Question: How could you calculate Density Altitude without using an E-6B (manual or electronic)?
Answer:
DA = FE + 1000 *(29.92 - QNH) + 120*(T-ST)
Where
DA = Density Altitude
FE = Field Elevation
QNH = Local altimeter setting
T = OAT in degrees centigrade
ST = standard tyemperature for the Pressure Altitude as derived from the first part of the equation (FE + 1000 *(29.92-QNH))
For instance, if
FE =2900 feet
QNH = 29.82
T = 26
PA = 2900 + 1000*(29.92-29.82) = 2900+100=3000
ST = 15-(3000/1000)*2=9
DA=PA + 120*(15-9)=3000+120*6=3720.
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