Beechcraft C-12C Operator And Technical Reference Manual page 566

TM 1-1520-218-10
threat, but are displayed to assist the flight crew in
visually acquiring the intruders.
(4) Traffic Advisory Traffic. TA aircraft are
displayed as yellow solid circles.
intruder is upgraded to a TA, the aural alert, "Traffic,
Traffic" is annunciated.
within the limits from the CPA shown in Table 3C-112.
This gives the crew time to visually acquire the
intruding aircraft. No maneuvers will be commanded
by the TCAS during this time.
upgraded to RA traffic, depending upon the intruders
flight path.
Table 3C-112. Traffic Advisory Chart
ALTITUDE (FEET)
Up to 1000 AGL
1000 – 2350 AGL
2350 AGL – 5000 BARO
5000 – 10,000 BARO
10,000 – 20,000 BARO
20,000 – Above BARO
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. Refer to Table
3C-111 for aural alert messages. Intruders become a
threat and an RA issued when the limits in Table
3C-113 are exceeded.
Table 3C-113. Resolution Advisory Chart
ALTITUDE (FEET)
Below 900 AGL
Below 1100 AGL
1000 – 2350 AGL
2350 AGL – 5000 BARO
5000 – 10,000 BARO
10,000 – 20,000 BARO
20,000 – Above BARO
(5) Resolution
maneuver guidance symbols are red and green arcs
superimposed on the vertical speed scale of the
vertical speed indicator.
3C-212
At the time an
A TA is an aircraft that is
TA traffic may be
SECONDS TO CPA
20
25
30
40
45
48
SECONDS TO CPA
RA not issued if
descending
RA not issued if
climbing
15
20
25
30
35
Advisory Display.
Two types of RA's may be displayed, a
preventive and a corrective.
indicates a vertical speed range or pitch that is to be
avoided while maintaining the present flight path. A
corrective advisory indicates a necessary change in
flight path by displaying a vertical speed range or pitch
to be flown to. Either advisory serves to ensure that
the maximum separation between the aircraft and an
intruder is maintained. Refer to Table 3C-114.
Table 3C-114. Resolution Advisory Inhibits
Radio Altitude
Below 1450 FT AGL
Below 1000 FT AGL
descending;
1200 FT AGL climbing
Below 900 FT AGL
descending;
1100 FT AGL climbing
(a) Preventive Advisory. The preventive
advisory is an RA that occurs when the TCAS has
determined that a threat exists, but that the current
vertical speed or pitch will result in sufficient
separation from the intruder. The general conditions
for a preventive advisory occur when the intruder is
within 300 to 800 feet (relative altitude), the range
separation is decreasing, and there are approximately
25 seconds to the CPA. The RA display will show a
red vertical-speed arc indicating speeds or pitches to
avoid. No other action is advised.
(b) Corrective Advisory. This is an RA
that occurs when the TCAS has determined that the
flight crew should take action to change vertical speed
or pitch to avoid an intruder.
threat aircraft is within 300 feet (relative altitude), the
range separation is decreasing, and there are
approximately 25 seconds to the closest point of
approach. The TCAS will provide the flight crew with a
recommended vertical speed or pitch to provide
maximum aircraft separation at the closest point of
approach. The corrective advisory consists of one or
two red arcs and a green arc. As with the preventive
advisory, the red represents vertical speed or pitch
ranges that are to be avoided.
RA
corrective advisory command within approximately
5 seconds after it is issued. Strengthened (increased
climb or increased descents) resolution advisories or
A preventive advisory
Resolution Advisory
Status
INCREASE DESCENT
RA inhibited
DESCEND RA inhibited
Below
All RA's inhibited (TA
Below ONLY) and TA Aural
Message inhibited.
1 This advisory occurs when the
2 The pilot should act on the