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114 - ATPL - In an Air Data Computer (ADC), aeroplane altitude is calculated from:

Question 114 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Measurement of outside air temperature (OAT)
The difference between absolute and dynamic pressure at the fuselage
Measurement of elapsed time for a radio signal transmitted to the ground surface and back
Measurement of absolute barometric pressure from a static source on the fuselage

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