Flight Level (FL) Altitude above sea-level in 100 feet units measured according to a standard atmosphere. Strictly speaking a flight level is an indication of pressure, not of altitude.

Moreover,Â  How do planes determine altitude?

Absolute altitude refers to the actual distance the aircraft is flying in relation to the ground and is expressed in â€śfeet above ground level.â€ť This type of altitude is generally determined using a radar altimeter, which measures how long it takes radar signals to reach the ground and reflect up to the plane.

In respect to this, Is airplane altitude measured from sea level?

Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. … Absolute altitude is the vertical distance of the aircraft above the terrain over which it is flying. It can be measured using a radar altimeter (or “absolute altimeter”).

How does a pilot find out the altitude at which he should fly?

Answer: The flight operator files a requested altitude, usually done by the flight dispatcher, based on performance and economics. Air traffic control reviews the flight plan, checking for conflicts. They issue the cruising altitude based on the requested flight plan and other traffic.

Furthermore,Â Why is altitude measured above sea level?

Sea level is the base level for measuring elevation and depth on Earth. Because the ocean is one continuous body of water, its surface tends to seek the same level throughout the world. … Sea level is measured in relation to the adjacent land. Just like the ocean, the elevation of land may rise and fall over time.

## How do you measure altitude above sea level?

An altimeter is a device that measures altitudeâ€”a location’s distance above sea level. Most altimeters are barometric, meaning they measure altitude by calculating the location’s air pressure. Air pressure decreases as altitude increases.

## Why do planes fly at 35000 feet?

The â€śsweet spotâ€ť of flying is regarded as between 35,000 and 42,000 feet â€“ too high and the oxygen becomes too sparse to fuel the engines, too low and the air resistance is greater. This optimum height is linked to the usual weight of a commercial jet â€“ that is, heavier planes fly lower, and lighter higher.

## What do you mean by above sea level?

The term above mean sea level (AMSL) refers to the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level datum.

## How are planes measured?

In an aircraft the speed is “measured” with a pitot tube. Together with the static pressure one can determine not the speed of the aircraft, but the speed of the air flowing around the aircraft, the airspeed. Thus the speed of the aircraft relative to the airmass it is flying in.

## Why do pilots prefer to fly at 36000 feet?

The biggest reason for this altitude lies with fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak. Spending less on fuel is also great for airlines, for obvious reasons.

## What is the mean altitude of planes above the sea level?

Pressure altitude divided by 100 feet (30 m) is the flight level, and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions); so when the altimeter reads 18,000 ft on the standard pressure setting the aircraft is said to be at “Flight …

## Why do planes fly at 37000?

Commercial planes traveling northeast, east, southeast and one degree short of south always fly at odd altitudes (33,000 feet, 37,000 feet, etc.). … Planes traveling in the same direction fly 2,000 feet above or below other planes near them, to ensure they don’t collide or even get near each other.

## How do planes measure altitude?

A radar altimeter measures altitude more directly, using the time taken for a radio signal to reflect from the surface back to the aircraft. … The radar altimeter is used to measure height above ground level during landing in commercial and military aircraft.

45,000 feet

## Can you fly below sea level?

Flying below sea level is obviously a pretty rare occurrence for a plane in good working order, so it’s perhaps unsurprising that the navigation systems stopped working. The lowest airfield in North America, for the record, is Furnace Creek Airport, Death Valley at minus 210 feet below sea level.

## Why are mountain heights measured from sea level and not from ground level?

However, winds, currents, river discharges, and variations in gravity and temperature prevent the sea surface from being truly level. So that the surface of the ocean can be used as a base for measuring elevations, the concept of “local mean sea level” has been developed.

## Can a plane fly over Mount Everest?

Airplanes often avoid air paths that take them over Mt Everest or the Pacific Ocean. … This is because “the Himalayas have mountains higher than 20,000 feet, including Mt Everest standing at 29,035 feet. However, most commercial airplanes can fly at 30,000 feet.”Feb 5, 2020

## What does mean sea level mean in aviation?

In meteorology, mean sea level is used as the reference surface for all altitudes in upper-atmospheric work; in aviation it is the level above which altitude is measured by a pressure altimeter. Along with mean high water, mean low water, and mean lower low water, mean sea level is a type of tidal datum.

## Why do planes fly at 41000 feet?

The high altitude is because the air is thinner, meaning planes can travel easier and quicker, saving money. Planes flying higher also means avoiding air traffic as well as bad weather conditions. In the case of an emergency, it also gives more time to fix the problem when thousands of feet in the air.

## What it means by above sea level?

The term above mean sea level (AMSL) refers to the elevation (on the ground) or altitude (in the air) of any object, relative to the average sea level datum.