TM 1-1510-225-10 3A-14 a.   Give billing information. b.   Give   telephone   number   that you are calling or: c.   Place telephone in queue (camp  on)  and  wait  for  direct dial station. (c)   Voice  Conversation.     No  direct  dial station  is  available.    The  strongest  operator  assisted station has been selected and its channel is in use. 1.   Handset  –  Hang  up  and  try  later or: 2.   Place  telephone  in  queue  (camp on) and wait for direct dial station. 3A-11.  EMERGENCY LOCATOR TRANSMITTER   (ELT 110-4). NOTE On aircraft serial numbers 92-3327, 92-3328,  and  92-3329, an access hole with a   spring-loaded   cover   is   located   in   the fuselage  skin  adjacent  to  the  transmitter, enabling    a    downed    pilot    to    manually initiate or terminate operation, or reset the ELT to an armed mode. a.   Description.        An    automatic    or    manually activated ELT, Figure 3A -5, is located in the left side of the  aft  fuselage.    The  associated  antenna  is  mounted on top of the aft fuselage.  The transmitter contains a G  switch  that  automatically  activates  the  transmitter following   a   velocity  change  of  3.5  feet  per  second.   When  activated,  the  ELT  will  radiate  omnidirectional radio  frequency  signals  on  the  international  distress frequencies   of   121.5   and   243.0   megahertz.      The radiated signal is modulated with an audio swept tone.   Internal  batteries  provide  transmitter  operation  for  a minimum of 50 hours at –20 ºC. b.  Remote  Switch  and  Indicator  Light.    The remote switch and indicator light are located on the left sidewall   next   to   the   free   air   temperature   indicator, Figure   2-7.      The   ELT   annunciator,   placarded   XMT, illuminates to indicate that the ELT is transmitting.  The remote switch is placarded ON / ARM. (1)   ON – Initiates emergency signal transmissions for test or for emergency purposes. (2)   ARM   –  Used  to  arm  the  ELT  or  reset  it after an accidental activation. c.   Normal Operation.  During normal operation the remote switch is in the ARM position. d.  Emergency  Operation.    Moving  the  remote switch  to  the   ON  position  will  manually  activate  the ELT. e.   Resetting  the  ELT.    If  the  ELT  is  activated accidentally, it will need to be reset.  Do this by moving the remote switch up to the  ON position and holding it there for 1 second, then immediately rocking it down to the ARM position, then releasing the switch. 3A-12.  COCKPIT VOICE RECORDER SYSTEM. a.   Description.      The    cockpit   voice   recorder system is a solid-state system consisting of a cockpit voice  recorder  and  a  control  unit,  Figure  3A -6.    The cockpit  voice  recorder  system  provides  four  separate channels   for   voice   recording   which   originate   at   the pilot's audio amplifier,  the copilot's audio amplifier, the aural    annunciator    audio    amplifier,    and    the    area microphone     in     the     cockpit.          The     cockpit     area microphone  is  strategically  located  to  pick  up  cockpit voice    signals.        The    control    unit    (containing    the preamplifier,   TEST   switch,   and   ERASE   switch)   is located  in  the  pedestal  extension,  Figure  2-11.    The cockpit    voice    recorder    system    is    protected    by    a 5-ampere   circuit   breaker   placarded   VOICE   RCDR, located on the right sidewall circuit breaker, Figure 2-6. (1)   Cockpit   Voice   Recorder   –   The   cockpit voice  recorder  records  all  voice  signals  transmitted  or received  by  crew  members  for  a  maximum  period  of 30 minutes continuous operation.  After 30 minutes of continuous operation the voice recordings are erased.   The  cockpit  voice  recorder  is   housed  in  an  orange equipment    case    that    is    designed    to    protect    the recordings from damage resulting from an accident. b.  Cockpit Voice Recorder Controls, Indicators, and Functions.  (1)   Test  Meter.    The  test  meter  provides  an indication   of   the   relative   strength   of   voice   signals coming     from     the     cockpit     microphone     or     audio amplifiers. (2)   TEST    Switch.        A    push-button    switch placarded  TEST  provides a means of testing the area microphone channel.