Part 107 Weather

Question 1

Standard air temperature and pressure at sea level

Answer 1

15 degrees Celsius at 29.92 inches of Mercury

Question 2

The height an object is at above ground level. That is, you could be at 2000 feet MSL but when you’re drone is still on the ground, you and the drone are at 0 AGL.

Answer 2

Absolute altitude

Question 3

The height of an object or location above MSL. It is the actual level above sea level you and your drone are at. So if you are launching at 2000 feet MSL then 2000 feet MSL Is your….altitude

Answer 3

True altitude

Question 4

The height or altitude your altimeter displays. Regarding drone flight, most altimeters assume you are at sea level under standard conditions, where ——— altitude is the same as true altitude

Answer 4

Indicated altitude

Question 5

The indicated altitude when the barometric pressure scale is set to 29.92 inches of Mercury. It doesn’t determine temperature

Answer 5

Pressure altitude

Question 6

The pressure altitude corrected for non standard temperature. The altitude that we’ve said that the drone feels like it’s flying

Answer 6

Density altitude

Question 7

A hot humid day would have this affect on an drone

Answer 7

May accelerate more slowly or may need to move faster making it more difficult for the drone to climb

Question 8

What type of air does high density altitude refer to

Answer 8

Thin air

Question 9

What type of air does low density altitude refer to

Answer 9

Dense air

Question 10

You will experience reduced aircraft performance in what type of density altitude

Answer 10

High density altitude

Question 11

You will have stronger performance in what type of density altitude

Answer 11

Lower density altitude

Question 12

Higher density altitude means thinner air and results in ————drone performance

Answer 12

Reduced drone performance

Question 13

Lower density altitude means thicker dense air and ————- performance

Answer 13

Stronger

Question 14

The climb performance of an drone ————— with altitude

Answer 14

Diminishes with altitude

Question 15

———/- currents are the forces that cause bumpy turbulent air when flying at lower altitudes during warmer weather

Answer 15

Convective currents

Question 16

Every change in weather is the direct result of

Answer 16

A heat exchange

Question 17

Stable air tends to produce

Answer 17

Stratiform clouds
Smooth air
Fair to poor visibility with haze and smoke
Continuous precipitation

Question 18

Unstable air tends to produce

Answer 18

Cumuliform clouds
Turbulent air
Good visibility
Showery precipitation

Question 19

Air mass that brings cool dry air. It forms over ———regions

Answer 19

Polar air mass

Question 20

An air mass that brings warm moist air. It forms over ———- waters

Answer 20

Tropical air mass

Question 21

Air mass that causes good surface visibility but has turbulence, cumulus clouds, and showers

Answer 21

Unstable air mass

Question 22

This weather front brings low ceilings, poor visibility, and rain, move slowly

Answer 22

Warm front

Question 23

This weather front brings sudden storms, gusty winds, turbulence, and sometimes hail or tornadoes , move quickly

Answer 23

Cold front

Question 24

———- can occur at any altitude. Can affect flight at any altitude

Answer 24

Wind shear

Question 25

The changing of liquid water to water vapor is called

Answer 25

Evaporation

Question 26

The changing of ice to water vapor bypassing the liquid stage is

Answer 26

Sublimation

Question 27

These are the most dangerous type of cloud appearing individually or in groups as either air mass or orographic thunderstorms . Think marshmallows

Answer 27

Cumulonimbus clouds

Question 28

Nimbus means

Answer 28

Rain

Question 29

These clouds are formed by barriers in the wind flow and are most prevalent around mountaintops. Often called standing clouds. They are good indication of strong turbulence and should be avoided

Answer 29

Lenticular

Question 30

What is the most violent time of a thunderstorms life cycle

Answer 30

Mature stage

Question 31

You must operate at least ——-feet below clouds

Answer 31

500 feet

Question 32

How to reach the cloud base AGL

Answer 32

Temperature minus dew point is spread. Divide the spread by 4.4 if temperatures are in farenheit or 2.5 if temps are in Celsius and then multiply by 1000 for the cloud base AGL

Question 33

What is a characteristic of stable air? Cumulus nimbus clouds Stratiform clouds Unlimited visibility

Answer 33

Stratiform clouds

Question 34

What are the characteristics of a moist unstable air mass? Poor visibility and smooth air Cumuliform clouds and showery precipitation Stratiform clouds and showery precipitation

Answer 34

Cumuliform clouds and showery precipitation

Question 35

If an unstable air mass is forced upward what type of clouds can be expected? 1) clouds with considerable vertical development and associated turbulence 2) cumulus clouds with little vertical development 3) stratus clouds with considerable associated turbulence

Answer 35

Clouds with considerable vertical development and associated turbulence

Question 36

A stable air mass is likely to have which characteristic Turbulent air Showery precipitation Poor surface visibility

Answer 36

Poor surface visibility

Question 37

Moisture is added to air by Evaporation and sublimation Evaporation and condensation Sublimation and condensation

Answer 37

Evaporation and sublimation

Question 38

Which combination of atmospheric conditions will reduce aircraft takeoff and climb performance? 1) high temperature, low humidity, low density altitude 2) high temp, high humidity and high density altitude 3) low temp, low humidity, and low density altitude

Answer 38

High temp, high humidity, high density altitude

Question 39

What effect does high density altitude have on a propeller? 1) efficiency is increased 2) density altitude does not effect propeller efficiency 3) propeller efficiency is decreased

Answer 39

Propeller efficiency is decreased

Question 40

Generally for aircraft the most hazardous kind of thunderstorm is Stratiform thunderstorm Squall line thunderstorm Warm front thunderstorm

Answer 40

Squall line thunderstorm

Question 41

What should you expect if you see lenticular clouds over a mountain? Light to moderate precipitation Strong turbulence The beginning of a thunderstorm

Answer 41

Strong turbulence

Question 42

Which is formally defines as “pressure altitude corrected for nonstandard temperature variations” True altitude Pressure altitude Density altitude

Answer 42

Density altitude

Question 43

What is the indicated altitude when your altimeter is set to 29.92 Density altitude Indicated altitude Pressure altitude

Answer 43

Pressure altitude

Question 44

What is the standard air temperature and pressure at sea level? 32 degrees Celsius and 30.00 hg 15 degrees Celsius and 29.92 hg 98.6 degrees

Answer 44

15 degrees Celsius and 29.92 hg

Question 45

In a metal report what does BR indicate

Answer 45

Must

Question 46

TAFs are typically valid for

Answer 46

24 or 30 hour time period

Question 47

To obtain a complete weather overview for a planned flight the remote pilot in command should obtain

Answer 47

Standard briefing

Question 48

Which weather service provides current recorded weather information

Answer 48

ATIS automated weather reporting