"BTIZ" wrote in message
news:fu%jb.49054$La.18760@fed1read02...
I have not seen one.. but I would think the battery drain would be
tremendous.. it's hard enough getting them into light twin engine
aircraft..

Not TCAS, TCAD. Like TPAS, it's passive, so there's no big power drain for
a transmitter . . some of the low end TPAS units run on AA cells,
independent of the airplane's power supply . . .
(These units depend on the target's transponder responding to some OTHER
radar interrogation . . ) That's what made me think SOMEONE om a g;oder out
there might be trying one of the TCAD units, which apparently has a little
better logic circuit in it that TPAS. . . .

Jim K