The hangar spawn is bugged on some maps since they moved the hangars around with the last patch. I know in the TA (a4?) the hangar spawns you into the side of a hangar, you're stuck with your nose in the wall.
Stegahorse,
The hangar spawn on landing is caused by holding down the spacebar at the same time you hit the tower button with your mouse. It's usually because you're in a rush about to be vulched on landing.