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You are approaching a runway that has a downward slope. This slope might lead to a visual illusion and as a result you might...

  • A

    make a faster approach than is required.

  • B

    make a higher and steeper approach than is required.

  • C

    make a slower approach than is required.

  • D

    make a lower and shallower approach than is required.

Refer to figure. 
When approaching a runway with a downslope, the pilot views it at a decreased angle, causing them to assume that they are lower above the runway than they actually are. The angle looks the same as being too low to a flat runway. The pilot might then decrease their rate of descent and land long of the runway.

  • As a result, a downsloping runway can easily make the pilot believe that they are actually low on approach (following a shallow glide slope) and have the IMPRESSION that they are going to undershoot the runway (land further inside the runway). To correct this perception, they may remain higher and then follow a steep glide slope, with the risk of landing long of the runway. Trusting their flight instruments should counteract this illusion.

DOWNSLOPING RUNWAY 
Pilot's impression → approaching the runway lower (with a shallower angle) and runway undershoot will occur
reality → approach is normal

Correction based on pilot's impression → remain higher resulting in a steep approach, overshoot the runway

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