User's Manual Part 2

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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4--21

Table 4--1. TT--950/951/952 T

CAS Computer Unit Interface Description (cont)

Connector Pin

Designation

Functional Description

LMP --3 Bottom Antenna 180 Degree Port

J3 on the antenna is color--coded blue. Same as top antenna (Note 2) 180 degree port

(LTP--3).

LMP --4 Bottom Antenna 270 Degree Port

J4 on the antenna is color--coded red. This antenna port (Note 2) is called the 270

degree port because it produces a transmission pattern in the left wing quadrant of the

aircraft. J4 is physically located toward the right wing of the aircraft when properly

installed. The TCAS function checks the built in dc to ground resistance of this antenna

port. It must detect approximately 2000 Ohms or it reports antenna test failure.

CAS Computer Unit Left Bottom Plug (LBP)

LBP--1 115 Vac Power Input (H)

This pin along with the 115 Vac Power Input (C) line (pin LBP--7) provides the 115 Vac

power requirements for the TT--950/--952 T

CAS computer units.

Wiring requirement is a standard #20 AWG.

NOTE: The T

CAS computer unit operates with either 115 Vac, 400 Hz, or +28 Vdc

input power. If 115 Vac is used, the power should be connected through a

5 Amp circuit breaker, and the pins for the +28 Vdc input should be left

unconnected.

LBP--2 Spare Pin

LBP--3 +28 Vdc Power Return (LO)

See LBP--10.

LBP--4 Spare Pin

LBP--5 Fan 115 Vac Power Output (H)

This pin along with the Fan 115 Vac Output Power (C) line (pin LBP--9) provides 115 Vac

power for an external fan.

LBP--6 Spare Pin

LBP--7 115 Vac Power Input (C)

See LBP--1.

LBP--8 Signal Ground

Connect to Aircraft Signal Ground.

LBP--9 Fan 115 Vac Power Output (C)

See LBP--5.