atpl/oxford/met/ch8

Question 1

Maximum turbulence associated with the standing waves is likely to be:

Answer 1

Approximately one wavelength down wind of, and approximately level with, the top of the ridge.

Question 2

For the formation of mountain waves, the wind above the level of the ridge should:

Answer 2

Increase with little change in direction.

Question 3

When flying in IMC in a region close to a range of hills 2000 ft. high, in stable air and with wind direction at right angles to the axis of the range of hills, which of the following is probably the most dangerous practice:

Answer 3

Flying parallel to the hills on the downwind side at flight level 40.

Question 4

Which of the following statements referring to Jet Streams is correct:

Answer 4

CAT associated with Jet Streams is probably associated with the rapid wind shear in the vicinity of the jet.

Question 5

The significance of lenticular cloud is:

Answer 5

There are mountain waves present but they may not give severe turbulence.

Question 6

For standing waves to form, the wind direction must be near perpendicular to a ridge or range of mountains and the speed must:

Answer 6

Increase with height within a stable layer above the hill.

Question 7

A north/south mountain range, height 10,000 ft is producing marked mountain waves. The greatest potential danger exists for an aircraft flying:

Answer 7

above a line of clouds parallel to the ridge on the lee side at FL 25

Question 8

Clear air turbulence, in association with a polar front jet stream in the Northern Hemisphere, is more severe:

Answer 8

Looking downstream on the left hand side

Question 9

Mountain waves can occur:

Answer 9

In the stratosphere.

Question 10

CAT should be reported whenever it is experienced. What should be reported if crew and passengers feel a definite strain against their seat or shoulder straps, food service and walking is difficult and loose objects become dislodged:

Answer 10

Moderate CAT