TM 55-4920-328-13 CB1 Air System CB2 Fuel System CB3 Oil System CB4 Beacon Light CB5 Instrument Power Supply CB6 Portable Oil Unit CB7 Spot Lights and Blowers CB8 Instrument Power CB9 Utility Outlet and Overhead Lights CB10 Heat Pump CB11 Motor Starter Control CB12 Oil Pre-Heat Subsystem CB13 Trickle Charger (d) Control cab module. 1.      The   control   cab   module   (1,   figure   1-21) contained in the control cab assembly consists essentially of an enclosure which houses METS controls and    instrumentation.        The    control    cab    module    is equipped externally with a 360-degree rotation, 200-watt flashing  red  beacon  light  (2)  which  operates  during  a test.  Two spot light assemblies (3) are mounted on the forward   wall   of   the   control   cab   module   to   provide illumination during a test, when required.  The interior of the     control     cab     module     contains     three     overhead fluorescent  light  fixtures,  electric  starter  motor  starting controls,     hydraulic     starter     motor     starting     controls, generator control and fault indicator panels, and a circuit breaker panel assembly (25), containing the main circuit breaker and 13 facility circuit breakers.  A heat pump (8) is  mounted  in  the  upper  left  aft  wall  of  the  control  cab module  for  environmental  control.    An  asbestos/rubber floor   matting   is   installed   on   the   floor   of   the   unit. Electrical  ducts  for  internal  wiring  and  cable  assembly protection are provided in the control cab module. Thirty     cable     assemblies     (exclusive     of     the     cable assemblies contained in the four consoles) are provided with the control cab module for electrical interconnection.    External  electrical  connections  to  the control  cab  module  are  made  at  the  control  cab  rear connector plate, the main power interface plate, and the test trailer bulkhead box assembly (11, figure 1-21).  A ground  rod  (9)  is  stowed  above  the  floor  of  the  cab along    the    bottom    of    the    four    instrumentation    sub- modules,    when    not    in    use    for    electrical    grounding protection   during   operation   of   the   system.      Fan-type blowers  are  provided  in  the  left  and  right  hand  castle assemblies  (Units  8  and  9)  (14,16)  to  provide  through circulation of air for instrumentation cooling.  A forward writing surface assembly (12), 16 inches deep, extends the  width  of  the  control  cab  module  above  the  lower sections   of   the   four   instrumentation   sub-modules.      A rear writing surface assembly (26) extends the width of the  control  cab  module  forward  of  the  aft  wall  of  the enclosure. 2.  Control cab.  The sound-attenuated control cab module (1, figure 1-21) is approximately 92 inches long and   96   inches   wide   with   an   internal   height   of   77.50 inches.      The   control   cab   module   is   equipped   with   a hinged  door  30  inches  wide  and  72  inches  high.    The door  opens  through  an  arc  of  110  degrees  to  a  detent, and  will  continue  opening  through  a  total  arc  of  165 degrees where the door may be latched in the full-open position.  A bullet-proof plate glass window, 2.00 inches thick,   15.50   inches   high,   and   41.50   inches   wide   is located in the forward wall of the control cab.  The wall containing  the  window  is  constructed  of  3/U-inch  steel for operator protection. 3.  Heat pump.  The heat pump (8, figure 1-21) is installed in the left rear wall of the control cab module. The   heat   pump   operates   in   the   same   manner   as   a conventional  room-type  cooling  and  heating  unit.    The heat   pump   has   high   and   low   speed   control   for   both cooling  and  heating,  separate  ventilation  and  exhaust systems,    and    an    automatic    thermostat    to    provide protection at temperatures below 32 °F.  The unit is also equipped   with   front   and   side   airflow   control   and   is mounted    on    a    slide-out    chassis    for    servicing    and removal  or  installation.    The  unit  operates  on  208v  ac, 60 Hz single-phase current from a receptacle on the rear wall of the control cab. (e)   Diagnostic   sub-module   (unit   1).      The diagnostic sub-module (figure 1-22) consists essentially of   a   modular   cabinet   assembly   which   contains   the instrumentation    used    to    monitor    engine    parameters during  a  test.    Digital  display  of  discrete  parameters  is made    on    the    panel    mounted    instrumentation    listed below.  The cabinet assembly provides mounting for 29 cable   assemblies   and   a   bottom   connector   mounting panel   assembly,   2   signal   distribution   terminal   board assemblies, a power distribution terminal board assembly,  4  lacing  bars,  and  2  lacing  bar  assemblies. Three   upper   and   lower,   left   and   right   rear   support brackets  are  installed  on  the  aft  frame  of  the  cabinet assembly  to  accommodate  the  chassis  track  slides  of removal   rack-mounted   components.      Instrumentation contained in the cabinet assembly, and shown in figure 1-22, includes the following: Temperature and Torque/Pressure Digital Indicator 1A1 (1,4) Data Selector Assembly 1A2 (7) Vertical Tape Indicator Assembly 1A3 (9) Thermocouple J unction  1 AD (11) Data Multiplexer 1A5 (14) 1-26