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. Adapter Assembly The adapter assembly bolts directly to the transfer unit.  During  downloading  and  loading  operations,  the adapter assembly interfaces with the linkless ammunition loading system (LALS). REVIEW NUMBER 3 Q1. List the major parts of the drum unit assembly. Q2. What component of the drum assembly looks like the threads of a screw? Q3. What is the purpose of the retainer gear and steel ball bearings contained in the entrance cover? Q4. What component should you use to index the drum for installation of the exit unit? Q5. What is the purpose of the two sets of sprocket spur gears located on the scoop disk? Q6. What switch in the exit unit prevents expended rounds   from   being   fed   into   the   gun   and jamming it? Q7. What is the purpose of the sprocket assemblies in the entrance unit? Q8. What  part  of  the  transfer  unit  and  adapter assembly interfaces with the linkless ammunition loading system (LALS)? CHUTE ASSEMBLIES 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 quick-release latches for ease of removal and installation. CONVEYOR ASSEMBLY 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.) 6-13 Figure 6-13.—Typical conveyor element assembly.