TM  55-1510-221-10 (2.) Instrument indirect fights. 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. 2-26).  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 l/2- ampere circuit  breaker  placarded  FLT  INST  on  the  overhead circuit breaker panel (fig. 2-26). 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. NOTE The floodlight is connected to the hot battery bus and will not be turned off by the battery switch; therefore, it must be turned OFF when the  aircraft  is  shutdown  to  prevent  discharging the  battery. (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 FLOODLIGHT-OFF-BRT on the overhead control panel (fig. 2-12). 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. 2-26). 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,  mission  control  panel,  and  pedestal  extension panels are protected by a 7 l/2-ampere circuit breaker placarded SUBPNL & CONSOLE on the overhead circuit breaker panel (fig. 2-26). 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.)  Outside  air  temperature  light.  Two  post lights  are  mounted  adjacent  to  the  outside  air temperature gage on the left cockpit sidewall trim panel. The  circuit  is  protected  by  a  71/2-ampere  circuit  breaker placarded  FLT  INST  on  the  overhead  circuit  breaker panel (fig. 2-26). 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 main spar cover. Both circuits are protected by a 5-ampere circuit breaker mounted  beneath  the  battery  and  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 switch on the right subpanel. Control is provided by the CABIN LIGHT switch on the right subpanel. (3.) Cabin spot lights. A spot light is mounted to each cabin aisle light. Each spot light is individually controlled  by  a  rheostat  placarded  OFF-ON-BRT  on  the back of the light. There is a momentary ON switch in the  center  of  the  rheostat.  Each  light  is  capable  of producing  a  red  or  white  spotlight  by  turning  the selector on the front of the light. To remove the light from the stationary position, pull down on the light. The light is connected to the light housing by an 11 inch coiled cord that extends to approximately 50 inches. (4.) Cabin door latching mechanism light.  A light  is  provided  to  check  the  cabin  door  latching mechanism. It is controlled by a red pushbutton switch located adjacent to the round observation window, which is just above the second step. 2-78.  EMERGENCY  LIGHTING. a.  Description.  An  independent  battery  operated lighting system is installed. The system is actuated automatically by shock, such as a forced landing. It provides  adequate  lighting  inside  and  outside  the fuselage to permit the crew to read instruction 2-69