TM 1-1510-225-10 3B-187 Table 3B-106.  TVI-920 Transponder/TCAS Mode/Warning Flags and Messages SLOT NUMBER SYMBOL INTERPRETATION 1 6NM or 12NM Selected forward range of traffic display. 1 & 2 TCAS OFF TCAS set to standby, either manually or automatically. 3 TEST TCAS set to test mode. 3 & 4 No bearing message (Red if RA; yellow if TA) Range  and  altitude  of  RA  or  TA  intruders  for  which  no  bearing information is available. 4 ABV Traffic  displayed in altitudes from +9900 ft to  –2700 ft, relative to own  aircraft.    (If  no  message  is  displayed,  traffic  display  is  from +2700 ft to  –2700 ft relative to own aircraft.) 4 BLW Traffic displayed in altitudes from  –9900 ft to +2700 ft, relative to own  aircraft.    (If  no  message  is  displayed,  traffic  display  is  from +2700 ft to  –2700 ft relative to own aircraft.) 5 V/S Vertical speed is unreliable, or system is in test mode. 6 & 7 ONLY T/A TCAS  set  to  TA-only  mode.    If  TA  occurs,  message  and  box border change to yellow. 7 R/A Resolution advisory or vertical speed is unreliable. 7 TCAS TCAS functions have failed. Table 3B-107.  Aural Annunciator Messages MESSAGE INTERPRETATION Traffic Advisory Annunciation Traffic; Traffic Traffic    has    entered    20    to    48    second    envelope.   (Symbol has changed to solid yellow circle.) Resolution Advisory Annunciations (Maneuver should begin within 5 seconds) Climb; Climb; Climb Climb at rate shown on vertical speed indicator. Climb-Crossing Climb; Climb-Crossing Climb Climb at rate shown on vertical speed indicator.  Flight path will cross intruder's flight path. Reduce Climb; Reduce Climb Reduce    rate    of    climb    to    that    on    vertical    speed indicator. Descend; Descend; Descend Descend at rate shown on vertical speed indicator. Descend,    Crossing    Descend;    Descend,    Crossing Descend Descend  at  rate  shown  on  vertical  speed  indicator.   Flight path will cross through intruder's flight path. Reduce Descent; Reduce Descent Reduce   rate   of   descent   to   that   shown   on   vertical speed indicator. Monitor Vertical Speed; Monitor Vertical Speed Monitor   present   vertical   speed   to   prevent   entering restricted (red arc) vertical speed. Increased Action Resolution Advisory Annunciations (Maneuver should begin within 2 1/2 seconds) Increase Climb; Increase Climb Follows   "Climb"   advisory   due   to   intruding   aircraft's maneuvering.  Rate of descent of own aircraft should be increased.