Takeoff Performance
Performance Margins with ATM (assumed temperature method)
True airspeed effect (TAS EFFECT)
TAS is affected by OAT. IAS is based on air pressure difference in the pitot static system. Due to a higher air density at low OAT, a slower airflow is sufficient to generate the pressure difference needed to reach a given IAS, resulting in a
lower TAS. The opposite is true for a high OAT.
-> When assuming a higher than actual OAT, the resulting takeoff performance is based on a higher TAS, but the actual TAS will be lower (because the actual OAT is lower).
Can we say GS = TAS
Last edited by Driver 170; 7th Jun 2016 at 23:24.