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A. Traffic Advisory
The traffic advisory (TA) is issued to indicate the relative positions of intruding airplanes
that are about 45 seconds from the closest point of approach.
The traffic advisory allows the flight crew an opportunity to visually locate the intruding
aircraft. The advisory is always displayed on the PFDs or can be displayed on the
TCAS page of the MFD if selected from the display control panel.
Traffic advisory will be displayed automatically when the airplane is 1000 feet or below,
and will revert to pre-selected mode automatically when the airplane is above
1000 feet.
B. Resolution Advisory
Resolution advisories (RA) will direct the flight crew to resolve a threat by executing an
aircraft maneuver that will increase separation. This occurs when the TCAS computer
predicts that the intruding aircraft is within about 30 seconds from the closest point of
approach.
Resolution advisories are displayed on the vertical speed indicator (VSI) portion of the
PFD. The VSI shows the appropriate vertical maneuver to avoid the threat. The VSI
provides vertical guidance to maintain safe vertical separation as follows:
S Corrective RAs -- Fly from the red zone to the green zone.
S Preventive RAs -- Do not fly into the red zone.
The vertical maneuver is also accompanied by TCAS voice warnings.
NOTE
The TCAS resolution advisory programs are based on
the pilot initiating the RA maneuver within
approximately 5 seconds. If an additional corrective
resolution advisory is issued (e.g. a reversal), the
maneuver must be initiated within 2.5 seconds.
NAVIGATION SYSTEMS Vol. 1 18--70--6
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Traffic Collision Avoidance System --- Primary Function Display Indications <1015>
Figure 18---70---5
TCAS Message Area
TRAFFIC (red) -- Indicates TCAS resolution
advisory (flashes for first 10 seconds).
TRAFFIC (amber) -- Indicates TCAS traffic
advisory (flashes for first 10 seconds).
TCAS FAIL (amber) -- Indicates TCAS
system failure.
TCAS RA FAIL (amber) -- Indicates PFD is
unable to display TCAS resolution advisory.
TA ONLY (white) -- Indicates that TCAS has
been selected to traffic advisory only mode,
or has been automatically selected when the
aircraft is below 1,000 feet. Flashes amber
when traffic advisory is present.
TCAS OFF (white) -- Indicates that TCAS
has been selected to standby mode.
TCAS TEST (white) -- Indicates that TCAS
system is in test.
Resolution Advisory
Arc on vertical speed scale displays
collision avoidance instructions.
Red band -- Range to be avoided.
Green band -- Target range or
range to be maintained.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Vertical speed pointer and readout
turn red when a TCAS resolution
advisory is issued and speed is not
within corrective limits.
1 2 4
1 2 4
0.0
NOTE:
NAVIGATION SYSTEMS Vol. 1 18--70--7
Traffic Alert and Collision Avoidance
System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Traffic Collision Avoidance System --- Multifunction Display Indications
Figure 18---70---6
Multifunction Display -- TCAS Mode
Pilot’s and Copilot’s Instrument Panels
TCAS FAIL (amber)
Indicates TCAS system
failure.
Range Rings (white)
Outer ring indicates range
selected at the display
control panel. Inner ring
indicates half range (not
available at 5 NM range
selection). Inner markings
indicate 3 mile range (not
available at 40 NM range
selection).
TCAS No Bearing Table
Displayed when intruder
bearing information can not
be detected or calculated.
Indicates intruder type, range
and altitude. Traffic advisory
displayed in amber and
resolution advisory displayed
in red. Only two nearest
intruders are displayed.
Traffic Selection (white)
Displayed when other
TCAS DISPLAY FAIL (amber) traffic is selected off.
Indicates TCAS display mode
is not available.
TCAS Mode (white)
Displays mode selected
on radio tuning unit.
TCAS OFF -- Mode
selected to standby.
TA ONLY -- Mode
selected to traffic
advisory only.
Altitude Range (white)
Displays altitude range
selected on radio tuning
unit.
Current Altitude (white)
Displays current altitude in
thousands of feet, when
altitude format is selected
to absolute.
TCAS TEST (white)
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