TM 5-5420-278-24&P
0003 00
0003 00-6
DIFFERENCES BETWEEN MODELS
There are no differences between models for individual units of the IRB interior or ramp bays. The IRB
is 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 IFB
The IRB has been designed to connect with IFB bays interchangeably, but there are many significant
differences in its appearance and operation. The following list is provided to assist maintenance personnel
in 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 IFB
RAMP BAY
Inner ponton
New structural design; ramp end is contiguous; no folding ramp
plates
Outer ponton
1. Redesigned; revised bow shape
2. Raised splash plate
3. Redesigned cleats
4. Reinforced deck
5. Redesigned load receiving recesses for redesigned rafting
brackets, air-transport, and load-retaining system.
6. No retaining cable fixing strut
7. No unfolding mechanism lever box
8. No ramp plate lifting device fixing points or poles
Upper coupling,
Locking recesses removable and made of steel
longitudinal
Upper coupling,
None
transverse
Travel latch
None
Foldlock
None
Outer ponton lock
New design; swivel hook actuated from deck
Unfolding mechanism
1. New design: torsion bar in outer ponton
2. Redesigned unfolding lever/stabilizer
Lifting lug, front and
Both fixed
rear
Bilge outlets
1. Redesigned outlets for draining folded bay
2. Redesigned outlets for pumping out unfolded bay
Railing
New design
Stowage box and lid
Integrated in outer ponton; lid even with top of deck
IRB ASSEMBLY
Table 1. Differences Between IRB and IFB.
