050.09 Flight Hazards

Question 1

Rime ice most commonly occurs in NS clouds in the temperature range (-10 to -30 / -7 to -13 / 0 to -25 / +5 to -10)°​C.

Answer 1

Rime ice most commonly occurs in NS clouds in the temperature range (-10 to -30)°C.

Question 2

Typical diameter of a tornado is (…)​.

Answer 2

Typical diameter of a tornado is (100 - 150 meters).

Question 3

A typical microburst lasts (…)​.

Answer 3

A typical microburst lasts (1 to 5 min).

Question 4

Clear ice is formed as a result of (large/small) super-cooled water droplets coming in contact with the aircraft surface.

Answer 4

Clear ice is formed as a result of (large) super-cooled water droplets coming in contact with the aircraft surface.

Question 5

During their life cycle, single-cell thunderstorms are moving according to the (…) hPa winds.

Answer 5

During their life cycle, single-cell thunderstorms are moving according to the (700) hPa winds.

Question 6

Tornadoes are most likely in (spring/summer/autumn/winter)​. (2 options)

Answer 6

Tornadoes are most likely in (spring and summer).

Question 7

The (…) is a signal of the beginning of the mature stage of a thunderstorm.

Answer 7

The (start of precipitation) is a signal of the beginning of the mature stage of a thunderstorm.

Question 8

When encountered, CB clouds should be avoided by (3000/4000/5000/6000) ft vertically and (5/10/15/25)​ NM horizontally.

Answer 8

When encountered, CB clouds should be avoided by (5000) ft vertically and (10) NM horizontally.

Question 9

A microburst is a concentraded downdraught with high speeds and a (higher/lower)​ temperature than the surrounding air.

Answer 9

A microburst is a concentraded downdraught with high speeds and a (lower) temperature than the surrounding air.

Question 10

Mixed ice most commonly occurs in NS clouds in the temperature range (-10 to -30 / -7 to -13 / 0 to -25 / +5 to -10)°​C.

Answer 10

Mixed ice most commonly occurs in NS clouds in the temperature range (-7 to -13)°C.

Question 11

The most effective measure to avoid CAT effects is (…)​.

Answer 11

The most effective measure to avoid CAT effects is (change of flight level).

Question 12

Vertical windshear is reported in (…)​.

Answer 12

Vertical windshear is reported in (kt / 100 ft).

Question 13

Concerning rotor waves, the wind direction at the (lower/upper)​ side of the rotors is opposite to the prevailing wind direction.

Answer 13

Concerning rotor waves, the wind direction at the (lower) side of the rotors is opposite to the prevailing wind direction.

Question 14

Rime ice is formed as a result of (large/small) super-cooled water droplets coming in contact with the aircraft surface.

Answer 14

Rime ice is formed as a result of (small) super-cooled water droplets coming in contact with the aircraft surface.

Question 15

Clouds will consist of supercooled water droplets when the temparture is between (…)°C and (…)°​C.

Answer 15

Clouds will consist of supercooled water droplets when the temparture is between (0)°C and (-15)°C.

Question 16

For hoar frost to form, the temperature of the surface is (higher/lower) than the dew point of the air an this dew point is lower than (…)°​C.

Answer 16

For hoar frost to form, the temperature of the surface is (lower) than the dew point of the air an this dew point is lower than (0)°C.

Question 17

Best time of the day to conduct a VFR flight over the Alps on a fine and hot summer day is (…)​.

Answer 17

Best time of the day to conduct a VFR flight over the Alps on a fine and hot summer day is (in the morning).

Question 18

Clear ice most commonly occurs in NS clouds in the temperature range (-15 to -30 / -7 to -13 / -10 to -25 / 0 to -10)°​C.

Answer 18

Clear ice most commonly occurs in NS clouds in the temperature range (0 to -10)°C.