Chain is no longer chain. Chain is loop. The door of your plane is the hatch. The chain suspending your opened hatch is the hatch-loop. It is a skib.
Amateur pilots refer to skibs as hatch-handles, and are laughed at.
If your skib were gilt in brass, it'd still be a skib. The front of your plane is the nose. The back is the tail. Stand facing forward in your plane. Your right-hand side is your starboard side.