14 / 20

An aircraft is descending in conditions of little or no wind. Upon contact with the ground, the trailing vortices travel horizontally away from each other at a height approximately equal to what proportion of the generating aircraft`s wing span?

  • A

    One third of the wing span.

  • B

    One and a half wing spans.

  • C

    Half the wing span.

  • D

    A quarter of the wing span.

Refer to figure.
In a question that appears to be borrowed from the POF bank, remember it is half the wing span, just as is ground effect.

ICAO Doc 9426
3.3 Minimizing the Effect of Wake Turbulence

3.3.3.6 Ground effect becomes an important factor when considering the movement and decay of the vortices. The ground acts as a plane of reflection; as the trailing vortices descend toward the ground their vertical velocity decreases and, with no or little wind, they begin to travel horizontally over the ground away from each other at a height approximately half the wing span of the generating aircraft.

Your Notes (not visible to others)



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

  • Austro Control
    82
  • United Kingdom
    69
  • Germany
    28
  • Spain
    28
  • Sweden
    15
  • Poland
    14
  • Ireland
    13
  • Latvia
    11
  • Portugal
    9
  • Norway
    8
  • Switzerland
    8
  • Greece
    7
  • Finland
    5
  • Italy
    5
  • Romania
    5
  • Denmark
    4
  • Malta
    3
  • Hungary
    2
  • Iceland
    2
  • Lithuania
    2
  • Netherlands
    2
  • Belgium
    1
  • Bulgaria
    1
  • Cyprus
    1
  • France
    1
  • Malaysia
    1
  • Slovenia
    1
Keyboard Shortcut Use Keyboard Shortcuts