Ta/Vsi Display; General; Resolution Advisory Display - Honeywell CAS-100 Maintenance Manual

C. TA/VSI Display
(1)

General

The IVA-81A/D Resolution Advisory/Traffic Advisory/Vertical Speed Indicator (TA/VSI)
display is a high resolution, sunlight readable, full color, liquid crystal display (LCD)
(Figures 2011, 2012, and 2013). The indicator lets resolution advisory and traffic data be
shown in the space previously for display of vertical speed only. Vertical speed is shown
on a standard circular dial with a pointer. Resolution advisories are shown as red or
red/green arcs (eyebrows) on the applicable part of the circular vertical speed dial.
The center of the display is a horizontal situation presentation of the traffic around the
aircraft that includes intruder altitude and vertical direction. Traffic is divided into four
categories by the threat risk and identified on the display by the symbol color and shape.
The text messages are shown for TCAS and display modes, intruder data, and vertical rate
input validity.
The display intensity level is controlled by a group of bezel and remote light sensors and
by the lighting bus input. An optional bezel attached intensity control is also available.
Traffic display range control can be supplied at a distance from a Control Unit or locally
through an optional bezel attached range control.
An optional traffic select (TA SEL) switch lets deselection of traffic format when a TA or RA
is present.
The TA/VSI accepts air data ARINC 565 or ARINC 575 analog input, ARINC 575 digital or
ARINC 429 high and low speed input, and pneumatic vertical speed input.
(2)

Resolution Advisory Display

The resolution advisory commands shown on the TA/VSI (or RA/VSI) are the primary
indications for vertical maneuvering guidance. TCAS resolution advisories on the two
TA/VSI (or RA/VSI) units show vertical speeds to be used or prevented to keep or get safe
vertical separation.
A pointer and vertical speed scale, which are standard VSI features, show the present
vertical speed of own aircraft. For TCAS guidance, the TA/VSI shows red and green
command arcs on a liquid-crystal display with the vertical speed scale and pointer.
The red and green RA command indications give corrective or preventive resolution
advisory maneuvering guidance to the pilot (see Controls and Indicators, paragraph 7).
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
34-45-47
Page 54
1 Dec 2003