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Derive or compute TAS, given IAS, pressure altitude and air temperature in degrees Celsius.
To Find the TAS you will need the following:
- Pressure Altitude
- OAT (Outside Air Temperature)
- CAS or IAS
(Use CAS if it is available, otherwise use IAS)
Example one.
Question:
Given CAS 110 knots, P.alt 18'000 feet, OAT 15ºC what is the TAS
Method:
Using airspeed window set temp against OAT
Find CAS on inner scale
Read off TAS opposite on outer scale
Answer:
TAS 156 knots
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