TM  1-1520-240-10 2-13-2            a. Electroluminescent  Panel.  Three  panels  which form an equilateral triangle are aft of the forward pylon. Two panels are on top of the aft pylon aft of the anticolli- sion light. Power to operate and control the electrolumi- nescent formation lights is supplied by the LIGHTING FORM circuit breaker on the No. 1 PDP. b. NVG Formation Lights.  There is an NVG forma- tion light on each side of the forward pylon, two NVG formation lights on each side of the fuselage, two NVG formation lights on the aft pylon, one aft of the anticolli- sion light, and one on the vertical panel at the rear of the aft pylon. Power to operate and control the NVG forma- tion lights is supplied by the No. 1 DC bus through the LIGHTING NVG FORM circuit breaker on the No. 1 PDP. 2-13-4.  FORM Light Switches. The FORM (formation) light select and control switches are located on the EXT LTG panel on the left side of the overhead switch panel (fig. 2-1-10). a. FORM Light Select Switch.  A two-position toggle switch labeled NVG and NORM. In the NORM position, the five electroluminescent panels may be controlled by the  FORM  light  rotary  control  switch  for  normal  night formation operations. In the NVG position, the eight NVG formation  lights  may  be  controlled  by  the  FORM  light rotary control switch for the NVG night formation opera- tion. b. FORM  Light  Control  Switch.  A  rotary  control switch  labeled  OFF,  DIM,  and  BRT  with  three  evenly spaced incremental markings between DIM and BRT. It adjusts the intensity of the formation lights selected by the FORM light select switch. When the rotary control switch is OFF, the formation light system is deenergized. 2-13-5.  Anticollision Lights. Two red strobe anticollision lights are on the helicopter (3 and 7, fig. 2-13-1). One is on top of the aft pylon and the other is on the fuselage underside. Power to operate the anticollision  lights  is  supplied  by  the  No.  2  DC  bus through the LIGHTING ANTI COL TOP and BOT circuit breakers on the No. 2 PDP. 2-13-6.  ANTI COL Light Switches. Two ANTI COL TOP and BOT toggle switches are on the EXT LTG panel on the left side of the overhead switch panel (fig. 2-1-10). Each two-position switch is labeled OFF and ON. When the anticollision light switch is ON, the lights are energized. When the switch is placed to OFF, the anticollision lights are deenergized. Two controllable searchlights are mounted on the bottom of the fuselage (8, fig. 2-13-1). One is controlled from the pilot THRUST   CONT   lever   and   the   other   from   the   copilot THRUST CONT lever. One seachlight, either pilot or copilot is equipped with an infrared (IR) filter for NVG operations. Each  light  is  operated  independently  by  a  SRCHLT CONTR switch, SLT-FIL (searchlight filament), and posi- tion switch. They may be extended and stopped at any angle up to 90_ in a vertical plane and rotated 360_ about its vertical axis as long as the searchlight position switch is displaced. 2-13-7.  SRCHLT CONTR Switch. Two SRCHLT CONTR (searchlight control) switches are on  the  overhead  switch  panel  (fig.  2-13-2).  The  PLT SRCHLT CONTR switch is on the PLT LTG panel. The CPLT SRCHLT CONTR switch is on the CPLT LTG pan- el. each two-position switch is labeled RET and ON. When the SRCHLT CONTR switch is placed to ON, the STL-FIL switch on the THRUST CONTR lever becomes operational. If the searchlight is at any angle off center when the SRCHLT CONTR switch is placed to RET, the searchlight will automatically rotate to point forward and then will retract flush with the fuselage. Power is supplied by the No. 1 and No. 2 DC bus through the LIGHTING SLT CONT circuit breakers on the No.1 and No. 2 PDP. 2-13-8.  SLT-FIL Switch. CAUTION The IR searchlight emits invisible infrared rays which may be hazardous to person- nel  looking  directly  at  the  light  at  close range  or  touching  it.  Ensure  that  the  IR SLT-FIL switch is OFF and the light fully retracted when it is not in use. A SLT-FIL (searchlight filament) switch is located on the pilot and copilot THRUST CONT lever switch bracket (fig. 2-5-1.) Each switch is labeled ON and OFF. The switches turn on the landing-searchlight lamp, before or after extension. Pow- er to operate the landing searchlight lamp is supplied by the No. 1 and No. 2 DC bus through the LIGHTING SLT FIL circuit breakers on the No. 1 and No. 2 PDP. 2-13-9.  SEARCH LIGHT Position Switch. CAUTION Do not confuse the SEARCH LIGHT posi- tion switch with the two engines beep trim switches. A  five-position  momentary  SEARCH  LIGHT  switch  is  on each THRUST CONTR. lever switch bracket (fig. 2-5-1). It is labeled L (left), EXTEND, R (right), and RETRACT. The switch is spring-loaded to center off position. When the SRCHLT CONTR and SLT-FIL switches are ON, the searchlight can be controlled up and down or left and right  with  the  SEARCH  LIGHT  position  switch.  Power  to operate the searchlight position switch is supplied by the No. 1 and No. 2 DC bus through the LIGHTING SLT CONT circuit breaker on the No. 1 and No. 2 PDP.