TM 55-1510-222-10 protected by the 7.  5-ampere FLT INST circuit breaker, located  in  the  overhead  circuit  breaker  panel  (fig.  2-6). Variable   light   intensity,   for   both   lights,   is   provided through  the  INSTRUMENT  PANEL  rheostat,  located  in the IR FLOOD LIGHTS switch section, on the overhead control panel.  Individual intensity control is provided by a switch placarded BRT DIM OFF, located in each utility light. (2) Glareshield   lights.      Lights   are mounted in the glareshield overhang along the top edge of   the   instrument   panel,   providing   overall   instrument panel IR illumination.  The circuit is protected by the 5- ampere  circuit  breaker  placarded  INST  INDIRECT  on the overhead circuit breaker panel (fig. 2-6).  Control is provided by the rheostat switch placarded GLARESHIELD  on  the  overhead  control  panel,  located in   the   IR   FLOOD   LIGHTS   switch   section   (fig.   2-13). Turning the control clockwise from OFF, illuminates the lights and increases their brilliance. (3) Flood  light.    A  single  overhead cockpit flood light is installed.  This light provides overall IR illumination of the entire cockpit area.  The circuit is protected  by  the  7.5-ampere  circuit  breaker  placarded FLT    INST,    located    in    the    overhead    control    panel. Control   is   provided   by   the   rheostat/switch,   placarded PED EXT/COCKPIT, located in the IR FLOOD LIGHTS switch section of the overhead control panel (fig. 2-13). Turning the control clockwise from OFF, illuminates the light and increases its brilliance. (4) Flight   instrument   lights.      Each individual  flight  instrument  contains  internal  lamps  for illumination.  The circuit is protected by the 7.5-ampere circuit  breaker  placarded  FLT  INST  on  the  overhead circuit  breaker  panel  (fig.  2-6).    Control  is  provided  by the two rheostat switches placarded PILOT INSTRUMENTS and COPILOT INSTRUMENTS, located    in    the    overhead    control    panel    (fig.    2-13). Turning the control clockwise from OFF, illuminates the lights and increases their brilliance. (5) Engine  instrument  lights.    Each individual engine instrument contains internal lamps for illumination.  The circuit is protected by the 7.5-ampere circuit   breaker   placarded   FLT   INST   in   the   overhead circuit  breaker  panel  (fig.  2-6).    Control  is  provided  by the rheostat switch placarded ENGINE INSTRUMENTS on  the  overhead  control  panel  (fig.  2-13).    Turning  the control  clockwise  from  OFF,  illuminates  the  lights  and increases their brilliance. (6) Overhead  panel  lights.    Lamps illuminating  the  overhead  circuit  breaker,  control,  and fuel   management   panels   are   protected   by   the   7.5- ampere     circuit     breaker,     placarded     OVHD     in     the overhead   circuit   breaker   panel   (fig.   2-6).      Control   is provided  by  the  rheostat  switch  placarded  OVERHEAD PANEL located in the overhead control panel (fig. 2-13). Turning the control clockwise from OFF, illuminates the lights and increases their brilliance. (7) Subpanel    and    console    lights. Lights  on  the  pilot's  and  copilot's;  subpanels,  console edge lighted panels, mission control panel, and pedestal extension panels are protected by the 7.5-ampere circuit breaker,    placarded    SUBPNL    &    CONSOLE    on    the overhead   circuit   breaker   panel   (fig.   2-6).      Control   is provided    by    the    two    rheostat    switches    placarded SUBPANEL or CONSOLE in the overhead control panel (fig.  2-13).    Turning  the  control(s)  clockwise  from  OFF, illuminates the lights and increases their brilliance. (8) Outside   air   temperature   light. Two post lights are mounted adjacent to the outside air temperature   gage   on   the   left   cockpit   sidewall.      The circuit   is   protected   by   the   7.5-ampere   circuit   breaker placarded  FLT  INST  on  the  overhead  circuit  breaker panel  (fig.  2-6).    Control  is  provided  by  a  pushbutton switch   adjacent   to   the   gage.      Light   intensity   is   not adjustable. b. Cabin Lighting. (1) Threshold and spar cover lights. A threshold light is installed just above floor level on the left side of the cabin, just inside the cabin door.  A spar cover light is installed on the left side of the sunken aisle immediately  aft  of  the  main  spar  cover.    Both  circuits are  protected  by  a  5-ampere  circuit  breaker  located  in the  battery  box,  and  are  connected  to  the  emergency battery  bus.    Both  lights  are  controlled  by  the  switch mounted adjacent to the threshold light.  If the lights are illuminated,   closing   the   cabin   door   will   automatically extinguish them. (2) Cabin  aisle  lights.    Three  cabin aisle  lights  are  installed  in  the  cabin  aisle.    Control  is provided   by   the   CABIN   LIGHTS   BRIGHT   DIM   OFF switch located in the pilot's subpanel. (3) Cabin utility lights.  A utility light is  located  adjacent  to  each  overhead  flood  light  in  the cabin  area.    The  utility  lights  are  individually  controlled by  the  rheostat/switch  placarded  OFF  ON  BRT  located on the back of each light.  A momentary 2-74