Hello, I have a question.
I have Pitot heat ON but after 15 mins at 10 000M the Pitot tube gets frozen.
Similar situation is at 7 000 M, gets frozen after circa 20- 25 mins. I have to descend to 4 or five thousand and instruments start indicate again.
Isn't it strange ? Did I miss anything?
I believe that pilots in those times spent more time than 15 mins at high altitude.
Have a nice day