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Four requirement changes and their effect on the diagram.

ChangeConstraint affectedDirection of movement
Shorter landing distanceLandingLeft
Better takeoff flapsTakeoffDown
Longer runway availableTakeoffDown
Heavier design weightNoneNo movement

Which change makes the feasible region smaller?

  • A.Shorter landing distance
  • B.Better takeoff flaps
  • C.Longer runway available
  • D.Heavier design weight

Answer: A

Moving the vertical landing line leftward removes part of the plane that was previously available. The two takeoff rows both open the region up, and a heavier design leaves the non-dimensional lines exactly where they were.

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