Calculation of FL
I understand that FL can be derived from knowing ISA sea level T and standard T.
I have a formula (from a set of notes from a defunc but well respected organisation) which must contain a typo. Here it is
Std T = +15(2 x FL)
this formulae is then trnsposed to
FL[(47 + 15)/2]= 310!
When given the values Amb = - 45C
TDev = +2C
StdT = -47
Am I confused or what. Any help gratefully received