Hi all,
I going through the books trying to find the answer to a question and am struggling.
At what altitude does the Mach meter come alive and you fly Mach number instead of IAS and you monitor MMO rather than VMO?
Whats is it that causes the cross over? I remember from my MCC when the Mach meter springs to life you fly that and ignore the ASI but I cant for the life of me recall the factors involved. Altitude? OAT? air density? All of them? I seem to recall 26000ft for some reason....
Thanks in advance and apologies if this has been covered before but I couldn't find it by searching
