TM 1-1510-218-10 2-115 breaker,     placarded     LIGHTS     FLT     INST,     on     the overhead circuit breaker panel.   Control is provided by a   push-button   switch   adjacent   to   the   gauge.      No intensity control is provided. (12)   Free Air Temperature Light  T2  .   A press to   light   switch   located   adjacent   to   the   outside   air temperature indicator controls the indicator  ON / OFF power  function.    However,  light  intensity  is  controlled by the  COPILOT INSTR LIGHTS  rheostat.   The light circuitry  receives  power  through,  and  is  protected  by, the  LIGHTS  FLT  INST  circuit  breaker  located  in  the overhead circuit breaker panel. c.   Cabin Lighting. (1)   Interior  Lights  C  D  T1  .    Dual  intensity fluorescent  lights  are  installed  on  both  sides  of  the overhead trim.  The circuit is protected by a 10-ampere circuit breaker, placarded  FASTEN SEAT BELT / NO SMOKE    C   and  CABIN LIGHTS  & SIGN   D T1 , on the overhead circuit breaker panel.  Control is provided by a switch, placarded  INTR LIGHT OFF / DIM / BRT START,  on  the  overhead  control  panel.    The switch must   be   placed   in   the    BRT   START   position   to illuminate   the   lights.      Intensity  can  be  reduced  by placing the switch in DIM position. (2)   Interior  Lights   T2  .     Dual  intensity  cold cathode   lights   are   installed   on   both   sides   of   the overhead   trim.        The    circuits    are    protected    by    a 10-ampere circuit breaker, placarded CABIN LIGHTS, located on the overhead circuit breaker panel.   Control is provided by a switch, placarded  CABIN LIGHT ON BRIGHT, located on the overhead control panel.  Light intensity is increased by placing the switch in  BRIGHT position.    Cabin  light  intensity  is  also  increased  upon automatic deployment of the oxygen masks. (3)   No    Smoking    Fasten    Seat    Belt    Lights.   One  light  assembly  is  mounted  in  the  overhead  on each  side  of  the  cabin.    The  circuit  is  protected  by  a circuit breaker located on the overhead circuit breaker panel.      Control  is  provided  by  a  switch,  placarded CABIN SIGNS FASTEN SEAT BELT/ OFF /BOTH, on the   overhead   control   panel.      Placing  the  switch  in SEAT   BELT   position   will   illuminate   both   FASTEN SEAT   BELT   lights   and   sound   the   audible   warning chime  mounted  behind  the  upholstery  in  the  cabin.   Placing the switch in BOTH position will illuminate both FASTEN SEAT BELT and both  NO SMOKING lights and will sound the audible warning chime. (4)   Reading     Lights.          Reading    lights    are installed   in   the   upholstery   adjacent   to   each   seat position.      The   circuit   is   protected   by   a   10-ampere circuit breaker, placarded  FASTEN SEAT BELT / NO SMOKE   C and a 5-ampere circuit breaker, placarded READING LIGHTS  T , located on the overhead circuit breaker  panel.    Control  is  provided  by  a  push-button switch adjacent to each light. (5)   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. (6)   Dome Light.   A dome light is installed in the   baggage   area   in   the   overhead.      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 switch mounted adjacent to the light. 2-87.  EMERGENCY LIGHTING. a.   Description. An independent battery operated   lighting   system   is   installed.      The  system, which  consists  of  five lights, is actuated automatically by   shock   such   as   a   forced   landing.      It  provides adequate  lighting  inside  and  outside  the  fuselage  to permit    crew    and    passengers    to    read    instruction placards  and  locate  exits.    An  inertia  switch,  when subjected  to  a  2   –  3  G  shock,  will  illuminate  interior lights   in   the   cockpit,   forward   and   aft   cabin   areas, exterior lights aft of the emergency exit, and aft of the cabin door.   The battery power source is automatically recharged by the aircraft electrical system. b.  Operation.      An   emergency   lights   override switch   located   on   the   overhead   control   panel   is provided   to   turn   the   system   off   if   it   is   accidentally actuated.    The  switch  is  placarded   EMERG  LIGHTS OVRD  OFF  /  RESET    C  D  T1 and   EMER  LIGHTS OFF / RESET / AUTO /TEST   T2 .  Should the system accidentally     actuate,     placing     the     switch     in     the momentary   OFF/RESET   position   will   extinguish   the lights.   T2  To test the system, place the switch in the momentary    TEST    position    and    the    lights    should illuminate.    Moving  the  switch  to  the  OFF  /  RESET  position will turn the system off and reset it.