entrance ends during operation. Except for size, the
transporter is similar to the aircraft drum assembly.
The transporter can be locked onto the MHU-191
transporter or stacked three high for storage purposes.
The transporter has an ammunition drum mounted in a
rigid-frame drum adapter assembly.
The drum adapter assembly is a box-type structure
that allows the transporters to be stacked. Four hinge
plates and four quick-release pins are used to lock the
transporter onto the MHU-191 transporter. Two lifting
lugs (on 30-inch centers) mate with a weapons carrier
so that an overhead crane can be used to lift the
transporter. Additionally, there are two forklift pockets
that allow the forklift truck to move the transporter.
There are four tie-down rings to secure the transporter
to the deck. Foldout steps, if needed, are located at the
exit end of the transporter to provide personnel with the
additional height to operate the LALS.
The ammunition drum is a cylindrical structure that
consists of an outer drum structure, an inner drum, two
scoop disk assemblies, and two cover assemblies.
OUTER DRUM. The outer drum is a storage
container for ammunition, and it provides a housing for
the inner drum. There is a rounds-remaining indicator
window so you can determine the number of rounds
remaining in the drum. The drum partitions, mounted
longitudinally within the outer drum to hold the rounds
in place, hold the rounds radially around the outer drum
with their bases in an outward direction.
INNER DRUM. The inner drum is a welded
assembly with a mounting ring at each end. There are
sheet metal leaves welded to the outer surface of the core
that form a double-lead helix. When the inner drum is
rotated, it moves the rounds along the drum partitions
from the entrance end to the exit end of the drum.
SCOOP DISK ASSEMBLIES. A scoop disk
assembly is mounted on each end of the inner drum.
There are three rails on the scoop disk assemblies,
forming a continuation of the inner drum helix. Also,
two sets of gear-driven sprockets and scoop extensions
are located on the scoop disks 180 degrees apart. These
sprockets and scoop extensions transfer the rounds from
the entrance cover to the outer drum partitions and from
the outer drum partitions to the exit cover. The entrance
scoop disk has two pins that hold the scoop extensions
closed when they are activated by a cam in the outer
drum. This prevents feeding rounds into the empty
space where the drum partitions cannot control the
DRUM COVER ASSEMBLIES. A drum cover
assembly is mounted on each end of the outer drum. The
drum cover assemblies accept rounds from the entrance
unit, load units, or from the scoop disk assembly. It then
places the rounds into the scoop disk assembly (entrance
end) or exit unit, respectively. The retainer partitions on
the retainer gear maintain control of the rounds between
the scoop disk assemblies and the entrance or exit units.
A spring-loaded timing pin on each drum cover is used
to index the drum during installation of the entrance and