Originally Posted by
johnny5a
Just started showing my 2yo videos of planes when I stumbled upon piloteye.tv on youtube. He's already hooked (hopefully in 21 or so years time he will fly his parents somewhere :-) )
Anyway back to my Q, the videos are mainly LH aircraft, I noticed that the chitchat is in German but when they're going through check lists or given out commands to each other such as engine 3+4 start they say it in English.
is this a requirement to speak in English?
It is the international language used for aviation. Most aircraft manuals are in English and ATC will be English. You may get French pilots talking to french ATC in French though - for example.
Edit: Just beaten to it LOL!