TM 55-1510-222-10 (a) External AC power Annunciator. The  annunciator  placarded  EXT  AC  PWR  ON,  located in the mission annunciator panel (fig. 4-1), indicates that external AC power is connected to the 3 phase busses. The  EXTERNAL  POWER  annunciator  in  the  advisory annunciator   panel   indicates   that   an   AC   GPU   plug   is mated to the AC external power receptacle. (b) External AC power control switch.    The  switch  placarded  EXT  PWR  RESET  ON OFF,   located   in   the   mission   control   panel   (fig.   4-1), controls   application   of   three   phase   AC   power   to   the aircraft. Section X.  LIGHTING 2-75. EXTERIOR LIGHTING . a. Description.  Exterior lighting (fig. 2-30) consists of:  a navigation light on the aft end of the aft portion of the vertical stabilizer; one standard navigation light  on  the  outside  of  each  wing  tip  pod;  two  strobe beacons, one on top of the horizontal stabilizer (directly above  the  vertical  stabilizer)  and  one  on  the  underside of  the  fuselage  section;  dual  landing  lights  and  a  taxi light mounted on the nose gear assembly; a recognition light located in the outboard leading edge of each wing; two  ice  lights,  one  light  flush  mounted  in  each  nacelle positioned to illuminate along the leading edge of each outboard   wing;   and   emergency   exit   lights   aft   of   the escape hatch and aft of the cabin door. b. Navigation Lights.  The navigation lights are protected by the 5-ampere circuit breaker placarded NAV  on  the  overhead  circuit  breaker  panel  (fig.  2-6). Control of the lights is provided by the switch placarded NAV  ON,  located  in  the  overhead  control  panel  (fig.  2- 13). c. Strobe  Beacons.    The  strobe  beacons are  dual  intensity  units.    They  are  protected  by  the  15- ampere circuit breaker placarded BCN on the overhead circuit  breaker  panel  (fig.  2-6).    Control  of  the  lights  is provided  by  the  switch  located  in  the  overhead  control panel    placarded    BEACON    DAY    NIGHT    (fig.    2-13). Placing  the  switch  in  the  DAY  position  will  activate  the high   intensity   white   section   of   the   strobe   lights   for greater  visibility  during  daylight  operation.    Placing  the switch    in    the    NIGHT    position    activates    the    lower intensity red portion of the strobe lights. d. Recognition    Lights.        The    recognition lights, which are normally used in the traffic pattern, are operated by the two-position switch placarded RECOG, located in the pilot's subpanel.  The lights provide a very bright,  steady  illumination.    They  are  protected  by  a  7. 5-ampere circuit breaker, located in the overhead circuit breaker panel. e. Landing/Taxi Lights.  Dual landing lights and  a  single  taxi  light  are  mounted  on  the  nose  gear assembly.      The   lights   are   controlled   by   the   switches placarded   LANDING   and   TAXI,   located   in   the   pilot's subpanel.    The  landing  light  circuit  its  protected  by  the 5-ampere  circuit  breaker  placarded  LANDING,  located in the overhead circuit breaker panel (fig. 2-6).  The taxi light  circuit  is  protected  by  a  5-ampere  circuit  breaker placarded TAXI, located in the overhead circuit breaker panel  (fig.  2-6).    Landing/Taxi  lights  are  automatically turned   off   when   the   landing   gear   is   retracted.      The landing lights and taxi light power circuits are protected by 35-ampere and 15-ampere circuit breakers, respectively, located in the DC power distribution panel, beneath the aisleway forward of the wing main spar. f. Ice   Lights.      The   ice   lights   circuit   is protected by the 5-ampere circuit breaker placarded ICE on the overhead circuit breaker panel (fig. 2-6).  Control of the lights is provided by the switch placarded ICE ON on the overhead control panel (fig. 2-13). 2-76.  INTERIOR LIGHTING. Lighting   systems   are   installed   for   use   by   the pilot  and  copilot.    The  lighting  systems  in  the  cockpit, are   provided   with   intensity   controls   on   the   overhead control   panel.      The   switch   placarded   MASTER   ON, located  in  the  overhead  control  panel  in  the  COCKPIT LIGHTING  section  (fig.  2-13),  provides  overall  control for    all    engine    instrument    lights,    pilot    and    copilot instrument  lights,  overhead  panel  lights,  and  subpanel lights.  The switch placarded IR FLOOD ON, located on the overhead control panel adjacent to the MASTER ON switch (fig. 2-13), provides overall control for instrument panel, glareshield, and pedestal extension/cockpit lights. a. Cockpit Lighting. (1) Utility  lights.    Two  utility  lights are located in the cockpit overhead to provide additional instrument panel IR lighting, as required.  The lights are 2-72