TM 1-1520-218-10
3C-214
A/B
Figure 3C-154. Corrective RA Operational Situation
(2) At the same time this traffic was
upgraded from a TA to an RA display, the aural alert
"Descend, Descend, Descend" would have been
annunciated.
(3) Proximate traffic is also shown on this
display. The solid diamond at 11 o'clock and 3.5 miles
is 300 feet above your own altitude and descending. It
poses no present threat, but is within the 6-mile,
± 1200 feet relative altitude range. The other
proximate traffic is at 2 o'clock and 4 miles, 500 feet
below your altitude and climbing. It does not pose a
present threat.
(4) Two corrective commands may be issued
if the initial corrective command does not provide the
desired aircraft separation. When the threat aircraft
maneuvers in a direction that results in a conflict if
your own aircraft continues with the previously
recommended maneuver these will occur.
(5) An increase advisory, either climb or
descend at 2500 fpm to 3000 fpm, will occur if the
previous 1500 fpm to 2000 fpm rate of climb or
descent is no longer adequate. This display will be
accompanied by an aural annunciation of, "Increase
Climb, Increase Climb" or "Increase Descent, Increase
Descent," as appropriate for the advisory.
(6) A reversal advisory, a climb advisory after
a descend advisory, or a descend advisory after a
climb advisory will occur if the TCAS determines that
the initial advisory should be reversed. An example of
when this advisory would occur would be when the
intruder causing the initial climb advisory was above
you descending into your aircraft's flight path, then
alerted its flight path to present a new conflict if your
aircraft were to continue to climb.
(7) Reversal advisory displays will also
initiate an aural annunciation of "Climb, Climb Now;
Climb, Climb Now" or "Descend, Descend Now;
Descend, Descend Now."
i.
Preventive RA. Figure 3C-155 shows a
preventive RA display. Your aircraft is descending at
1700 fpm. The red arc advises that you should not
climb at any vertical speed to avoid the threat aircraft
at 12 o'clock and 600 feet above you. When this traffic
was upgraded from a TA to an RA display, an aural
annunciation of "Monitor Vertical Speed, Monitor
Vertical Speed" would have been heard.
(1) Proximate traffic is also shown in this
display. The solid diamond at 11 o'clock and 3.5 miles
is 700 feet above your own altitude and descending.
The other proximate traffic at 2 o'clock and 4 miles is
100 feet below and climbing. Neither of these
intruders poses a threat.
