What was found
EN ROUTE, THE GEAR UPLATCH CHECK FAILED WITH THE GEAR NOT LATCH WARNING LIGHT ILLUMINATED, DOOR NOT LATCH REMAINED EXTINGUSHED. THE FLIGHT CONTINUED TO TOL FOR AN UNEVENTFUL LANDING. MAINTENANCE JACKED THE AIRCRAFT AND PERFORMED GEAR SWING, WHICH REVEALED THE LEFT MAIN CENTER GEAR DOOR NOT FAIRING PROPERLY. MAINTENANCE ADJUSTED THE CENTER GEAR DOOR IN ACCORDANCE WITH THE DOUGLAS MAINTENANCE MANUAL. A SUCCESSFUL GEAR SWING, RETURNED THE AIRCRAFT TO SERVICE.