TM 5-5420-278-10
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LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd)
INTERIOR BAY EQUIPMENT FEATURES
OUTER PONTON – A non-compartmentalized structure that functions as
a float to support loads placed on its top (walkway) surface, and provides
additional buoyancy to the inner ponton. Left and right outer pontons are
interchangeable.
ROADWAY – The top road surface of two adjoining inner pontons having
a 13 ft 5 in. (4.1 m) wide load bearing area for vehicles and cargo.
INNER PONTON – A non-compartmentalized structure that functions as a
float to support loads placed on its top (roadway) surface. Left and right outer
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 three stanchions and a cable mounted on each outer ponton
splash plate.
UNFOLDING MECHANISM – A system of cables, springs, and levers,
located at both ends of the IRB-I, that automatically control the unfolding of
the inner and outer pontons as the bay is launched. During retrieval, this
mechanism works in reverse by pulling the pontons up into the folded position
simultaneously, as the entire bay is lifted from the water via the transporter.
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