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Altitude: Difference between revisions
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→Flight level: disallow GPS altitude
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*[[#Pressure altitude]] divided by 100 is referred to as the flight level. | *[[#Pressure altitude]] divided by 100 is referred to as the flight level. | ||
It 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). When the [[altimeter]] reads 18,000 ft on the standard pressure setting the aircraft is said to be at "Flight level 180" or FL180. | It 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). When the [[altimeter]] reads 18,000 ft on the standard pressure setting the aircraft is said to be at "Flight level 180" or FL180. | ||
To assure vertical separation [[IFR]] pilots are required to use the altimeter. It is not allowed to use the height measured by GPS systems. | |||
==Density altitude== | ==Density altitude== | ||