TM 5-5420-278-100003 000003 00-11DIFFERENCES BETWEEN MODELSThere are two models that make up the IRB, the Ramp Bay M16 and the InteriorBay M17. For differences between the M16 and M17, refer to WP 0003 00. Thereare no differences between individual units of the same model of the IRB interior orramp bays. The IRB is a redesigned and improved bridge that functions similar toits older Improved Float Bridge (IFB) counterpart. The IRB’s interior and rampbays can be interconnected with IFB bays.DIFFERENCES BETWEEN IRB AND IFBThe IRB has been designed to connect with IFB bays interchangeably, but thereare many significant differences in its appearance and operation. Table 1, below, isprovided to assist the operator in identifying IRB design features that differ fromthe IFB. Refer to WP 0006 00 for operation of IRB. Refer to TM 5-5420-209-12 foroperation of IFB.IRB ASSEMBLYDIFFERENCE IN CONFIGURATION FROM IFBRAMP BAYInner pontonNew structural design; ramp end is contiguous; nofolding ramp platesOuter ponton1. Redesigned; revised bow shape2. Raised splash plate3. Redesigned cleats4. Reinforced deck5. Redesigned load receiving recesses for redesigned rafting brackets, air-transport, and load retaining system.6. No retaining cable fixing strut7. No unfolding mechanism lever box8. No ramp plate lifting device fixing points or polesUpper coupling, Locking recesses removable and made of steellongitudinalUpper coupling, NonetransverseTravel latchNoneFoldlockNoneOuter ponton lockNew design; swivel hook actuated from deckUnfolding mechanism1. New design: torsion bar in outer ponton2. Redesigned unfolding lever/stabilizerTable 1. Differences Between IRB and IFB.
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