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As a helicopter approaches, it encounters wind shear with a decreasing tailwind. If the pilot does not make any corrections, how will this affect the approach path and the indicated airspeed (IAS)?

  • A

    The approach path becomes higher, and IAS decreases.

  • B

    The approach path becomes higher, and IAS increases.

  • C

    The approach path becomes lower, and IAS decreases.

  • D

    The approach path becomes lower, and IAS increases.

Refer to figures.
Windshear could be defined as an abrupt and localized change of wind velocity, that is strength, direction or both.

There can be several causes of low-level wind shear:

  • The passage of the front in which the isobars change direction;
  • A marked temperature inversion;
  • Sea breeze;
  • Topography and large buildings;
  • Surface friction; and
  • Cumulonimbus clouds, and their associated weather of heavy rain and hail, can give rise to the phenomenon known as Microburst.

The primary methods a pilot can employ to avoid a potentially dangerous encounter with wind shear:

  • Acknowledge the presence of wind shear;
  • Ascertain the extent of the change;
  • Stay ready to promptly rectify the situation or execute a go-around maneuver.

Therefore, for a safe escape, the pilot must initiate a "go-around" by:

  • DISengaging the autopilot;
  • Applying full power;
  • Establishing the "best climb speed".

In addition, wind shear can manifest in both vertical and horizontal forms, affecting a helicopter during takeoff, descent, or horizontal flight.

Specifically, regarding an approach and in cases where a tailwind decreases, IAS increases, lift increases, and the helicopter may fly over the correct glide slope if the pilot does not take corrective action

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