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WorksheetsPart 107 unit6
Total questions: 40
Worksheet time: 20mins
What is the standard air temperature and pressure at sea level?
15 degrees Celsius and Hg 29.92
What effect does high density altitude have on the efficiency of a UA propeller?
What is true altitude?
Which combination of atmospheric conditions will reduce aircraft
Low temperature, low relative humidity, and low density altitude
High temperature, low relative humidity, and low density altitude.
High temperature, high relative humidity, and high density altitude.
If the outside air temperature (OAT) at a given altitude is warmer than standard, the density altitude is
Density altitude is defined by
pressure altitude and ambient temperature.
What effect, if any, does high humidity have on sUAS performance
High humidity can decrease performance.
Which factor would likely increase density altitude?
An increase in ambient temperature
When is pressure altitude equal to density altitude?
On a standard day (15º C and 29.92” Hg
How would high density altitude affect the performance of a small unmanned aircraft?
It increases engine power and lift,
It reduces performance
You're operating a fixed-wing UA over barren ground on a hot day at low-altitude. You can expect to encounter
bumpy, turbulent air.
smooth, moist air
The condition between layers of wind moving in different directions is known as
There are many considerations when looking at wind. Which of the following is generally not a concern:
Tide pools
Where does wind shear occur?
low atmosphere
near ocean
At all altitudes*
When may hazardous wind shear be expected
In areas of low-level temperature inversion, frontal zones, and clear air turbulence
While operating around buildings, the Remote PIC should be aware of the creation of wind gusts that
Change rapidly in direction and speed causing turbulence
Moisture is added to air by
precipitation/condensation
evaporation/sublimation
Why is frost considered hazardous to sUAS operations?
If the temperature is 64°F (and if the temperature/dewpoint spread is too small and decreasing), what type of weather is most likely to develop?
What is "dewpoint"?
The temperature to which air must be cooled to become saturated.
The amount of water vapor which air can hold depends on the
Clouds, fog, or dew will always form when
water vapor condenses.
air saturated with water vapor and the temperature rises below the dew point
Low-level turbulence can occur (and icing can become hazardous)
Rain-induced fog
Steam fog
Advection fog will most likely form when
an air mass moves inland from the coast
Radiation fog will most likely form when
there is warm, moist air over low, flatland areas on clear, calm nights
Frost is most likely to form on a UAV's wings or propellers
The temperature and dew point are each forecasted to be 10°C. What weather should you expect?
In a METAR report, what does “BR” indicate?
.The thunderstorms that are generally the most hazardous to aircraft are
squall line thunderstorms
There's thunderstorm activity in the vicinity of your flight area. Which hazardous atmospheric phenomenon should you watch out for?
Wind-shear turbulence
A nonfrontal, narrow band of active thunderstorms that often develop ahead of a cold front is known as a
squall line
What conditions are necessary for a thunderstorm to form?
Which thunderstorm lifecycle stage is mostly characterized by downdrafts
updraft
Dissipating
What feature is typically associated with the cumulus stage of a thunderstorm?
Continuous updraft
What should you expect if you see lenticular clouds over a mountain?
Strong turbulence
Ceiling conditions (cloud base) can be calculated from
What is a characteristic of stable air?
Stratiform clouds
stable air mass is most likely to have which characteristic
poor surface visibility
An air mass moving inland from the coast in winter is likely to result in
rainy
Fog
What are characteristics of a moist, unstable air mass?
Turbulence and showery precipitation.
