User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
5--9
Upon activating the Extended Self--Test the T
2
CAS unit will display the Extended
Self --Test Introduction page on both the captain’s and first officer ’s TAWS displays.
While in the Extended Self--Test:
(a) The T
2
CAS unit will display the next Extended Self --Test page when the self--test
discrete input (RTP--10E) is active for less than or equal to three seconds.
(b) Each subsequent activation of the self--test discrete input will result in the T
2
CAS
unit displaying the next Extended Self --Test page.
(c) The following is a listing of Extended Self--Test information pages available for
display:
Information Displayed Pages
Introduction 0, 1
Part Numbers 2, 3, 4, 5, 6
The T
2
CAS unit will exit the Extended Self --Test when the self--test discrete input
(RTP--10E) is active for greater than three seconds or the aircraft transitions from
ground to air (RMP --5K = OPEN).
C. T
2
CAS Computer Unit Self--Test
The Front Panel has a test switch to initiate testing of T
2
CAS as well as LED indicators
which are used for the annunciation of internal LRU o r external system faults for T
2
CAS.
There are two sets of LED indicators, one set pertains to the TCAS function and TCAS
external I/O; the other set pertains to the TAWS/RWS and internal GPS functions.
The testing for T
2
CAS is initiated through the test switch on the front of the LRU. TCAS
and TAWS/RWS functions both monitor the switch and initiate a test sequence when the
switch is pressed. The test results for both functions are annunciated on their respective
LED displays.
(1) With all power off, reinstall the T
2
CAS computer unit in its mounting tray. Make sure
the TCAS control panel and display(s) are also installed.
(2) Apply aircraft power and close all applicable T
2
CAS system circuit breakers.
(3) On the TCAS control panel, set the ATC/TCAS controller mode switch to Mode S ON.
(4) Push the PUSH TO TEST button on the T
2
CAS computer unit front panel. The
TCAS and TAWS/RWS test sequence that follows should occur:
• All TCAS computer unit front panel annunciators come on for a 3-- second lamp
test.
• If the TCAS is operational, the TCAS PASS green annunciator comes on for a
10-- second display period and then goes off.