Turbulence

Question 1

A pilot reporting turbulence that momentarily causes slight erratic changes in altitude and/or attitude should report it as

Answer 1

light turbulence.

Question 2

When turbulence causes changes in altitude and/or attitude, but aircraft control remains positive, that should be reported as

Answer 2

moderate.

Question 3

Turbulence that is encountered above 15,000 feet AGL not associated with cumuliform cloudiness,
including thunderstorms, should be reported as

Answer 3

clear air turbulence.

Question 4

The minimum vertical wind shear value critical for probable moderate or greater turbulence is

Answer 4

6 knots per 1,000 feet.

Question 5

One of the most dangerous features of mountain waves is the turbulent areas in and

Answer 5

below rotor clouds.

Question 6

The conditions most favorable to wave formation over mountainous areas are a layer of

Answer 6

stable air at mountaintop altitude and a wind of at least 20 knots blowing across the ridge.

Question 7

When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential danger from turbulent air currents will usually be encountered on the

Answer 7

leeward side when flying into the wind.

Question 8

Convective currents are most active on warm summer afternoons when winds are

Answer 8

light.