reversals represent more urgent situations and should
be acted upon within not more than 2.5 seconds.
The RA (either preventive or corrective)
may downgrade to a TA when the intruder
begins diverging from your aircraft. When
the RA changes to a TA, the vertical speed
maneuver guidance arcs are removed and
the aural message, "Clear Of Conflict" is
g. TA Only. In the TA-only mode the display
will appear as shown in Figure 3C-153. The TA only
mode can be manually selected on the transponder/
TCAS control panel or automatically in certain
situations, such as when below 100 feet AGL. The
display will show the ONLY TA flag in message slots 1
and 2 and also that the 6-nm range is selected.
The TA ONLY mode does not identify RA
intruders and will not generate corrective
or preventive RA displays. If an RA threat
level aircraft is present, the display will
show it as a TA target when the TA ONLY
mode is selected.
h. Corrective RA. Figure 3C-154 shows a
corrective RA display advising immediate action to
provide maximum aircraft separation at CPA. The
indication shows the flight path correction's having
been started. The aircraft is descending through
650 fpm to exit the vertical speeds indicated by the red
arc. Desired vertical speed is indicated by the green
arc, 1500 to 2000 fpm, down.
(1) The maneuver is being performed to
avoid the threat traffic indicated by the solid, red,
square. The traffic is at 1/2 mile and 12 o'clock,
200 feet above your altitude and level.
Figure 3C-153. TA ONLY Operational Situation