low altitudes and most useful in the landing, take-off phases and low-level flights.

Radio altimeters (with audio) are required equipment over water and is also used an an input to the Ground Proximity Warning System (GPWS) or Terrain Alert Warning System (TAWS) and TCAS.

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