18. The ground cushion is usually effective to a height of approximately one-half the diameter of the main rotor while the helicopter is (A)cruising. (B)climbing. (C)hovering. (D)downing.

5. If an aircraft is operating at 40,000 ft. the pressurization ensures that (A)sea level pressure is maintained in the cabin. (B)the cabin pressure is progressively increased until the operational height is reached. (C)the cabin pressure above 10,000 ft. (D)the cabin pressure is equivalent to an altitude of less than 10,000 ft.

18. The ground cushion is usually effective to a height of approximately one-half the diameter of the main rotor while the helicopter is
(A)cruising.
(B)climbing.
(C)hovering.
(D)downing.

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