What was found
ANNUAL INSP, ALTERNATE AIR SOURCE DOOR WAS LOOSE. MECHANIC FOUND DOOR SPRING P/N 1250728-1, HINGE PIN P/N MS20253P2-364 IN INDUCTION AIR BOX DUCTING. PIN AND SPRING WERE RE-ASSEMBLED WITH DOOR. WHEN PARTS WERE RE-ASSEMBLED, BOTH UPPER AND LOWER ENDS OF HINGE WERE CRIMPED. CRIMPING BOTH ENDS OF HINGE DOES NOT ALLOW PIN TO FALL OUT, OVER TIME, ALLOW SPRING TO COME LOOSE. ABOUT A YEAR AGO, ENGINE INGESTED SPRING AND CAUSED ENOUGH DAMAGE TO NR 5 CYLINDER AND NR 5 PISTON TO HAVE THEM BOTH REPLACED. MFG MM IS VAUGE ON HOW TO ASSEMBLE THESE PARTS. CRIMPING BOTH ENDS OF THE HINGE WOULD ENSURE THAT THESE PARTS WILL NOT COME LOOSE AND NOT GET INGESTED INTO THE ENGINE.