# At what altitude do flight levels begin?

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In the United States and Canada, Flight Levels are classified as Class A airspace and begin at FL180, (18,000 ft) and extend to FL600. The transition level between altitudes and Flight Levels differs by country, depending on the terrain and highest obstacles in that country.

## What altitude do flight levels start?

Flight Level (FL)

Strictly speaking a flight level is an indication of pressure, not of altitude. Only above the transition level (which depends on the local QNH but is typically 4000 feet above sea level) are flight levels used to indicate altitude; below the transition level feet are used.

## Why do flight levels start at 180?

Flight Level 180, or FL180, in the United States is known as the transition altitude. Depending on the local altimeter setting, FL180 can be unusable for ATC separation. Because of this, assigning FL180 always makes air traffic controllers double check the altimeter setting to ensure it’s usable.

## What is flight level 230?

it means to expect to climb to any altitude starting at 18,000 all the way up to 60,000. Any of the altitudes in those areas are Flight level 230 for 23,000 feet etc.

## What is the Quadrantal rule?

Minimum vertical separation between two flights abiding by the UK Quadrantal Rule is 500 ft (note these are in geopotential foot units). The level to be flown is determined by the magnetic track of the aircraft, as follows: Magnetic track 000 to, and including, 089° – odd thousands of feet (FL070, 090, 110 etc.)

## How cold is it at 35000 feet?

How cold is it up there? The higher you get, the colder it gets, up until 40,000 feet. If the temperature at ground level was 20C, at 40,000 feet it would be -57C. At 35,000 feet the air temperature is about -54C.

## Can a plane fly at 60000 feet?

Some aircraft can fly higher

Concorde has been the only significant exception amongst commercial aircraft. It could fly up to 60,000 feet due to the increased lift generated when flying at much higher speeds. At low altitudes, drag would prevent it from reaching its high speeds.

## What is the highest flight level?

Question: What is the highest altitude an airplane can fly? Answer: The highest commercial airliner altitude was 60,000 feet by Concorde. The highest military air-breathing engine airplane was the SR-71 — about 90,000 feet. The highest airliner flying today reaches 45,000 feet.

## What is FL210?

FL210 is wherever you happen to find yourself in space with your altimeter set to 29.92 (standard barometric pressure) and reading 21,000′. … In the US, this is 18,000″ Transition level, is the FL at which, when descending, you reset your altimited to QNH, or the local altimeter setting.

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## Why is 29.92 the standard altimeter setting?

Above 18,000 MSL pilots set the altimeters to 29.92. … In this case, having all airplanes use a common altimeter setting is useful because it doesn’t require pilots to change it frequently as they pass through changes in pressure, and it also helps ATC ensure separation without having to inform flights of a new setting.

## How high do planes fly in KM?

Plane facts and figures

Aircraft type Speed in km/u* Altitude in ft*
Boeing 737 850 35,000
Boeing 777 905 35,000
Boeing 787 Dreamliner 907 40,026
Embraer 190 829 39,370

## How high do domestic flights fly?

According to USA Today, the common cruising altitude for most commercial airplanes is between 33,000 and 42,000 feet, or between about six and nearly eight miles above sea level. Typically, aircraft fly around 35,000 or 36,000 feet in the air.

## What is the transition level?

The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes. Transition Level. The lowest flight level available for use above the transition altitude. Transition Layer. The airspace between the transition altitude and the transition level.

## How high can I fly VFR?

An aircraft must maintain an altitude of 500 feet above the surface, except over open water or sparsely populated areas. In those cases, the aircraft may not be operated closer than 500 feet to any person, vessel, vehicle, or structure.

## Can a VFR pilot fly above clouds?

“The short answer is yes. You may legally fly on top as long as you can maintain the appropriate VFR cloud clearances. … The only regulatory restriction is that student pilots are not allowed to fly above a cloud layer without ground reference.

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## Where can you fly below sea level?

Located at 1,240 ft (378 m) below mean sea level, Bar Yehuda Airfield is the lowest airport in the world.