When you enter a stationary gun (Mos Espa f.e.) which is already out of ammo you can no longer exit the gun. Btw, the inspace repair takes way too long, getting killed and get a new craft is much quicker.
The support ships weren't REALLY meant to repair fighters anyways man... They are meant to support the bigger ships with anti-fighter guns and repair. And if you are getting repaired from a Support ship, don't just sit there, do a few fly bys instead.
"Munchkin: One who, on being told that this is a game about politics and intrigue in 17th century Italy, asks to play a ninja." — Andrew Rilstone