This document covers a commercial, diesel engine driven, chassis-mounted, aircraft
boarding staircase, to be used for passenger loading and unloading. The deck height of the
staircase is adjustable to between 96 inches and 228 inches to accommodate B-707, B-727, B-
737, B-747, B-757, B-767, B-777, A-300, A-320, A-330, A-340 aircraft, and their military
derivatives.