User's Manual Part 1

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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1--61

Test Mode

Pushing the TEST button on the control panel starts a self-- test 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 self -- tests performed on the

ground, where TCAS is inoperative.

(b) 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 o n 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.

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.