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During a manual approach, the aeroplane is subjected to wind shear with an increasing headwind. In the absence of a pilot action, the aeroplane:

1- flies above the intended approach path
2- flies below the intended approach path
3- has an increasing true airspeed
4- has a decreasing true airspeed

The combination of correct statements is:

  • A
    1, 4.
  • B
    2, 3.
  • C
    1, 3.
  • D
    2, 4.

Refer to figure.

Windshear refers to the situation where the wind changes direction or speed suddenly, over a short distance. It can be vertical or horizontal, affecting an aircraft either as it takes off or descends, or its horizontal flight path.

  • A decreasing headwind (headwind starts to switch to a tailwind) results in a sudden reduction of airspeed. Consequently, lift decreases and the aircraft will sink below the correct glide slope unless the pilot takes action.
  • On the other hand, an increasing headwind (decreasing tailwind) results in an increased airspeed. Consequently, lift increases and the aircraft "ballons" above the correct glide slope.

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