There are a couple of these in the
Exam system
. this one only requires a temperature
correction
. MOCA 8500ft is QNH
Temperature correction
. 4% per 10Ί
deviation from ISA
ISA at FL85 = -2Ί C, so temperature
condition is ISA-18 ΊC
Correction 7.2% from 8500ft to DATUM
(4000ft).
Datum in this instance is our met
station at 4000ft
7.2% x 4500 = 324ft
Is it plus or minus 324ft
high to
low careful go
temp is low
. +324ft
Answer 8824ft.
So - actual answer we will take 8800ft ..... the closest .... which you could argue is a little inconsistent, but never
mind!!!