TM 55-1510-222-10 METHOD Multiply  3,226  L  X  0.84  =    2.709.8  L,  multiply  2 crew X 7.2 LPM = 14.4 LPM, multiply 1 passenger X   3.7   LPM,   add   14.4   LPM   crew   plus   3.7   LPM passenger  =  18.1  LPM.    Divide  3,226  L  by  18.1 LPM = 178.2 minutes. g. Oxygen   Cylinder   Capacity   Example   Problem. Oxygen  cylinder  capacity  is  determined  by  using  figure 2-23. WANTED Percent     of     capacity     at     known     pressure     and temperature. Pressure when temperature decreases. KNOWN Pressure = 1,600 PSIG stabilized cylinder temperature    is    estimated    at    20° C    decreased stabilized cylinder temperature is estimated at -30° C. METHOD Enter 1600 PSIG move up to 20°  C line, move right to 84%. Move left on 84% line to -30°  C line, move down to 1250 PSIG. WANTED 100% capacity pressure at known temperature. KNOWN Temperature =  -30°  C. METHOD Move left along 100% line to -30°  C line and move down to 1420 PSIG. 2-62. WINDSHIELD WIPERS. a.   Description. Two electrically operated windshield   wipers,   are   provided   for   use   at   all   flight speeds.        The    rotary    switch    (fig.    2-13)    placarded WINDSHIELD  WIPER,  located  in  the  overhead  control panel,  selects  mode  of  windshield  wiper  operation.    An information  placard  above  the  switch  states:  DO  NOT OPERATE ON DRY GLASS.  Function positions of the switch, as read clockwise, are placarded: PARK - OFF - SLOW - FAST.  When the switch is held in the spring- loaded   PARK   setting,   the   blades   will   return   to   their normal   inoperative   position   on   the   glass,   then,   when released,    the    switch    will    return    to    OFF    position terminating windshield wiper operation.  The FAST and SLOW  switch  positions  are  separate  operating  speed settings for wiper operation.  The windshield wiper circuit is protected by one 10-ampere circuit breaker, placarded WSHLD WIPER, located in the overhead circuit breaker panel (fig. 2-6). CAUTION Do  not  operate  windshield  wipers  on dry  glass.    Such  action  can  damage the   linkage   as   well   as   scratch   the windshield glass. b.   Normal Operation.  To start, turn WINDSHIELD WIPER switch to FAST or SLOW speed, as desired.  To stop, turn the switch to the PARK position and release. The    blades    will    return    to    their    normal    inoperative position  and  stop.    Turning  the  switch  only  to  the  OFF position will stop the windshield wipers, without returning them to the normal inactive position. 2-63. FERRY CHAIR. For   ferry   purposes,   a   forward   facing   chair   may   be attached to the floor tracks at fuselage station 211.87. 2-64. CIGARETTE LIGHTERS AND ASH TRAYS. The  pilot  and  copilot  have  individual  cigarette  lighters and ash trays mounted in escutcheons out-board of their seats.      The   cigarette   lighters   are   protected   by   a   5- ampere circuit breaker, placarded CIGAR LIGHTER, on the overhead circuit breaker panel (fig. 2-6). 2-65. CHEMICAL TOILET. a.   Description.      A   side-facing,   chemical   toilet   is installed  in  the  aft  cabin  area  and  can  also  be  used  as an  additional  seat.    Two,  hinged  lid  half-sections  must be  raised  to  gain  access  to  the  toilet.    Waste  is  stored within  a  removable  container  located  below  the  seat  in the cabinet assembly.  This non-flushing system uses a dry chemical preparation to deodorize the stored waste. A   toilet   tissue   dispenser   is   contained   in   a   slide-out compartment on the forward side of the toilet cabinet.  A box  of  disposable  waste  container  liners  and  a  box  of chemical deodorant 2-55