TM 5-5420-278-24&P0003 000003 00-6DIFFERENCES BETWEEN MODELSThere are no differences between models for individual units of the IRB interior or ramp bays. The IRBis a redesigned and improved bridge that functions similar to its older Improved Float Bridge (IFB)counterpart. The IRB’s interior and ramp bays can be interconnected with IFB bays.DIFFERENCES BETWEEN IRB AND IFBThe IRB has been designed to connect with IFB bays interchangeably, but there are many significantdifferences in its appearance and operation. The following list is provided to assist maintenance personnelin identifying IRB design features that differ from the IFB. Refer to TM 5-5420-278-10 for operation of IRB.Refer to TM 5-5420-209-12 for operation of IFB.DIFFERENCE IN CONFIGURATION FROM IFBRAMP BAYInner pontonNew structural design; ramp end is contiguous; no folding rampplatesOuter 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/stabilizerLifting lug, front andBoth fixedrearBilge outlets1. Redesigned outlets for draining folded bay2. Redesigned outlets for pumping out unfolded bayRailingNew designStowage box and lidIntegrated in outer ponton; lid even with top of deckIRB ASSEMBLYTable 1. Differences Between IRB and IFB.
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