In article ,
Wayne wrote:
I got there just at dark on Friday night, locked her up and left, the
line guy said he would have them fuel it up the next day. Came back Saturday
afternoon, around 4 and found my door open. Lock broken,

Wait, which door? I'm not familiar with the 175, but the standard Cessna
locking drill would be to reach across the plane (from whichever side
you're standing on) and latch the far door with the lever (which makes
it impossible to open from outside) then close and lock the door on your
side.

You said your girlfriend found it... Is it possible that the the door
you didn't lock just didn't get latched? Have you ever locked that side
from outside?

--
Ben Jackson

http://www.ben.com/