TM 55-1510-220-10 Control  of  the  lights  is  provided  by  a  switch  placarded ICE    ON    the    overhead    control    panel    (fig.        2-12). Prolonged  use  during  ground  operation  may  generate enough heat to damage the lens. f. Recognition    Lights.        A        switch    placarded RECOG   ON,   located   in   the   pilot's   subpanel   LIGHTS section (fig.  2-6), controls the white recognition light in each wing tip.  When requested, this steady, bright light is   used   for   identification   in   the   traffic   pattern.      The recognition lights circuit is protected by a 7 1/2 ampere RECOG  circuit  breaker  located  on  the  overhead  circuit breaker panel (fig.  2-27). 2-76.  INTERIOR LIGHTING. Lighting systems are installed for use by the pilot, copilot,  and  mission  operators  in  the  cabin  area.    The lighting    systems    in    the    cockpit    are    provided    with intensity   controls   on   the   overhead   control   panel.      A switch placarded MASTER PANEL LIGHTS ON, on the overhead control panel (fig.  2-12), provides overall on- off   control   for   all   engine   instrument   lights,   pilot   and copilot instrument lights, overhead panel lights, console and subpanel lights and the free air temperature light. a. Cockpit Lighting. (1) Flight  instrument  lights.    Each  individual flight instrument contains internal lamps for illumination. The circuit is protected by a 7 l/2-ampere circuit breaker placarded  FLT  INST  on  the  overhead  circuit  breaker panel  (fig.    2-27).    Control  is  provided  ,by  two  rheostat switches placarded PILOT INST LIGHTS OFF BRT and COP'II,OT  INST  LIGHTS  OFF  BRT  on  the  overhead control panel (fig.  2-12).  Turning the control clockwise from    OFF    turns    the    lights    on    and    increases    their brilliance. (2) Instrument indirect lights.  Three lights are mounted in the glareshield overhang along the top edge of  the  instrument  panel  and  provide  overall  instrument panel   illumination.      The   circuit   is   protected   by   a   5- ampere  circuit  breaker  placarded  INST  INDIRECT  on the overhead circuit breaker panel (fig.  2-27).  Control is    provided    by    a    rheostat    switch    placarded    INST INDIRECT  LIGHTS  OFF  BRT  on  the  overhead  control panel  (fig.    2-12).    Turning  the  control  clockwise  from OFF turns the lights on and increases their brilliance. (3) Engine instrument lights.  Each individual engine instrument contains internal lamps for  illumination.    The  circuit  is  protected  by  a  7  1/2- ampere   circuit   breaker   placarded   FLT   INST   on   the overhead  circuit  breaker  panel  (fig.    2-27).    Control  is provided by a rheostat switch placarded ENGINE INST LIGHTS  OFF  BRT  on  the  overhead  control  panel  (fig. 2-12).  Turning the control clockwise from OFF turns the lights on and increases their brilliance. (4) Flood light.  A single overhead flood light is installed.  It provides overall illumination of the entire cockpit  area.    The  circuit  is  protected  by  a  5-ampere circuit    breaker    mounted    beneath    the    battery    and connected  to  the  emergency  battery  bus.    Control  is provided  by  a  rheostat  switch  placarded  OVERHEAD FLOOD LIGHTOFF-BRT on the overhead control panel (fig.    212).    Turning  the  control  clockwise  from  OFF turns the light on and increases its brilliance. (5) Overhead   panel   lights.      Lamps   on   the overhead  circuit  breaker  panel,  control  panel,  and  fuel management  panel  are  protected  by  a  7  1/  2-ampere circuit breaker placarded OVHD on the overhead circuit breaker  panel  (fig.    2-27).    Control  is  provided  by  a rheostat switch placarded OVERHEAD PANEL LIGHTS OFF  BRT  on  the  overhead  control  panel  (fig.    2-12). Turning the control clockwise from off turns the lights on and increases their brilliance. (6) Subpanel  and  console  lights.    Lights  on the pilot's and copilot's subpanels, console edge lighted panels and pedestal extension panels are protected by a 7   1/2-ampere   circuit   breaker   placarded   SUBPNL   & CONSOLE  on  the  overhead  circuit  breaker  panel  (fig. 2-27).      Control   is   provided   by   two   rheostat   switches placarded SUBPANEL or CONSOLE LIGHTS OFF BRT on  the  overhead  control  panel  (fig.    2-12).    turning  the control   clockwise   from   OFF   turns   the   lights   on   and increases their brilliance. (7) Free air temperature light.  Two post lights are  mounted  adjacent  to  the  free  air  temperature  gage on  the  left  cockpit  sidewall  trim  panel.    The  circuit  is protected  by  a  7  1/2-ampere  circuit  breaker  placarded FLT INST on the overhead circuit breaker panel (fig.  2- 27).        Control    is    provided    by    a    pushbutton    switch adjacent to the gage.  No intensity control is provided. 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 2-70