Originally Posted by
Discorde
It would be helpful if the US adopted hPa, to avoid situations such as:
'American Jet, descend altitude two thousand, QNH nine nine eight.'
'Amjet, descend altitude two thousand . . . er . . . altimeter . . . QNH . . . two nine nine eight.'
A good example of why, in the UK at least, the correct phraseology is:-
"American Jet descend
to altitude 2000
feet QNH 998
hectopascals"