User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
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Page 54
15 Dec 2005
At the completion of the test (8seconds), the words “tcas test pass” should be
transmitted once aurally. In addition, the test pattern is removed from the display(s)
and a TCAS PASS annunciation is displayed. If the test fails, the words “tcas test
fail” are transmitted once aurally and a TCAS FAIL annunciation is displayed on the
applicable display(s).
If the TCAS short test fails, do the TCAS Computer Unit SelfTest procedures
referenced in paragraph 4.B. to determine which LRU or subsystem is not functioning
properly. To troubleshoot the system, refer to the procedures in the FAULT
ISOLATION section.
(2) Extended Test Mode
The extended test mode provides a flight deck initiated test that displays various
pages of text information that is selected by the ATC Mode S control panel 4096
code switches. This test mode is accessible only when on the ground and cannot be
initiated while airborne.
The extended test mode is used for maintenance purposes only. It displays various
pages of text information containing the TCAS software part number, fault messages,
status of program pins, analog and digital inputs, and other aircraft parameters.
To start the test, push and hold the TEST button/switch on the ATC/TCAS controller
for a minimum of 9 seconds. In addition the conditions that follow must occur:
TCAS is in Standby
The selected transponder is in Standby
Aircraft is on the ground (The AIR/GND discrete [RMP5K] is grounded)
Landing gear is extended (Landing Gear discrete [RMP13F] is grounded).
Once the extended test mode is established, the 4096 code switches on the
ATC/TCAS controller are used to select the desired maintenance page for display.
Table 53 lists the extended mode page names and numbers and the corresponding
4096 Ident Code number.