Collins Bus Corporation (Collins) is recalling certain 2016 DH416 school buses manufactured February 18, 2016, to February 19, 2016 built on Ford chassis, and 2016 DE516 school buses manufactured January 18, 2016, to February 19, 2016 built on Chevrolet chassis. These vehicles are equipped with seats that may separate from the base frame due to bolt failure. As such, these seats fail to comply with the requirements of Federal Motor Vehicle Safety System (FMVSS) number 222, “School Bus Passenger Seating and Crash Protection.”