2.
J. Traffic Alert and Collision Avoidance System (TCAS) Displays
(1) TCAS
General
The TCAS system determines the range, altitude and bearing of other
aircraft equipped with mode S or ATCRBS transponders with respect to
the location of own aircraft.
The system monitors the trajectory of
these target aircraft for the purpose of determining if any of them
constitute a potential collision hazard. The system is responsible
for estimating the separation at closest approach and determining if
a potential conflict exists. If so, the system displays a
resolution advisory on the vertical speed tape of the pilots and
copilots map mode o the navigation displays.
These displays are
crew selectable through the DC-884 Display Controllers.
The TCAS
system page
will automatically callup when the TCAS detects any
traffic advisory or resolution advisory target.
The TCAS
system is composed of the TCAS computer with inputs from
radio altimeters,
mode S computers, and through the mode S
computers, the air data computer.
In addition, the TCAS has two
directional antennas for range and bearing information. The TCAS
output information is sent to the symbol generators through two high
speed 429 buses.
Mode of operation is selected with the TCAS
adapter panel, but is dependent on selected mode S controller status
as well as internal and discrete logic, such as current radio
altitude, gear up/down, weight-on-wheels, and the ground proximity
warning system inhibit.
TCAS FAIL is displayed on the CAS in eventof failure, TCAS mode of
operation is displayed beside the PFD vertical speed tape, and an
extended test page is available on the ground on the TCAS system
page.
(2) TCAS Display Pages
The TCAS information is displayed in three primary areas: a TCAS
system page on DU 4, the map mode of the navigation display on
DUS 2 and 5, and the vertical speed tape on the PFD. The CAS is
used for a blue TCAS FAIL message.
(a) System Page Display (Figure 253.1) - The system page on DU 4 is
the primary traffic display and is selected by the crew through
either the DC-884 Display Controller or is called up by the
TCAS in the event of either a Resolution Advisory or a traffic
advisory. Like the ND, the system page is centered on an own
aircraft symbol and provides a fixed range fore and aft of six-
miles and side-to-side of five-miles. A two-mile range
ring-of-dots surrounds the aircraft symbol with a dot at each
clock hour position.
Targets that exceed the fixed range of
the display are shown as off-scale targets around the edges of
the display, and up to two lines of no bearing target
22-14-00
Page 298.36.1
Apr 15/93
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