User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
Page 152
15 Dec 2005
(c) Test Mode
Pushing the TEST button on the control panel starts a selftest program which
verifies proper operation of the TA and RA displays and of the aural advisories
on the audio system.
The test mode does not affect normal TCAS operation, provided the selected
transponder remains in normal operation during the test cycle. Should a TA or
RA occur during the test sequence, the test aborts, and the advisory is
announced and displayed.
The test mode just described excludes extended selftests performed on the
ground, where TCAS is inoperative.
(2) NonTCAS 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.
(3) Extended Test Mode
The purpose of the extended test mode is to facilitate diagnosis in the event
selftest has failed. Like selftest, 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. Holding TCAS TEST pushed for longer than
eight seconds in this condition activates 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.