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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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E. TA/VSI
The TA/VSI displays resolution advisory maneuvering data to the pilot during threat conditions.
The TA/VSI also supplies a display of airspace traffic conditions in the traffic display range and
altitude volume limits. See Figure 13.
(1) Resolution Advisories
Resolution advisories can be corrective or preventive and positive or negative.
A corrective advisory requires a vertical maneuver and is always shown with red and
green arcs. The red arc shows the vertical speed rates that are not permitted in the
presence of the RA. The green arc shows the vertical speeds that must be flown during
a corrective advisory. A preventive advisory requires no maneuver and is represented
with only a red arc. (Refer to the TCAS Pilot Manual.)
The limits of the red arc are supplied to the TA/VSI from the TCAS through the 429 bus.
The limits of the green arc are not supplied from TCAS. The green arc will be
immediately adjacent to the red arc and have a width of approximately equal to the space
between 1500 ft/min and 2000 ft/min.
It is possible to show two red arcs at the same time with an RA for example, do not climb
more than 1000 feet and do not descend more than 2000 feet. Since one procedure can
be corrective, the green arc will be immediately adjacent to the red arc representing the
corrective advisory. If the two procedures are preventive, only the red arcs are present.
(Refer to Table 21 for TA/VSI RAs and Audio Messages.)
(2) Traffic Display
The traffic display supplies the following data:
•
The standard symbol has own aircraft symbol, and a two mile range ring
marker.
•
Resolution advisory, traffic advisory, proximity, and nonthreat category aircraft
symbols that show the range, bearing (if tracking is occurring on a directional
antenna), and altitude (if the intruder aircraft is reporting altitude).
•
Numerous text message annunciations relating to the presence of TAs and
RAs that can not be displayed by a symbol because bearing is not available.
TAs and RAs that are outside the range scale of the traffic display show
operating modes and fail conditions.
NOTE:
A
pilot manual supplied by Honeywell gives the TA/VSI operation in detail.
