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transponder is reporting altitude, the relative altitude is also determined.
If the system predicts that safe boundaries may be violated, the
system issues a Traffic Advisory (TA) which is displayed on the MFD.
Should the TCAS II processor determine that a possible collision exists,
it issues visual and audio advisories to the crew to initiate appropriate
vertical avoidance maneuvers.
If an aircraft has a transponder, but does not have altitude reporting,
the TCAS will depict it on the TA display, but without the altitude information
tag, and without the capability of providing evasive commands.
TCAS II is capable of generating a TA display of traffic from
Mode A transponder-equipped aircraft, and it is also capable of generating
RA signals to avoid Mode C-equipped aircraft. For similar
Mode S-equipped aircraft, the airplane’s TCAS II system coordinates
evasive maneuvers for both aircraft. TCAS I can process transponder
information from other aircraft equipped with Mode A, C, or S transponders,
but does not receive altitude information to compute or coordinate
a Resolution Advisory (RA). If the depicted traffic is reporting
altitude and is climbing or descending at a rate of at least 500 feet per
minute, a trend arrow is displayed beside the traffic symbol indicating
that the aircraft is climbing or descending. If the intruder is not reporting
altitude, the traffic symbol appears without an altitude tag or trend
arrow. The RA displays are incorporated into the vertical speed indicator
on the PFDs. Green FLY-TO zones and red NO-FLY zones are placed
on the vertical speed arc by the TCAS for collision avoidance. The zones
are not displayed on the arc until the TCAS detects an RA intruder and
computes the collision avoidance data. Synthesized voice commands
and announcements are issued by the TCAS over the airplane audio
system.
Pilot’s Manual
5-58 PM-126A
SYSTEM CONTROLS AND DISPLAYS
Selection of the TA or TA/RA (TCAS II) modes is accomplished
through the transponder window on either RMU main radio tuning
page. After the cursor is placed over the transponder mode line, the desired
mode is selected with the RMU tuning knob. The transponder selection
options for TCAS I equipped aircraft will be STANDBY, ATC
ON, ATC ALT and TA. Selections available with TCAS II include the
same as TCAS I plus TA/RA. The selected TCAS mode will be annunciated
in the top left corner of the TCAS display. The auto or manual
mode can be selected on the ATC/TCAS CONTROL PAGE of the RMU.
This page is accessed through the RMU PAGE MENU page. When
AUTO is selected, traffic targets display only when a TA or RA target
condition exists. When manual is selected, all traffic targets within the
viewing airspace are displayed. In either the MAP or PLAN format display,
the TCAS TA display is selected by pushing the TCAS menu key
on the MFD Main Menu bezel controller. If the TCAS triggers an RA,
and TCAS display is selected OFF, the main menu is activated on the
MFD. This allows flight crew selection of TA displays with a single button
push. This display is in addition to the resolution advisory on the
VSI display on the PFD (TCAS II only).
TRAFFIC DISPLAY SYMBOLS
TCAS I will display three different traffic symbols and TCAS II four
with the addition of Resolution Advisories (RA). The type of symbol selected
by TCAS is based on the intruder’s location and closing rate. The
symbols change shape and color to represent increasing levels of
urgency. The traffic symbols may also have an associated altitude tag
which shows relative altitude in hundreds of feet, indicating whether
the intruder is climbing, flying level or descending. A + sign and
number above the symbol means the intruder is above your altitude.
A - sign and number beneath indicates it is below your altitude. A trend
arrow appears when the intruder’s vertical rate is 500 feet per minute
or greater. The symbology displayed on the PFDs and MFD is as follows:
(1) NON-THREAT ADVISORY (OA) TRAFFIC — An
open cyan diamond indicates that an intruder’s relative
altitude is greater than ± 1200 feet, or its distance is
beyond 6 nm range. It is not yet considered a threat.
(2) PROXIMITY INTRUDER (PA) TRAFFIC — A filled
cyan diamond indicates that the intruding aircraft is
within ± 1200 feet and within 6 nm range, but is still
not considered a threat.
Pilot’s Manual
PM-126A 5-59
(3) TRAFFIC ADVISORY (TA) TRAFFIC — A symbol
change to a filled amber circle indicates that the intruding
aircraft is considered to be potentially hazardous.
Depending on your own altitude TCAS II will display
　
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