What was found
UPON EXTENDING THE GEAR FOR LANDING, AFTER THE MAIN GEAR WERE DOWN & LOCKED, THE INBD MAIN GEAR DOORS FAILED TO STOW AND REMAINED OPEN DURING THE LANDING & TAXI, SCRAPING THE PAVEMENT & CAUSING DAMAGE TO THE LE CORNERS OF THE MAIN INBD GEAR DOORS. CAUSE OF THE MAIN INBD DOORS NOR SEQUENCING CLOSED AFTER MAIN GEAR EXTENSION IS NOT KNOWN AT THIS TIME & IS UNDER INVESTIGATION. APPROX A 3" X 3" AREA OF THE LE CORNER OF BOTH MAIN GEAR INBD GEARS DOORS WAS WORN OFF WHERE THE DOORS CONTACTED THE PAVEMENT. THE LANDING & TAXI WERE UNEVENTFUL EXCEPT FOR THE WEAR NOTED ON BOTH INBD DOORS.