1013 – 1003 = 10hPa x 27 =
270ft
Altitude in ISA = 16,000 – 270 =
15,730ft
FL160
ISA = +15º -
(2º x 16)
= -17ºC
OAT = -27ºC
Deviation
= -10ºC
Temperature error = 4 x 15.7 x
10 = 628ft
True altitude
= 15,730 – 628 = 15,102ft