THE PLANE LOCK

For Cessna C-172-210s, except for the C-177. Prevents the wind from popping your doors open and provides an added measure of security against break-ins.
No tools or STC required. From outside the aircraft, the pilots door is locked by reaching through the window ( prior to closing it) and pushing down the door safety handle. Then, slip the Plane Lock over the window sill and lock the window shut.