TM 1-1510-224-10 NOTE Several  channels  can  be  deleted  at once by scratchpadding several channel numbers with a space between  them.    Scratchpadding  1  4 and depressing R2 will cause data in channels    1    and    4    to    be    deleted. Scratchpadding   1-4   and   depressing R2   will   cause   data   in   channels   1 through 4 to be deleted. 3-13.    EMERGENCY  LOCATOR  TRANSMITTER  (ELT 110-4). a. Description  An  automatic  or  manually  activated emergency  locator  transmitter  (ELT,  fig.    3-6),  is  located in   the   left   side   of   the   aft   fuselage.      The   associated antenna   is   mounted   on   top   of   the   aft   fuselage.      An access  hole  with  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.    The  transmitter contains   a   G   switch   which   automatically   activates   the transmitter   following   a   velocity   change   of   3.5   feet   per second.      When   activated,   the   ELT   will   radiate   Omni- directional  radio  frequency  signals  on  the  international distress   frequencies   of   121.5   and   243.0   MHz.      The radiated  signal  is  modulated  with  an  audio  swept  tone. Internal   batteries   provide   transmitter   operation   for   a minimum of 50 hours at -200C. b. Remote   Switch   and   Functions.      The   remote switch  is  accessible  through  a  small  (finger-size)  spring loaded  door,  located  on  the  left  side  of  the  aft  fuselage. The remote switch is placarded ON ARMED/RESET. (1) ON. Initiates emergency signal transmissions for test or for emergency purposes. (2) ARMED/RESET.  Used to   ARM the   ELT or reset it after an accidental activation. c. Normal Operation. During normal operation the remote switch is in the down (ARMED/RESET) position. d. Emergency  Operation.    The  ELT  may  be manually  activated  by  moving  the  remote  switch  to  the up (ON) position. 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  one  second,  then  immediately  rocking  it  down to    the    ARMED/RESET    position,    then    releasing    the switch. Section III.  NAVIGATION 3-14. NAVIGATION EQUIPMENT GROUP DESCRIPTION. The  navigation  equipment  group  provides  the  pilot  and copilot   with   instrumentation   required   to   establish   and maintain  an  accurate  flight  course  and  position,  and  to make   an   approach   on   instruments   under   Instrument Meteorological     Conditions     (IMC).          The     navigation configuration includes equipment for determining attitude, position, destination range and bearing, heading reference, and grounds peed. 3-15.        DIGITAL    INTEGRATED    FLIGHT    CONTROL SYSTEM (SPZ-4500). The  digital  integrated  flight  control  system  (fig. 3-7),   provides   flight   director   guidance,   autopilot,   yaw damper, and trim functions. The  digital  integrated  flight  control  system  is  an integrated   fail   passive   autopilot/flight   director/air   data system  which  has  a  full  complement  of  horizontal  and vertical flight guidance modes: Radio guidance modes Inertial navigation system tracking Air data oriented vertical modes The   pilot   can   couple   either   the   left    or    right electronic  flight  instrument  system  (EFIS)  to  the  single automatic  flight  control  system  for  control  of  the  aircraft. The flight control computer provides digital processing of heading,  navigation,  and  air  data  information  to  satisfy the  pilot's  requirements.    The  data  is  presented  to  the pilots  on  the  altitude  indicator  and  the  electronic  flight instrument system (EFIS). The    flight    control    system    displays    heading, course,  radio  bearing,  pitch  and  roll  attitude,  barometric altitude,  selected  alert  altitude,  radio  altitude,  short  and long    range    navigation,    course    deviation,    glideslope deviation,    to-from    indication,    TACAN        distance    and course indications, and VOR- DME distance information. Display  of  weather  radar  and  lightning  sensor  system information on the electronic horizontal situation indicators (EHSI) is also provided. Lighted     annunciators     denote     selected     flight mode,   altitude   alert,   decision   height,   and   go-around mode   (on   EADI's   only)   engagement.      Pitch   and   roll steering    commands    are    displayed    on    the    electronic attitude director indicators (EADI). 3-20