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True Altitude - ATPL Navigation
flying
Topic Author
flying created the topic: True Altitude - ATPL Navigation
What formula do I work out to find true altitude? Appreciate your feedback on this.
Ben
Stuart Tait replied the topic: True Altitude - ATPL Navigation
Relationship of true and calibrated (indicated) altitude:
TA= CA + (CA-FE)*(ISADEV)/(273+OAT)
where
TA= True Altitude above sea-level
FE= Field Elevation of station providing the altimeter setting CA= Calibrated altitude= Altitude indicated by altimeter when set to the altimeter setting, corrected for calibration error.
ISADEV= Average deviation from standard temperature from standard in the air column between the station and the aircraft (in C).
OAT= Outside air temperature (at altitude)
Substituting:
FL170 represents a pressure altitude of 17,000 ft
We know that the OAT is -10°C
Indicated altitude is 17,500 ft
