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TM 10-6640-233-10 Section III.  TECHNICAL PRINCIPLES OF OPERATION 1-18. Functional Description of AOAP Mobile Laboratory Support Systems.   The  following  paragraphs  describe the systems designed to support the AOAP Mobile laboratory.  For details of major equipment, refer to the appropriate equipment manual. a.    The semitrailer is divided into three individual compartments.  Each compartment is separated from the next by insulated metal bulkhead.  The bulkheads separate the receiving compartment from the main laboratory, and the main laboratory from the mechanical room.  The forward bulkhead has a latched and lockable door capable of being latched during transit.  The aft bulkhead helps control the ambient temperature within the main laboratory by providing a separate compartment for the receipt of samples and personnel entry and exit.  Undercarriage compartments provided for stowage of miscellaneous gear and overpack items (i.e., power reel, hosing, two 12-volt batteries, access ladders, etc.).  These compartments  are  separable  to  facilitate  air  transport  (C  141  &  C5A/B)  of  the  AOAP  Mobile  laboratory.    The  AOAP Mobile laboratory floor is of laminar design.  It consists of formed aluminum sheets, polyurethane foam formed in place, and a marine plywood subfloor with linoleum over it.  Structural members that are on 16-inch centers and run the length of  the  trailer  provide  load  support  adequate  for  equipment  and  personnel.    The  interior  ceiling  of  the  AOAP  Mobile laboratory contains the environmental air plenum and the fluorescent light fixtures.  The light fixtures are contained within hinged  panels  which  are  adjacent  to  the  centrally  located  air  duct.    The  hinged  panels  run  the  entire  length  of  the laboratory  ceiling  and  provide  access  to  both  the  light  fixtures  and  the  corresponding  portion  of  the  power  distribution system.  The main and aft compartments have solid epoxy countertops, with steel cabinetry below.  They are located on the roadside and curbside wall areas which are not occupied by major floor-mounted equipment.  The countertops serve as  mounting  surfaces  for  smaller  major  items.    Support  apparatus  and  devices  are  located  within  the  cabinets.    The cabinetry does not block or interface with the aisle or means of exit from any compartment. b.    Environmental Control System.   The four Environmental Control Units (ECUs) are identical units, each with its own controller.  They operate on 208V, 60Hz, 3-phase power and are rated at 18,000 BTUs per hour when cooling and 12,000  BTUs  per  hour  when  heating.    They  are  in  fact  heat  pumps  and  provide  both  cooling  and  heating  for  the laboratory.  During the purge cycle, their blowers are utilized to over pressurize the laboratory and expel any explosive gases.    They  are  installed  on  the  front  wall,  exterior  of  the  semitrailer.    The  units  do  not  transfer  vibration  to  the semitrailer nor are air leaks present at the intake or supply interface.  The units are grounded and piping is provided to remove  the  condensate  from  the  air  conditioning  units  to  an  outboard  position  on  the  roadside  of  the  trailer.    The environmental controls are located in one panel/switchbox positioned in the main laboratory compartment, on the forward roadside wall adjacent to the fume hood.  The air conditioning portion of the control consists of two rotary switches and one external thermostat.  ECU controls No.1, 2 and 3 activate the three environmental control units supplying air to the general  environment  duct.    ECU  control  No.1,  paired  with  an  internal  thermostat  located  within  the  computer  cabinet, activates and controls the environmental control unit supplying air to the equipment plenum.  The heating controls consist of  two  rotary  switches,  one  for  the  equipment  plenum  and  one  for  the  general  environment  duct,  neither  of  which functions  without  the  corresponding  air  circulating  fans  located  within  the  environmental  control  units  in  operation. Indicator lights are incorporated in the environmental control panel as an indication of operational feedback.  Green is used as an indication of normal computer operation. 1-15


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