Part 107 Weather Review

Which of the following is NOT a factor that can greatly influence sUAS performance and risk management?

• Atmospheric pressure and stability

• Wind and currents

• Type of sUAS battery used

• Precipitation

What is the major source of all weather?

• The moon

• The sun

• The ocean

• The Earth's core

Why does less atmospheric heating take place at the poles compared to the equator?

• The sun is farther from the poles

• Sunrays are more concentrated at the poles

• Sunrays are less concentrated over a larger area at the poles

• The poles have more vegetation

Which of the following surfaces is most likely to result in updrafts due to radiating a large amount of heat?

• Water

• Trees

• Plowed ground

• Grass

How can wind and currents affect sUAS performance during flight?

• They have no effect on sUAS performance

• They can affect performance and maneuverability in all phases of flight

• They only affect performance during takeoff

• They only affect performance during landing

What is a potential danger of obstructions on the ground with respect to wind?

• They always block the wind completely

• They can create rapidly changing wind speed and direction

• They have no effect on wind

• They make wind predictable

Why do convective currents pose a risk to remote PICs operating sUAS at low altitudes?

• They make the air colder

• They can cause turbulent air that affects control of the aircraft

• They improve visibility

• They reduce precipitation

What effect can high winds have on maintaining a geographical position in flight for an unmanned aircraft?

• They make it easier to maintain position.

• They may make it difficult to maintain position and consume more battery power.

• They have no effect on flight.

• They always improve aircraft control.

When operating close to a building, what can winds blowing against the building cause?

• Downdrafts that sink the aircraft.

• Updrafts that can result in ballooning or loss of positive control.

• No effect on the aircraft.

• Only turbulence with no change in altitude.

What happens to the wind as it flows down the leeward side of a mountain?

• It becomes less turbulent and slows down.

• It follows the contour of the terrain and becomes increasingly turbulent.

• It stops completely.

• It always creates updrafts.