True Air Speed: The speed of an aeroplane through the air in which it is flying, corrected for errors in Indicated Air Speed and contrasted with ground speed.
Calculate true air speed (TAS):
Determine pressure altitude and check density altitude
Use aircraft performance charts or the E6B / Jeppesen flight computer to estimate / calculate TAS
Density Altitude Chart ...
TAS - True Air Speed. Because an air speed indicator indicates true air speed only under standard sea-level conditions, true air speed is usually calculated by adjusting an Indicated Air speed according to temperature, density, and pressure.
KTAS
Knots True Air Speed (KTAS). TAS, in knots.
KVSF
Velocity error scale factor (KVSF) ...
CAS is equal to true air speed in standard atmosphere at sea level. See also TRUE AIR SPEED and INDICATED AIR SPEED.
From 12,000' a C-150's 70 mph indicated is only 84 true air speed. Power off sink rate is 870 fpm reducing to 725 at sea level. Another 20% of glide distance can be obtained by pulling into a near stall and stopping the propeller.
 See also: Aircraft, Plane, Power, Landing, Speed
  
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