DISPLAY INFORMATION
Messages concerning bearing information are displayed on two lines of text in the upper right side of
the TCAS window whenever the system encounters an RA or TA target that has range but no
bearing information for display. The color of each line is based on the intruder type. The first line
contains the message RA NO BRG in red for an RA without bearing and the second line contains the
message TA NO BRG in amber for a TA without bearing information.
The TCAS range ring boundary is a white full arc shown at the limits of the display window. The
distance between the arc and the aircraft symbol is displayed in NM to the right of the arc.
The range ring is proportional to the selected range on the MFD, since the MC-800 MFD controller
controls the map/plan mode range.
TCAS uses four color-coded symbols to map traffic and to locate aircraft which present a potential
threat on the MFD. These symbols are a red solid square, an amber solid circle, a cyan solid
diamond, and a hollow cyan diamond. These symbols represent traffic which has been identified and
determined to pose a level of threat respectively as, resolution advisory (RA), traffic advisory (TA),
proximate traffic, and other traffic.
Red represents an immediate threat to TCAS equipped aircraft, and prompt action is necessary to
maneuver for avoidance. Red color is used only in conjunction with a resolution advisory (RA).
Amber represents a moderate threat (traffic advisory or TA) to TCAS equipped aircraft and a visual
search is recommended to prepare for avoidance of the intruder. Amber is only used in conjunction
with traffic advisory (TA) traffic. Other traffic is represented by cyan color.
RADIO ALTIMETER
Honeywell AA-300
The Honeywell AA-300 radio altimeter displays radio altitude at all times up to an absolute altitude of
2500 feet. The system becomes operational when the airplane electrical system is powered up and it
remains operational throughout the flight. Radio altitude is displayed in green digits located in the
bottom center of the attitude sphere in the ADI displays.
The altitude display in the ADIs operates from -20 to 2500 feet. Between 200 and 2500 feet, the
display is in ten feet increments. Below 200 feet, it is in 5-foot increments. Above 2500 feet, the
display will disappear.
The radio altitude minimums (RA) selection is displayed digitally in the lower right side of the ADI
display. It is selected by means of the DH/TST knob on the DC-550 display controller. The ADI radio
altitude decision height range is from 200 to 999 feet in 10-foot increments and in 5-foot increments
from 5 to 200 feet. Full counterclockwise rotation of the DH/TST knob on the DC-550 display
controller removes the radio altitude DH display. A decision height warning tone will sound when the
airplane reaches the decision height set on the pilot's ADI.
The decision height warning tone is controlled only by the DH setting in the pilot’s ADI. The copilot's
attitude sphere decision height selection has no effect on the sounding of the DH warning horn.
When the airplane descends below an altitude of 100 feet above the selected radio altitude decision
height, a black box with a white background appears in the upper left side of the ADI. When the
decision height is reached, an amber MIN appears inside the box. The display flashes for ten
seconds and then goes steady.
Cessna Citation XLS - Instrumentation & Avionics
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