User's Manual

Table Of Contents
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 5-2: Computer Unit Harness Checkout
Connector Pin No.
Pin Function
P1C-1 (LBP)
115 V ac (H) T
3
CAS Power
P1C-5 (LBP)
115 V ac (H) External Fan
P1C-10 (LBP)
28 V dc T
3
CAS Power
B. T
3
CAS Controller and Display Unit Harness Checkout
Refer to the applicable controller and display unit interconnect diagrams to do continuity
measurements and to ensure confidence in wiring for these units.
C. LRU Pre-installation Power Checkout
Before you do any operational tests, a power-on check is recommended to reduce the
possibility of damage to newly installed system components due to miswired power
leads.
(1) Make sure all T
3
CAS system components are removed from their mounting trays
or that their aircraft mating connector(s) are disconnected.
(2) Connect external power to aircraft.
(3) Close all T
3
CAS system 115-volt, 400-Hz circuit breakers, if applicable, and
check for 115 volts ac at the appropriate LRU mating connector pins. Refer to the
applicable interconnect diagrams for LRU pin numbers.
(4) If power is misapplied on any connector pin, open the circuit breaker and rework
miswired harness.
(5) Remove aircraft power.
D. Initial System Installation Operational Test
The initial checkout of a newly installed system should start with a system self-test and
then be followed by a ramp test. The system self-test procedures are referenced in
paragraph 4.A. The ramp tests should include a Scenario Test and a Power and
Frequency Test. Refer to the applicable TCAS/Transponder Ramp Tester Operation
Manual for procedures to do these tests.
If an ACSS VSI/TRA is used as the display instrument, it contains a feature that displays
some typical installation errors. See Figure 5-1. If an error is detected during initial
installation checkout, the VSI/TRA displays the error as follows:
(1) Removes all symbology from the display
(2) Displays a red X that covers the entire screen
(3) Displays a two-digit error code as follows:
00 = Invalid discrete setting at power-up
5-2
04 Nov 2014
34-45-29
Pub. No. 8600200-001, Revision 004
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