LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES - TM-5-5420-278-24P_23

RAMP BAY EQUIPMENT FEATURES (CONTD)

TM-5-5420-278-24P Common Bridge Transporter (CBT) M1977 and Bridge Adapter Pallet (BAP) M15 Manual
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TM 5-5420-278-24&P 0003 00 0003 00-2 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS Major components and equipment features of the IRB-R and IRB-I are identified and described below. Locate the desired component by matching its description callout with the corresponding illustration callout on the opposite page. RAMP 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 bouyancy to the inner ponton. The outer ponton contains a stowage compartment for equipment and tools. Left and right outer pontons are not interchangeable. STOWAGE COMPARTMENT – A compartment in each outer ponton (ramp bay only) between the walkway and splash plate for holding the Basic Issue Items (BII) necessary for IRB operation. The following items and BII items can be stowed on the ramp bay: (1) Two ropes for securing bay (2) Two hand levers for operation of pumps (3) IRB hoisting gear (lifting sling) for high-bank launch (4) Spare Chem-lite tubes (5) Roadway tool for closing gap between inner-to-inner pontons (6) Crowbar for use with roadway tool (7) 19-mm wrench for removing ponton drain plugs (8) Coupling device for bay-to-bay connection RAMP PLATES – The two plates mounted on the outer pontons used to increase the width of the roadway approach ramp. ROADWAY – The top road surface of two adjoining inner pontons having a 13 ft 6 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. The inner ponton contains a pump and cylinder. Left and right inner pontons are not 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 two stanchions and a cable mounted on each outer ponton splash plate. UNFOLDING MECHANISM – A system of cables, levers, and torsion bars located at the rear of the IRB-R, that automatically control the unfolding of the inner and outer pontons once the bay is launched. During retrieval, this mechanism works in reverse by pulling the outer pontons up into the folded position simultaneously, as the entire bay is lifted from the water via the transporter. RAISING MECHANISM – The pump, cylinder, and yoke assembly, contained on each of the two inner pontons, used for raising and lowering the ramp bay. A B D C E F G H I

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