What was found
(CAN) A POST FLIGHT INSPECTION BY FLIGHT CREW REVEALED A DENT IN THE MAIN CABIN DOOR. THE CAUSE WAS A BROKEN CABLE WHICH IS SPRING LOADED TO CLOSE THE STEPS WHEN THE DOOR IS IN THE CLOSED POSITION. THE CABLE FAILED AND THE SPRING BROKE OUT OF IT`S BRACKET UPON FAILURE. THE DENT WAS CAUSED BY THE MS20668 TERMINAL END FROM THE BROKEN END OF THE CABLE WHICH SPRUNG DOWN AND CONTACTED THE DOOR SKIN. A DOUBLER ON THE SKIN ACTUALLY. THE CABIN DOOR IS ON AN ACCELERATED, DETAILED INSPECTION PROGRAM DUE TO THE ACFT`S USE AS AN AIR AMBULANCE AND THE RESULTING LOADS PLACED ON IT. THESE CABLES ARE REPLACED FREQUENTLY DUE TO WEAR BUT THIS ONE FAILED PREMATURELY AND IN AN UNUSUAL MANNER. THE DENT IN THE DOOR WAS MINOR AND WAS EASILY REPAIRED.