6 / 20
What is the definition for updraft or downdraft shear?
  • A
    The changes in the horizontal component of wind vector.
  • B
    The changes in the horizontal component of wind vector with vertical distance.
  • C
    Windshear resulting exclusively from thunderstorms (single-, super-, and multi-cell) and microbursts.
  • D
    The changes in the vertical component of wind vector.

WIND SHEAR is a sudden, drastic shift in wind speed and/or direction that occurs over a short distance at any altitude in a vertical or horizontal plane. It can subject your airplane to sudden updrafts and downdrafts (vertical windshear), or extreme horizontal wind components, causing loss of lift or violent changes in vertical speed or altitudes.

  • Vertical wind shear is defined as change of horizontal wind direction and/or speed with height, as would be determined by means of two or more anemometers mounted at different heights on a single mast.
  • Horizontal wind shear is defined as change of horizontal wind direction and/or speed with horizontal distance, as would be determined by two or more anemometers mounted at the same height along a runway.
Wind shear may be associated with a thunderstorm, a low-level temperature inversion, a jet stream or a frontal zone. 

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.