TM 1-1510-225-10 3B-188 Table 3B-107.  Aural Annunciator Messages  (Continued) MESSAGE INTERPRETATION Increase Descent; Increase Descent Follows "descend" advisory due to intruding aircraft's maneuvering.  Rate of descent of own aircraft should be increased. Climb-Climb Now; Climb, Climb Now Follows  "descend"  advisory  when  reversal  of  vertical speed   is   required   due   to   maneuvering   of   intruding aircraft. Descend, Descend Now; Descent, Descend Now Follows   "Climb"   advisory   when   reversal   of   vertical speed is required due to maneuvering of the intruding aircraft. Threat Situation Resolved Clear of Conflict Intruding aircraft is no longer a threat. f.    Traffic    Display.        Four   types   of   symbols differentiated  by  shape  and  color  are  used  to  display intruders   around   your   own   aircraft.      The   different symbols    represent    Other    traffic,    Proximate    traffic, Traffic   Advisories   (TA),   and   Resolution   Advisories (RA). (1)   Off-Scale  and  No-Bearing Traffic.  When an  intruder  is  outside  the  indicator  display  range,  the symbol associated with it will be a partial one shown at the outside edge of the display at the relative bearing to  the  target.    As  the  aircraft  moves  into  the  display range,   the   symbol   will   become   a   full   symbol   as   it moves  into  the  display  area.    When  the  TCAS  cannot compute  bearing  information  on  an  RA  or  TA  intruder, a  text  message  will  be  displayed.    For  example,  RA 1.4-10  IS  A  RESOLUTION  ADVISORY  DUE  TO  AN AIRCRAFT 1.4 MILES DISTANT, 1000 FEET BELOW YOUR  AIRCRAFT,  AND  CLIMBING.    The  text  for  a RA will be red and a TA will be yellow. (2)   Other   Traffic.      A   cyan   or   white   open diamond    indicates    an    Other    Traffic    intruder.        It represents an aircraft greater than 6 nm away, and/or greater   than   ±   1200   feet   altitude   relative   to   your aircraft.    Other  traffic  is  not  displayed  on  indicators operating  in  the  pop-up  mode  unless  a  TA  or  RA  is simultaneously present. (3)   Proximate   Traffic.      A   Proximate   Traffic intruder is displayed as a cyan or white solid diamond.   It  represents  an  aircraft  within  6  nm  and  ±1200  feet relative  altitude.    These  aircraft  are  not  considered  a threat,  but  are  displayed  to  assist  the  flight  crew  in visually  acquiring  the  intruders.    In  the  pop-up mode these intruders will not be displayed unless a TA or RA is simultaneously present. (4)   Traffic  Advisory  Traffic.    TA  aircraft  are displayed   as   a   yellow   solid   circle.      At   the   time   an intruder  is  upgraded  to  a  TA,  the  aural  alert,  "Traffic, Traffic"  is  annunciated.    A  TA  is  an  aircraft  that  is within the limits from Closest Point of Approach (CPA) shown  in  Table  3B -108.    This  gives  the  crew  time  to visually  acquire  the  intruding  aircraft.    No  maneuvers will   be   commanded   by   the   TCAS   during   this   time.   Traffic  advisory  traffic  may  be  upgraded  to  resolution advisory   traffic   depending   upon   the   intruders   flight path. Table 3B-108.  Traffic Advisory Chart ALTITUDE (FEET) SECONDS TO CPA Up to 1000 AGL 20 1000 – 2350 AGL 25 2350 AGL – 5000 BARO 30 5000 – 10,000 BARO 40 10,000 – 20,000 BARO 45 20,000 – Above BARO 48 The  upgraded  traffic  advisory  is  displayed  as  a solid red square.  At this time the intruder is upgraded to  an  RA  and  an  aural  alert  advising  flight  action  is initiated.   The  aural  alert  varies  on  the  action  required to achieve maximum vertical separation between your aircraft and  the  intruder.    See  Table  3B -107  for  Aural Alert Messages.  Intruders become a threat and an RA will  be  issued  when  the  limits  in  Table  3B-109  are exceeded. (5)   Resolution Advisory Display. RA maneuver  guidance  symbols  are  red  and  green  arcs superimposed   on   the    vertical    speed    scale    of    the vertical speed indicator.