TM 1-1510-218-10 3C-16 (3)  EFIS #1 and EFIS #2 Power Switch.  The EFIS  #1  /  EFIS  #2  power  switch  is  a  push-button switch located on the lower left side of the dash panel beneath the Turn and Slip Indicator.  Power is applied to the pilot’s display via  EFIS #1 switch and  power is applied to the copilot’s display via EFIS #2 switch. (4)  DME  HOLD  Switch.    The  DME  HOLD switch    enables    the    DME    hold    feature    of    VHF Omnidirectional   Radio   (VOR)   1.      The   DME   HOLD switch is located on the audio control panel   T2  and right of the FIRE PULL handles on the T1.  The pilot’s MFD monitors the DME HOLD switch and annunciates its position. (5)  COMPASS 1 and COMPASS 2 Switches.  The COMPASS 1 switch is located on the lower left side of the  dash  panel  under the  EFIS #1 / EFIS  #2  switch.    The  COMPASS  2  switch  is  located on  the  lower  right  side  of  the  dash  panel  under  the Vertical   Speed   Indicator.      The   compass   switches consist   of   a   gyro   FREE   /   SLAVE   switch   and   an INCREASE  /  DECREASE  (slew)  switch.    Selecting FREE  on  the  FREE  /  SLAVE  switch  disengages  the gyro and allows manual slewing of the compass card via the INCREASE / DECREASE switch.  When FREE is    selected,    heading    validity    is    ignored.        The COMPASS 1 switches control the pilot side compass card and the COMPASS 2 switches control the copilot side compass card.  The MFD does not interface with the  slew  switches  and  only  annunciates  the  state  of the FREE / SLAVE switch. (6)  Heading Switch.    The  Heading  Switch  is a three-position switch located on the lower left side of the   dash   panel   to   the   right   of   the   COMPASS   1 Switches.  This switch allows the selection of Heading data to be all systems on Compass 1, all systems on Compass  2,  or  Normal  (pilot  on  COMPASS  1  and copilot   on   COMPASS   2).      The   MFD   provides   an indication  when  both  sides  have  the  same  compass selected. c.  MFD   Display   Control   Panel.      The   MFD Control Panel provides integrated display management  via  the  controls  shown  in  Figure  3C-5. Unless otherwise noted the pilot’s control panel drives the   pilot’s   displays,   and   the   copilot’s   control   panel drives the copilot’s displays.  The pilot can select PFD on the display control panel  when  in the reversionary mode.    This  makes  the  top  display  a  PFD  without some of the functions. Whenever either display fails, it is probable that functions of that display will also fail. d.  Display    Control    Panel    Controls    and Functions.  Listed below are the controls found on the Control Panel and their corresponding functions. (1)  EHSI Brightness Control.  The brightness control  consists  of  two  concentric  knobs.    The  inner knob   controls   the   brightness   of   the   EHSI   (bottom MFD).  Full counterclockwise rotation of the brightness knob  provides  the  minimum  brightness  level  and  full clockwise   rotation   is   interpreted   as   the   maximum brightness setting. (2)  EADI Brightness Control.  The brightness control  consists  of  two  concentric  knobs.    The  outer knob  controls  the  brightness  of  the  EADI  (top  MFD). Full  counterclockwise  rotation  of  the  brightness  knob provides    the    minimum    brightness    level    and    full clockwise   rotation   is   interpreted   as   the   maximum brightness setting. (3)  CURSOR.          The     CURSOR     control operates  on  the  Map  and  Map  ARC  displays.    The CURSOR  joystick  moves  a  crosshair  symbol  in  XY motion.      The   bearing   and   distance   to   the   cursor symbol  is  displayed  next  to  the  aircraft  symbol.    The absolute bearing is in degrees.  Any time the cursor is active,  the  MFD  displays  its  absolute  bearing  (north referenced   azimuth)   and   range   in   degrees/nm   (for example – 273/22) next to the cursor.  A dashed  line connects  the  aircraft  symbol  and  the  cursor  symbol. After  30  seconds  of  no  cursor  movement,  the  cursor bearing and distance information is removed from the display  and  the  cursor  location  is  reset  to  a  bearing and  distance  of  zero.    The  MFD  will  reset  the  cursor back  to  the  aircraft  symbol  when  crosshair  time  out occurs, 30 seconds, when the CURSOR RST button is pressed,  or  when  a  different  page  is  selected.    The bearing and distance of the cursor location is sent out of  the  pilot’s  bottom  MFD  to  FMS  1.    To  activate  the MARK   function,   align   the   cursor   crosshairs   over   a desired  location  such  as  a  waypoint  and  press  the MARK button on the FMS-800 control. (4)  MFD  Test  Button.      Pressing   the   MFD Test button,  placarded  DU TEST,  places  both  onside MFD's into diagnostics mode when the current display page is not a diagnostic page and the aircraft is on the ground. The  diagnostics  page  consists  of  MFD  status information shown as a result of a  Built-In-Test (BIT). The  diagnostic  display  page  is  only  active  while  the aircraft  is  on  the  ground  and  the  Weight  On  Wheels (WOW) discrete is set. WARNING