BLUE BIRD HAS NOTIFIED NHTSA ABOUT A DEFECT IN CERTAIN MODEL YEAR 2008 THROUGH 2011 ALL AMERICAN, CONVENTIONAL, AND MICRO BIRD SCHOOL BUSES MANUFACTURED FROM DECEMBER 13, 2007 THROUGH JANUARY 18, 2010 EQUIPPED WITH RICON MODEL S OR K SERIES PUBLIC USE WHEELCHAIR LIFTS. THE RESTRAINT BELT ON THESE LIFTS WAS DESIGNED TO PREVENT THE LIFT FROM MOVING, UNLESS THE TONGUE OF THE BELT IS FULLY ENGAGED AND LATCHED IN THE BUCKLE. RICON HAS DISCOVERED, HOWEVER, THAT IT IS POSSIBLE FOR THE OPERATOR TO INSERT THE BELT TONGUE INTO THE BUCKLE WITHOUT FULLY ENGAGING THE LATCHING MECHANISM. IN THIS CASE, THE RESTRAINT BELT WOULD APPEAR TO BE LATCHED, AND THE OPERATOR COULD RUN THE LIFT. IF THE RESTRAINT BELT TONGUE IS NOT FULLY ENGAGED INTO THE RESTRAINT BELT BUCKLE, AND LATCHED, THE LIFT MAY OPERATE WITH AN OCCUPANT ON THE PLATFORM.