Originally Posted by
UWGGair
True Altitude Calculation
Hello
Could you please provide some assistance with the following question?
Altimeter reading 4500 FT, OAT 20°C, calculate the true altitude... has it got anything to do with pressure or density altitudes?
They've given you the OAT at 4500ft which means it's an ISA deviation question. You know what the ISA temp is at sea Level (15C) so you work out the ISA deviation then use the formula 4 x Indicated Alt in 1000's of feet x the ISA Deviation to calculate the height error.