This makes sense, but I was just looking on ASO at some senecas and about
10-15% had
dual xponders. But I was also seeing them on bonanzas and others....

Scott


"Brad Z" wrote in message
news:MJKzb.301460$9E1.1527176@attbi_s52...
I noticed that ATP Inc. uses two transponders in their Seminole trainers.
My understanding is that because many of the ATP locations only have one
plane, no maintenance shop, and operate out of class C airports, a faulty
transponder would effectively ground the airplane, making a "Four day"
multi
course a four week course.


"Scott Aron Bloom" wrote in message
...
Ok, Im not talking about the commercial carriers. But why would a
general
aviation plane have dual transponders? Why waste the panel space? So
they
go
tits up that often in flight where its necessary?

Scott