A surface longitudinally cantered on the extended runway centre line and extending outward and upward is called

  1. Primary surface 
  2. Conical surface 
  3. Horizontal surface 
  4. Approach surface

Answer (Detailed Solution Below)

Option 4 : Approach surface
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Detailed Solution

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Approach surface is trapezoidal in shape and it is longitudinally centred on the extended centre-line of the runway. Conical surface extends upwards and outwards from the outer circular edge of the horizontal surface to a point which is at some height above the horizontal surface

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