control of the rounds and conveyor elements passing
through the transfer unit. The transfer unit removes the
rounds from the conveyor and places them into the
extractor lip of the gun breech bolts. The transfer unit
also receives expended cases and unfired rounds from
the gun breech bolts and places them in the conveyor
elements. When you install the transfer unit and the
adapter assembly as a single unit, press and hold the
timing pin on the transfer unit and the gun housing.
Once the transfer unit/adapter assembly is properly
attached, you must make sure that the spring-loaded
timing pins release.
The adapter assembly bolts directly to the transfer
unit. During downloading and loading operations, the
ammunition loading system (LALS).
REVIEW NUMBER 3
List the major parts of the drum unit
What component of the drum assembly looks
like the threads of a screw?
What is the purpose of the retainer gear and
steel ball bearings contained in the entrance
What component should you use to index the
drum for installation of the exit unit?
What is the purpose of the two sets of sprocket
spur gears located on the scoop disk?
What switch in the exit unit prevents expended
rounds from being fed into the gun and
assemblies in the entrance unit?
What part of the transfer unit and adapter
ammunition loading system (LALS)?
The chute assemblies are interlocking segments.
They provide a flexible path through which the
conveyor elements transport live rounds and expended
cases around an aircraft structure. The bypass chute
provides a path from the entrance unit to the exit unit,
through which the conveyor elements pass. The feed
chute provides a path from the exit unit to the adapter
assembly, through which the conveyor transports live
rounds or unexpended cases. The return chute provides
a path from the transfer unit to the entrance unit,
through which the conveyor transports expended cases
or unfired rounds.
The construction of the chute assemblies lets the
conveyor elements pass through in only one direction.
If the system is rotated in the wrong direction, the
element tabs will jam in the chute segments and
damage the system. The chute ends are color-coded red
and green to key the right connection to other
components. Additionally, each end is clearly marked
with a metal labeling plate. This identifies the
component to which a particular chute end must be
connected. The ends of the chutes are equipped with
The conveyor assembly consists of individual
conveyor elements shaped to cradle a 20-mm case. The
elements are joined together by removable hinge pins to
form an endless conveyor assembly. (See figure 6-13.)
Figure 6-13.Typical conveyor element assembly.