China Civil UAV Theory Questions — Questions 651–660

UAV-Q0651. When encountering aircraft icing in flight, the pilot should pay attention to ________

Explanation

When icing occurs, handle the aircraft gently, maintain attitude and altitude, and leave the icing area as soon as possible, avoiding abrupt maneuvers that could cause danger.

UAV-Q0652. During the day, under solar radiation, rocky ground, sand, and urban areas warm faster than water, grassland, forest, and rural areas. Air above them becomes warmer than surrounding air, expands, decreases in density, and rises as buoyancy exceeds gravity. This phenomenon causes ( )

Explanation

Vertical air motion caused by ground thermal property differences is a thermal convective lifting force.

UAV-Q0653. Which airflow benefits long-endurance UAV flight?

Explanation

Stable rising airflow provides extra lift for UAVs, reducing their own power consumption and aiding long flights at medium and high altitudes. Headwinds increase flight resistance and power consumption. Stable descending airflow makes UAVs descend, which does not help long flights at medium and high altitudes.

UAV-Q0654. In poor-visibility weather, wind is generally ( )

Explanation

When wind is weak, air moves slowly, and pollutants and water vapor do not disperse easily, so visibility is poor; strong wind improves visibility.

UAV-Q0655. The Coriolis force deflects airflow to the right, so between 30 degrees north latitude and the equator, trade winds blow from which direction?

Explanation

Air masses move from the subtropical high-pressure belt toward the equatorial low-pressure belt (north to south in the Northern Hemisphere) and, deflected right by the Coriolis force, form northeast trade winds.

UAV-Q0656. Under which conditions is wind shear easily encountered?

Explanation

Inversion layers block vertical air motion and easily trigger wind shear; airflow around thunderstorms is also complex and easily produces wind shear. High wind speed or high pressure does not necessarily mean wind shear.

UAV-Q0657. When flying in valleys, the measures to take are ( )

Explanation

Windward slopes have relatively stable airflow, while leeward slopes easily develop turbulence; turning immediately after exiting a mountain pass is dangerous, so fly near the windward slope.

UAV-Q0658. When taking off or landing at an airport at the edge of a thunderstorm area, the dangerous weather to particularly watch for is ( )

Explanation

Thunderstorm edges easily produce strong airflow changes, causing low-level wind shear, a major takeoff and landing safety threat.

UAV-Q0659. Most current civil UAVs operate in which atmospheric layer?

Explanation

Most current civil UAVs fly at altitudes from several hundred to several thousand meters, within the troposphere. Note the difference from airliner cruise layers.

UAV-Q0660. The gust with the greatest impact on aircraft flight safety is

Explanation

Gusts perpendicular to flight direction (such as microburst downdrafts) cause sudden aircraft climbs and descents, upsetting lift balance and possibly causing stalls, with the greatest impact.