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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-132A
SYSTEM CONTROLS AND DISPLAYS
Selection of the TA/RA mode 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 II equipped aircraft will be STANDBY, ATC ON, ATC ALT and
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 button 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.
TRAFFIC DISPLAY SYMBOLS
TCAS II will display four different traffic symbols. 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-132A 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
a TA when time to the closest point of approach (CPA)
is between 20 and 48 seconds. An advisory voice message
“TRAFFIC, TRAFFIC” may be heard through the
audio system.
(4) RESOLUTION ADVISORY (RA) (TCAS II only) — A
solid red square indicates that the intruding aircraft is
projected to be a collision threat. TCAS II calculates
that the intruder has reached a point where a resolution
advisory is necessary. The time to closest approach
with the intruder is now between 15 and 35 seconds,
depending on your altitude. The symbol appears with
an audio warning and a vertical maneuver indication
on the PFD VSI.
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS)
EGPWS is shown on the MFD by pushing the EGPWS menu button on
the MFD main menu. When TERRAIN is selected for display, the
EGPWS sends the terrain data directly to the MFD display unit via the
WX picture bus and replaces the WX display with terrain information.
If a potential terrain hazard is sensed by the EGPWS, terrain data automatically
pops up on the MAP. This “pop-up” mode defaults to the
10 NM range. EGPWS annunciators are described in the table below
　
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