TM 5-5420-278-10
0003 00
0003 00-11
DIFFERENCES BETWEEN MODELS
There are two models that make up the IRB, the Ramp Bay M16 and the Interior
Bay M17. For differences between the M16 and M17, refer to WP 0003 00. There
are no differences between individual units of the same model 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. Table 1, below, is
provided to assist the operator in identifying IRB design features that differ from
the IFB. Refer to WP 0006 00 for operation of IRB. Refer to TM 5-5420-209-12 for
operation of IFB.
IRB ASSEMBLY
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
Table 1. Differences Between IRB and IFB.
