TM 5-5420-278-24&P0003 000003 00-4LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd)INTERIOR BAY EQUIPMENT FEATURES:OUTER PONTON – A non-compartmentalized structure that functions as a float to support loadsplaced on its top (walkway) surface, and provides additional bouyancy to the inner ponton. Left andright outer pontons are interchangeable.ROADWAY – The top road surface of two adjoining inner pontons having a 13 ft 6 in. (4.1 m) wideload bearing area for vehicles and cargo.INNER PONTON – A non-compartmentalized structure that functions as a float to support loadsplaced on its top (roadway) surface. Left and right inner pontons are interchangeable.WALKWAY – The 4 ft 3 in. (1.3 m) wide top surface of the outer ponton for personnel crossing.HANDRAIL – A retractable railing, extending the full length of the bay, consisting of threestanchions and a rope mounted on each outer ponton splash plate.UNFOLDING MECHANISM – A system of cables, springs, and levers, located on both ends of theIRB-I, that automatically control the unfolding of the inner and outer pontons once the bay islaunched. During retrieval, this mechanism works in reverse by pulling the outer pontons up into thefolded position simultaneously, as the entire bay is lifted from the water via the transporter.ACDEFB
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