TM 1-1510-225-10 3A-4 (18)   DME    2    Volume    Control.       A    DME    2 volume    control,    placarded    DME    2    VOL,    controls volume level of DME 2 audio. (19)   Annunciator Brightness Control.   A knob, placarded  ANN  DIM  /  PUSH  BRT, which controls the brightness  level  of  the  EFIS  annunciators,  located  on the  instrument  panel  above  the  airspeed  indicators, controls annunciator brightness. (20)   Stormscope   Control   Switch.      Lightning activity    weather    avoidance    information,    which    is displayed     on     the     Electronic     Horizontal     Situation Indicator's   (EHSI)   and   the   MFD,   is   controlled   by   a switch placarded STORMSCOPE CLEAR / ON / OFF.   The  CLEAR  position  will  remove  displayed  lightning strike   information.      When   the   switch   is   set   to   ON, lightning   strike   information   will   be   provided   to   the displays. (21)   Standby   Horizon   Power   Warning   Horn Silence  Switch.    The  standby  horizon  power  warning horn   may   be   silenced   by   pressing   a   push-button switch placarded  HORN SILENCE. (22)   Standby   Horizon   Power   Control   Switch.   A  switch,  placarded   ON  /  OFF  /  TEST,  controls  the standby horizon power system. (23)   Standby     Horizon     Power     Annunciator.   The    standby    horizon    power    system    annunciator, placarded  AUX ARM / AUX ON / AUX TEST, is used to monitor functional state of the system. (24)   Voice Advisory System (GPAAS) Switch- Indicator.  The upper half of the voice advisory system switch-indicator,   yellow,   is   placarded    VOICE    OFF.   The  lower  half  of  the  indicator,  red,  is  placarded   VA FAIL.      Pressing   the    VOICE    OFF    switch-indicator disables the GPAAS voice advisory and illuminates the VOICE OFF indicator light.  The  VA FAIL annunciator light illuminates when the GPAAS fails. (25)   Voice Advisory System (GPAAS) Volume Control.    A  GPAAS  volume  control  placarded   VOL, controls the audio volume of the GPAAS advisory/warning messages down to a certain minimum level. (26)   Transponder Selection Switch. A transponder selection switch, placarded XPNDR ATC / IFF,     allows     selection     of     either     the     commercial transponder, ATC, or military transponder, IFF. (27)   Air Data Computer Selection Switch.  An air   data   computer   selection   switch,   placarded    AIR DATA,  ALL  ON  1  /  NORM  /  ALL  ON  2,  allows  the operation  of:  both  EFIS  systems  on  the  number  1  air data  computer  (ALL  ON  1)  or  the  number  2  air  data computer (ALL ON 2).  It also allows the operation of one EFIS system  on  the  number  1  air  data  computer and  the  other  EFIS  system  on  the  number  2  EFIS system in the NORM position. 3A-7.  AM/FM (VHF/UHF) TRANSCEIVER (RT-5000). The   AM/FM   (VHF/UHF)   transceiver   (RT-5000) may be operated in the following frequency ranges:   a.   AM/FM Frequencies: 29.7 to 88 MHz   108 to 116 MHz (receive only) 118 to 156 MHz (AM band) 220 to 225 MHz 225 to 400 MHz   b.  FM Frequencies: 138 to 174 MHz 403 to 512 MHz   512 to 806 MHz   806 to 960 MHz   A   control-display   unit   (C-5000)   located   in   the pedestal extension, Figure 2-11, operates the transceiver.        The    system    is    powered    through    a 10-ampere  circuit  breaker  placarded   AM/FM, located on the right sidewall circuit breaker panel, Figure 2-6. The   transceiver   control-display   unit   can   store 350 channels  in  memory.    Frequencies  are  stored  by channel  number,  alphanumeric  identifier  assigned  by the user or by frequency.  Each channel has its own separate transmit and receive frequency, transmit and receive squelch control setting, channel identifier, and channel number. An  audio  recorder  provides  playback  of  the  last 10 seconds of the most recent reception. c.   AM/FM    (VHF/UHF)    Transceiver    Control- Display  Unit  Controls,  Indicators,  and  Functions.   Refer to Figure 3A-2. (1)   Upper  and  Lower  Soft  Keys.    The upper and  lower  soft  keys  are  display  controls.    Depending upon  the  display  page  in  use,  pressing  the  upper  or lower soft key will have the following results.