TM 1-1510-224-10 CHAPTER 4 MISSION EQUIPMENT Section I.  MISSION AVIONICS 4-1.  MISSION CONTROL PANEL. a. Description.    The  mission  control  panel  (fig.  4-1), mounted    on    the    copilot's    sidewall,    consists    of    three sections. The top section contains the mission caution/advisory    annunciator    panel.        The    annunciator panel   incorporates   all   mission   annunciators   along   with three  aircraft  system  annunciators   (CABIN  OVERTEMP, NO   INS   UPDATE,   and   INS   UPDATE).      The    center section   contains   a   digital   DC   volt/ammeter,   digital   AC volt/frequency  meters  (2),  and  AC  digital  load  meters  (2). The    bottom    section    contains    the    mission    equipment control    switches    and    the    mission    equipment    circuit breakers. b. Mission   Control   Panel   Controls,   Indicators,   and Functions. (1) Mission annunciator panel Mission annunciator panel functions are described in table 2-8. (2) Battery  voltmeter.    A  liquid  crystal  display indicator placarded   VDC,  which  indicates  aircraft  battery voltage. (3) Battery  ammeter.     A  liquid  crystal  display indicator placarded  AMPS, which indicates aircraft battery current. (4) AC    volt-frequency    meters.        Two    liquid crystal display meters, placarded  VAC FREQ indicate the voltage  and  frequency  output  of  the  #  1  and  #  2  three- phase   inverters   respectively.      The   meters   indicate   the voltage and -frequency of either the  A,  B,  or  C  phase  of the  inverters,  depending  on  the  position  of  the   METERS switch. (5) AC  loadmeters.    Two  liquid  crystal  display meters    placarded    AC%    LOAD,    indicate    the    load    in percent    on    the    #    I    and    #    2    three-phase    inverters respectively.    The  meters  indicate  the  load  on  either  the A,   B,   or  C   phase   of   the   inverters,   depending   on   the position of the METERS switch. (6) Rotating  boom  antenna  operating  position control   switch.      The   rotating   boom   antenna   operating position control switch, placarded  ANT ORIDE, OPR POS AUTO   ROTATE,   allows    overriding    antenna    operating position on the ground or automatic operation.  The antenna  normally  rotates  to  a  vertical  position  when  the landing  gear  is  retracted  and  automatically  rotates  to  a horizontal   position   when   the   landing   gear   is   extended. Moving the switch to the  OPR POS allows rotation of the antenna to the vertical position while on the ground. (7) Mission    equipment    control    switch.        The mission   equipment   control   switch,   placarded   MISSION CONTROL  ORIDE  -  AUTO  -  OFF  controls  power  to  the mission equipment. (a) ORIDE. The ORIDE (override) position is used to apply AC and DC power to the mission equipment when one generator has failed and the aircraft is not operating on external power. (b) AUTO. The AUTO (automatic) position    applies    AC    and    DC    power    to    the    mission equipment.      Power   is   automatically   removed   from   the mission  equipment  if  a  generator  fails,  and  the  aircraft  is not operating on external power. (c) OFF.      The    OFF    position    removes power from the mission equipment. (8) Radio altimeter switch.    The  radio  altimeter switch,    placarded    RADIO    ALT    ON,    OFF,     controls operation   of   the   radio   altimeter   system.      This   switch allows   turning   off   the   radio   altimeter   system   to   reduce radio emissions from the aircraft. (9) ELINT   power   switch.      The   ELINT   power switch, placarded  ELINT  ON  OFF,  controls  power  to  the ELINT mission equipment. (a) ON.      Applies   power   to   the    ELINT mission equipment. (b) OFF.        Removes    power    from    the ELINT mission equipment. (10) COMINT    power    switch.        The     COMINT power    switch,    placarded    COMINT    ON    OFF,    controls power   to   the   CHALS,   lowband,   and   remaining   mission equipment. (a) ON.    Applies  power  to  the  CHALS, lowband, and remaining mission equipment. (b) OFF.        Removes    power    from    the CHALS, lowband, and remaining mission equipment. 4-1