Originally Posted by
Feather44
I remember this one from flight school.
Effect on ASI with pitot or static blocked: POCUD & SUCOD
Why is the drain hole not considered in these rules of thumb?
If the pitot is blocked but its drain hole is open - ASI falls to zero.
What happens if the drain is blocked but the pitot open? Presumably nothing changes until the pitot also gets blocked when you have a
POCUD situation.
What typically happens in real life? I might guess that in pitot freezing situations the drain hole blocks first then the pitot hole itself?