Kai Rode wrote in
:

There is a signal field between the operations building and the
runway, even if there is no tower.


So the airport MUST have an operations building?

Yes it does. Even if it's just a beach chair as at this airfield:

http://tinyurl.com/5m4js4

http://de.wikipedia.org/w/index.php?...20050822072716


That's what the regulations say..I didn't write them.