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TDZE is the altitude of the runway above mean sea level.

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Q: What is the definition of touch down zone elevation TDZE?
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What is the definition of touch down zone elevation?

TDZE is the altitude of the runway above mean sea level.


What is the definition of a flat road?

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What is the difference between FIELD ELEV and ELEV on the airport diagram?

This is somewhat difficult for the non flying person to grasp -Most airports world wide are NOT flat and are certainly not at zero feet above sea level as they will be under water at some point.However, "the Field Elevation" on the Airport chart references the Airport Elevation. The Federal Aviation Administration(FAA) defines the Airport Elevation as the highest point of an airport's usable runways and is measured in height above mean sea level.This is very important as when you are landing you will know that your altimeter (the device saying how high you are) will say your height above sea level If the airports landing zone is 1500 feet elevation (above sea level) You must expect the aircraft not to land on zero feet but at 1500 feet - if you are expecting zero then you will hit the ground at about 160 knots and descending at about 800 feet a minute (normal airliner speeds) - it's basically a crash.On the chart the elevation is shown for both ends of each runway as they may very well be at differing heights.When referring to Field elevation or elevation in most respects they are the same "highest point of an airport's usable runways and is measured in height above mean sea level. "Now the confusing bit. The Elevation (highest point of an airport's usable runways and is measured in height above mean sea level. ) might not be at the point where an aircraft will touch down (TDZE) or Touch-down Zone Elevation. That would be shown separately. Why? The area just beyond the numbers on the runway are the Touch Down Zones (the bit the pilot aims for) That area could be at example 430 feet above sea level yet the centre of the runway 3000 feet away could be at 600 feet above sea level . (landing up hill) - The pilot needs to be aware of these points as their altimeter will be at 430 feet (touch down) missing that Touchdown area and lading at 3000 feet further down the runway means the ground is coming UP under you as you descend. Bit a bump when you hit.


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