Turtle Top is recalling certain model year 2010 through 2012 commercial buses manufactured from April 1, 2011, through March 25, 2012, equipped with Specialty Manufacturing (SMI) Prolo roof hatches. Increased friction between the rear plate assemblies, p/no. 009327, and the nylon rear pop-up support, p/no. 008956, may result in an opening force of the Prolo roof hatches that exceeds federal standard requirements. Thus, these hatches fail to conform to the requirements of Federal Motor Vehicle Safety Standard No. 217, “Bus Emergency Exits and Window Retention and Release.”