What was found
AFTER DEPARTURE UPON SELECTION OF GEAR UP THE LEFT MAIN LANDING GEAR REMAINED EXTENDED. TOWER FLYBY CONFIRMED SINGLE LEG EXTENSION. THE DECISION WAS MADE TO DIVERT TO LISBON PORTUGAL FOR BETTER AVAILABILITY OF SERVICES. THE AIRCRAFT DIVERTED AND LANDED WITHOUT FURTHER INCIDENT THOUGH AN EMERGENCY WAS DECLARED AS A PRECAUTION. UPON EXAMINATION OF THE LEFT MAIN LANDING GEAR, IT WAS NOTED THAT THE AFT SECTION OF THE INBOARD GEAR DOOR WAS HANDING DOWN SEVERAL INCHES. EXAMINATION REVEALED THAT THE HANGAR THAT THE SECURED THE GEAR DOOR ARM TO THE FUSELAGE HAD FRACTURED AT BOTH ATTACH LUGS.