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When flying over a downsloping terrain towards a flat runway, what is the pilot's perception?
  • A
    He may feel that he is going too fast, so he reduces power.
  • B
    He may feel that he is higher than he actually is.
  • C
    He may feel that he is lower than he actually is.
  • D
    He perceives a normal approach.

TERRAIN SLOPE ILLUSION

A final approach over a downsloping terrain with a flat runway may produce the visual illusion that the aircraft is lower than it actually is. If the pilot believes this illusion, he may respond by pitching the aircraft’s nose up to gain altitude. If this happens, you will land further down the runway than you intended.

A final approach over an upsloping terrain with a flat runway may produce the visual illusion that the aircraft is higher than it actually is. If the pilot believes this illusion, he may respond by pitching the aircraft nose-down to decrease the altitude, resulting in a lower approach.

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