User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
If during the 10-second fault display period, the TEST button is activated
again, the fault display period is aborted, a 2-second lamp test cycle is
done, and the fault data recorded for the preceding flight leg is displayed
for 10 seconds. This procedure can be repeated up to 10 times to obtain
recorded data from the previous 10 flight legs. If the TEST button is not
activated again during the fault display period, the fault display cycle is
terminated at the end of the 10-second fault display period and all
annunciators are extinguished. If an attempt is made to display fault data
for the preceding flight leg when the tenth preceding flight leg fault data
is displayed, all annunciators flash for a 3-second period at a 2.5-Hz rate,
after which all annunciators are extinguished.
When less than 10 flight legs have been flown since the T
3
CAS
Computer Unit was shop tested and recertified, less than 10 previous
flight legs of recorded fault data may be available for display. In this
case, if an attempt is made to display fault data for the preceding flight
leg when the earliest flight leg is displayed, all annunciators flash for 3
seconds at a 2.5-Hz rate and then all annunciators are extinguished.
The T
3
CAS Pass/Fail status annunciator indicates the status of the
T
3
CAS Computer Unit only. All other annunciators reflect the condition of
the respective sub-system.
(b) TCAS Self-Test
The T
3
CAS TCAS self-test is initiated from a self-test button on the
TCAS/MODE S control panel. The T
3
CAS TCAS self-test may also be
initiated from the Central Maintenance Computer.
(c) TAWS/RWS Self-Test
The T
3
CAS TAWS/RWS self-test is initiated from a self-test discrete
input interface. The TAWS/RWS self-test discrete is further defined in the
ASDB. The T
3
CAS TAWS/RWS self-test may also be initiated from the
Central Maintenance Computer.
(d) Transponder Self-Test
The T
3
CAS XPDR self-test is initiated from a self-test button on the
TCAS/MODE S control panel. The T
3
CAS XPDR self-test may also be
initiated from the Central Maintenance Computer.
(8) TAWS/Transponder Pin Programming
For Part Numbers 9005000-10000, -10101, -10202, -10204, -11203, -11801 and
-55801 pin programming defines the operational environment of the T
3
CAS
including the aircraft type, input/output interfaces, climb gradient, and feature
selections. There are 18 program pins used for pin programming TAWS and
transponder functionality. Each of the 18 program pins can be set to one of 9
states by strapping each program pin to one of eight T
3
CAS output discretes or
leaving the connection open. During power-up initialization, the T
3
CAS cycles the
states of the output discretes to determine its operating configuration.
Valid program pin configuration monitoring is provided via a parity pin that is
connected in such a manner that the sum of program pin connections results in
an odd number.
Pub. No. 8600200-001, Revision 004
34-45-29
1-60
04 Nov 2014
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