User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
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Page 419
15 Dec 2005
Table 41. TCAS 3000 Computer Unit Loading/Gradient Specifications (cont)
Connector Pin
Designation
Functional Description
LMP2 Bottom Antenna 90 Degree Port
J2 on the antenna is colorcoded black. This antenna port is called the 90 degree port
because it produces a transmission pattern in the right wing quadrant of the aircraft. J2
is physically located toward the left wing of the aircraft when antenna is properly
installed. The TCAS computer unit checks the built in dc to ground resistance of this
antenna port. It must detect approximately 8000 ohms or it reports antenna test failure.
LMP3 Bottom Antenna 180 Degree Port
J3 on the antenna is colorcoded blue. Same as top antenna 180 degree port (LTP3).
LMP4 Bottom Antenna 270 Degree Port
J4 on the antenna is colorcoded red. This antenna port 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
computer unit checks the built in dc to ground resistance of this antenna port. It must
detect approximately 2000 ohms or it reports antenna test failure.
TCAS Computer Unit Left Bottom Plug (LBP)
LBP1 115 V ac Power Input (H)
This pin along with the 115 V ac Power Input (C) line (pin LBP7) provides the 115 V ac
power requirements for the TCAS computer unit.
NOTE: The TCAS computer unit operates with either 115 V ac, 400 Hz, or 28 V dc
input power. If 115 V ac is used, the power should be connected through a
5 Amp circuit breaker, and the pins for the 28 V dc input should be left
unconnected.
LBP2 Spare Pin
LBP3 +28 V dc Power Return (LO)
See LBP10.
LBP4 Spare Pin
LBP5 Fan 115 V ac Power Output (H)
This pin along with the Fan 115 V ac Output Power (C) line (pin LBP9) provides 115 V
ac power for an external fan.
LBP6 Spare Pin
LBP7 115 V ac Power Input (C)
See LBP1.
LBP8 Signal Ground
Connect to Aircraft Signal Ground.
LBP9 Fan 115 V ac Power Output (C)
See LBP5.