TM 55-4920-328-13 mechanical linkage.  Pressure applied to the diaphragm causes  the  rotor  to  move  to  vary  the  induced  voltages across the transformer (stator) output leads.  Excitation voltage  for  the  unit  is  provided  by  system  26v  ac,  400 Hz power.  The input pressure range of the transmitter is 0  to  1,000  psig.    A  zero  adjustment  knob  is  located  on the  rear  face  of  the  transmitter  housing  to  provide  an electrical   zero   output   at   no   input   pressure.      The   ac analog   output   is   conditioned   and   displayed   as   gage pressures on the TORQUE/ PRESSURE digital indicator (4,   figure   1-22).      Selection   of   the   pressure   circuit function   to   be   displayed   is   made   by   depressing   the applicable    pushbutton    switch    on    the    data    selector assembly (7). 11.    TC/I  Transmitters    MT15    through  MT19. Five    identical    thermocouples    to    current    (TC/I)    low temperature transmitter (238, figure 724) are installed in the  data  acquisition  assembly  (Unit  11).    Since  these components  are  identical,  only  one  will  be  described. The   transmitter   is   a   solid   state   modular   measuring circuit used to sense input voltages (in millivolts) from a remote thermocouple.  The unit converts the input to an output  current  signal.    This  signal  is  transmitted  to  a panel-mounted vertical scale indicator to provide display of low temperatures sensed in the water brake assembly subsystem.    Input  power  for  the  transmitter  is  provided by  system  28v  dc  electrical  power.    The  current  drawn from  the  input  power  source  acts  as  the  output  signal. TC/I  transmitter  MT15  senses  inlet  water  temperatures to the water brake assembly used as a power absorption device during an engine test.  Output of the transmitter is  displayed  on  the  WATER  TEMPERATURE  IN  meter (2,  figure  1-25).    Transmitter  MT16  senses  outlet  water temperatures in the water brake assembly and displays the sensed temperatures on the WATER TEMPERATURE  OUT  meter  (3).    Transmitters  MT17, MT18, and MT19 sense temperatures of the water brake assembly  bearing  No.    1,  bearing  No.    2,  and  bearing No.  3, respectively.  These temperatures are displayed on the No.  1 BEARING TEMPERATURE meter (6); No. 2   BEARING   TEMPERATURE   meter   (7),   and   No.      3 BEARING TEMPERATURE meter (8), respectively. 12.    Pressure regulator. The pressure regulator (224, figure 7-24) is a relieving-type pneumatic regulator used in the T53 P1 air system. The    regulator    is    capable    of    regulation    of    inlet    air pressures up to 150 psig to outlet pressures from 0 to 20 inches H20. 13.    Air pressure gage.  The air pressure gage (228,    figure    7-24)    is    a    diaphragm-operated,    panel- mounted,   pneumatic   gage   used   in   the   T53   P1   air system during waveoff checks.  The instrument is used to display air pressures from 0 to 35 inches H20 in 1/2- inch increments. 14.    Solenoid valve.  The solenoid valve (232, figure 7-24) is an electrically-operated valve used in the T53 P1 air system.  Electrical power for operation of the valve  is  supplied  by  system  28v  dc  power,  through  the P1    AIR    switchlight    unit    (27,    figure    1-24)    on    the operator's panel assembly.  Supply air at approximately 125    psig,    downstream    from    the    right    hand    castle assembly (Unit 9), is routed through the solenoid valve and pressure regulator in the data acquisition assembly to the P1 AIR OUT quick-disconnect coupler (12, figure 1-29).  Connection to the coupler on the data acquisition assembly  may  be  made  to  connect  the  P1  bellows  on the T53 engine fuel control. e. Auxiliary  trailer  assembly.    The  auxiliary  trailer assembly  (figure  1-31)  consists  of  the  auxiliary  trailer module  (figure  1-32),  cooling  tower  module  (figure  1- 36), and diesel engine ac generator and cable set (figure 7-31).        The    auxiliary    trailer    assembly    provides    a continuous  supply  of  water  to  water  brake  assemblies, water   brake   bearings,   and   for   cooling   lubricating   oil. The   cooling   tower   module,   which   cools   the   returning water,  is  capable  of  dissipating  heat  energy  equivalent to  5,000  horsepower  on  a  standard  85 °F  wet  bulb  day. The  diesel  engine  ac  generator  and  cable  set  supplies all of the electrical power required for METS operation. Refer   to   paragraph   15   for   leading   particulars   of   the auxiliary trailer assembly. (1)    Auxiliary trailer module. The auxiliary trailer module (figure 1-32) consists of a frame and running gear assembly (1), water system (3), power distribution box (2), forward and aft leveling jacks (4,8), deck   plates   (7),   storage   boxes   (5,6),   and   associated piping,   cabling,   and   hardware.      The   forward   and   aft leveling    jacks    provide    leveling    adjustment    of    the auxiliary  trailer.    The  leveling  jacks  can  withstand  side loads resulting from uneven terrain or off-center loading. Each   forward   leveling   jack   is   trunnion-mounted   and swings    upward    to    attach    horizontally    beneath    the auxiliary trailer.  Each aft leveling jack has an adjustable clamp  bracket  that  may  be  adjusted  along  the  entire length of the jack tube toward the gear head.  The right and left deck plates (7) encompass the area around the water pumps and power 1-62