Originally Posted by 500 above
The East of the ATZ is what I am referring to. Not a squeeze at all
A 'standard route' of mine…the BNN222R…
Meaning that if Stapleford QNH is lower than London QNH, I have to keep my altitude even more accurately (27ft per mb)
UK IAIP ENR 1.7-2 Paras 5.1.6, 5.2.2.1 and 5.3.3
It may be assumed that for aerodromes beneath the same TMA or CTA the differences in their QNH values are insignificant.