User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
(c) Non-TCAS Modes
The control panel selections that follow disable TCAS operation and all
advisories:
● MODE S ON activates a Mode S transponder only
● STBY sets the selected transponder in standby mode
● ATC activates an ATCRBS transponder only
● ALT RPTG set to OFF inhibits altitude reporting.
When TCAS is inoperative as a result of control panel selection, TCAS
OFF is annunciated on the display. When TCAS is inoperative due to a
system failure, TA FAIL, RA FAIL, or TCAS FAIL is annunciated on the
display. In addition, if the transponder or the altitude data source fails,
the XPDR FAIL light on the control panel comes on.
(d) Extended Test Mode
The purpose of the extended test mode is to facilitate diagnosis in the
event self-test has failed. Like self-test, this mode is enabled by pushing
the TCAS TEST button, but only when TCAS is inoperative. The aircraft
must be on the ground, and the transponder must be set to STBY. Push
and hold the TCAS TEST button for longer than eight seconds to activate
the extended tests. This feature is not available on all systems. Refer to
the TESTING AND FAULT ISOLATION section for system requirements
and test description.
(11) Display Symbology
The TCAS modes use color-coded symbols and data tags to map air traffic and
locate threat aircraft on the RA/TA VSI display.
Four traffic symbols are used: solid circle, solid square, solid diamond, and
hollow diamond. See Figure 1-17 for examples. A different color is assigned to
each symbol type, as listed in Figure 1-17.
Table 1-21: TCAS Traffic Symbols
Graphic Symbol
Color
Display Function
Solid Circle Amber Traffic Advisory (TA)
Solid Square
Red
Resolution Advisory (RA)
Solid Diamond
Blue
Proximate Traffic
Hollow Diamond
Blue
Other Traffic
NOTES:
(1) TCAS traffic information displayed on EFIS displays such as crew alerting system
display, navigation display, electronic horizontal situation display or multifunction display,
Pub. No. 8600200-001, Revision 004
34-45-29
1-79
04 Nov 2014
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