TM  1-1520-240-10 2-13-6            bulkhead. The six floodlights under the glareshield light the pilot, center, and copilot instrument panel. The two overhead floodlights light the overhead switch panel. Power to operate and control the floodlights is supplied by the DC essential bus through the LIGHTING INSTR FLOOD circuit breaker on the No. 2 PDP. 2-13-22.  FLOOD SWITCHES. The FLOOD switches are located on the INTR LTG panel at the right rear of the overhead switch panel (fig. 2-13-2). They consist of two floodlight selection switches and a rotary control switch. The floodlight selection switches are labeled INST and OVHD. Each switch has an OFF and ON position. The rotary control switch is labeled OFF, DIM, and BRT. a. INST and OVHD Floodlights Selection Switches.  Each switch is labeled for the area the floodlights will light. By placing either switch ON, the associated flood- lights will light when the rotary control switch is turned toward BRT. Placing the switch to OFF deenergizes the floodlight circuit. b. Floodlight Rotary Control Switch.  The rotary con- trol switch is used to adjust the floodlights from DIM to BRT once the respective floodlight selection switch is placed to ON. When the rotary control switch is OFF, the floodlights will be deenergized. 2-13-23.  Emergency Floodlights. If the pilot flight instrument lights have been turned on, loss of electrical power will cause the floodlights to automatically come on. All floodlights will function automatically in the BRT mode. Simultaneous dimming control of all floodlights can be regained by setting the FLOOD INST and OVHD selec- tion  switches  to  ON,  turning  the  floodlight  rotary  control switch to BRT on the INTR LTG panel, and turning the PLT INST rotary control switch to OFF. Floodlight intensity can be controlled by the floodlight rotary control switch on the INTR LTG panel. 2-13-24.  Cabin and Ramp Lights. Five cabin and ramp lights are in the cabin, attached to the overhead structure (fig, 2-13-4). Each light contains an NVG blue lamp and a white lamp which can be selected individu- ally. Power to operate and control the cabin and ramp lights is supplied by the switched battery bus through the LIGHT- ING CABIN & RAMP circuit breaker on the No. 1 PDP. 2-13-25.  CABIN AND RAMP LIGHTS Switches. WARNING If the white CABIN and RAMP LIGHTS are turned on during NVG operations, the ef- fectiveness of the NVG may be severely impaired and a hazardous situation may be  created  due  to  sudden  loss  of  pilot visual references. The CABIN and RAMP LIGHTS switches are located on a control panel below the ramp control lever. The control panel consists of a select switch and a CONTROL rotary switch. a. Select   Switch.  Three-position   toggle   switch   la- beled WHITE, OFF, and NVG. It is used to select the ap- propriate cabin and ramp lights. When placed to OFF, cabin and ramp lights are deenergized. b. CONTROL  Switch.    Rotary  switch  labeled  DIM and BRT. It adjusts the cabin and ramp White or NVG light level from DIM to BRT. 2-13-26.  Emergency Exit Lighting. Three emergency exit lights are in the cargo compartment close  to  each  of  the  three  primary  emergency  exits  (fig. 2-13-3). They are located by the main cabin door, the emer- gency  exit  opposite  the  main  cabin  door,  and  the  ramp emergency  exit.  The  lights  come  on  whenever  a  loss  of power on the switched battery bus occurs or during a land- ing when 3 to 4g’s are exceeded as sensed by an inertia switch. The emergency exit lights system is controlled by the EMER EXIT switch on the INTR LTG panel of the overhead switch panel. The lights may also be used as portable lamps by removing them from their housing and by rotating the han- dle, marked PULL EMERGENCY LIGHT, 45_ from its nor- mal position. Power to operate the emergency exit lights is supplied by two internal, 1.25 volt, nickel-cadmium batteries. Power to operate and control the charging, monitoring, and test circuit is supplied by the switched battery bus through the LIGHTING EMER EXIT circuit breaker on the No.1 PDP. 2-13-27.  EMER EXIT Switch. CAUTION If the EMER EXIT switch is left in ARM or DISARM with the helicopter shutdown and the  battery  connected,  the  charging  cir- cuit of the emergency exit light system will discharge the helicopter battery. Prior to turning the BATT switch OFF, place the EMERG EXIT switch to DISARM then set to TEST. The EMER EXIT switch is located on the INTR LTG panel of the overhead switch   panel   (fig.   2-13-2).   The   three-position   switch   is labeled  DISARM,  TEST,  and  ARM.  When  the  switch  is placed  to  ARM,  the  emergency  exit  lights  stay  off,  the batteries are charging, and the charge indicator lights come