Dual Transponders?

[Scott Aron Bloom]

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

[Venus]

I dont know either, but when I was at the avionics shop picking up my plane
recently, there was a pressureized C-210 they had just starteding working and
let me peek inside. It had dual garmin 330 x-ponders, garmin 430,530 and an
MX20, it also had some other nifty stuff like a flight navigator and so on.


Scott Aron Bloom wrote:

> 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

[Dave S]

Ive seen a couple of GA aircraft with em, and more than plenty of biz
jets that DONT.. I dont know the rhyme or reason. If I was limited on
panel space, Im sure a 2nd xponder would be low on the list.

Dave

Venus wrote:
> I dont know either, but when I was at the avionics shop picking up my plane
> recently, there was a pressureized C-210 they had just starteding working and
> let me peek inside. It had dual garmin 330 x-ponders, garmin 430,530 and an
> MX20, it also had some other nifty stuff like a flight navigator and so on.
>
>
> Scott Aron Bloom wrote:
>
>
>>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
>
>

[Dan Luke]

"Venus" wrote:
> it also had some other nifty stuff like a flight navigator

What's that?
--
Dan
C172RG at BFM

[Teacherjh]

How does a second transponder fit in to the datastream? Aren't they both
transmitting the same data at the same time on the same frequencies? Wont that
interefere with itself?

Jose

--
(for Email, make the obvious changes in my address)

[Steven P. McNicoll]

"Teacherjh" > wrote in message
...
>
> How does a second transponder fit in to the datastream? Aren't they both
> transmitting the same data at the same time on the same frequencies? Wont
that
> interefere with itself?
>

The second would only be used if ATC reported a problem with the first one.

[Casey Wilson]

"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
>
>

I dunno, but maybe for the same reason some people carry along handheld
radios, pocket GPS, extra batteries, 2 or 3 pencils, yadda, yadda...

[Brad Z]

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
>
>

[Steven P. McNicoll]

"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.
>

A faulty transponder COULD effectively ground the airplane. ATC can
authorize operations without a transponder, but there's no guarantee they
will.

[Scott Aron Bloom]

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
> >
> >
>
>

[JerryK]

I have dual transponders. Without a transponder you are restricted in the
altitudes you can fly and you have to make position reports. Both of these
restrictions can really be a major pain when flying high for any distance.

BTW, in case anyone is wondering, the transponders are wired such that only
one transponder is active at any one time. You set both transponders to
Mode C and your code into both. Another switch determines which transponder
is active. In my installation, the non-active transponder is is standby
mode.

jerry

"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
>
>

[Jeff]

So one is not really doing anything ..is it just left off untill the first
quits?


"Steven P. McNicoll" wrote:

> "Teacherjh" > wrote in message
> ...
> >
> > How does a second transponder fit in to the datastream? Aren't they both
> > transmitting the same data at the same time on the same frequencies? Wont
> that
> > interefere with itself?
> >
>
> The second would only be used if ATC reported a problem with the first one.

[Brad Z]

> A faulty transponder COULD effectively ground the airplane. ATC can
> authorize operations without a transponder, but there's no guarantee they
> will.
>
>

My bad, "unless otherwise authorized" (AIM 3-2-4 (d)(2)(b)) the plane is
effectively grounded. I suppose the offending transponder would need to be
placarded "inop" as well.

[Steven P. McNicoll]

"Jeff" > wrote in message
...
>
> So one is not really doing anything ..is it just left off untill the first
> quits?
>

Yup.

[Peter]

Why put it in the panel. I'm sure you could mount it between the seats.


"Venus" > wrote in message
...
> I dont know either, but when I was at the avionics shop picking up my
plane
> recently, there was a pressureized C-210 they had just starteding working
and
> let me peek inside. It had dual garmin 330 x-ponders, garmin 430,530 and
an
> MX20, it also had some other nifty stuff like a flight navigator and so
on.
>
>
> Scott Aron Bloom wrote:
>
> > 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
>

[Ditch]

>Why put it in the panel. I'm sure you could mount it between the seats.
>
>
>"Venus" > wrote in message
...
>> I dont know either, but when I was at the avionics shop picking up my
>plane
>> recently, there was a pressureized C-210 they had just starteding working
>and
>> let me peek inside. It had dual garmin 330 x-ponders, garmin 430,530 and
>an
>> MX20, it also had some other nifty stuff like a flight navigator and so
>on.
>>
>>
>> Scott Aron Bloom wrote:
>>
>> > 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
>>

The Twin Otter I flew had dual X-ponders. But we were using it for skydiving
ops and if the X-ponder goes down, we can't operate as a jump plane. SOOoo..we
had two....even had to use the 2nd one on occasion. Also, we had the panel
space to spare, so it was no biggie.




-John
*You are nothing until you have flown a Douglas, Lockheed, Grumman or North
American*

[Bill & Penny]

They make transponders that share one control panel. Some of our EMB-120's
have a dual transponder single control panel set up.

Bill
"

[John Roncallo]

I'm shure if you have dual Garmins the rest of your pannel space becomes
empty. Garmines pack a lot of boxes in one box.

John Roncallo

Peter wrote:
> Why put it in the panel. I'm sure you could mount it between the seats.
>
>
> "Venus" > wrote in message
> ...
>
>>I dont know either, but when I was at the avionics shop picking up my
>
> plane
>
>>recently, there was a pressureized C-210 they had just starteding working
>
> and
>
>>let me peek inside. It had dual garmin 330 x-ponders, garmin 430,530 and
>
> an
>
>>MX20, it also had some other nifty stuff like a flight navigator and so
>
> on.
>
>>
>>Scott Aron Bloom wrote:
>>
>>
>>>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
>>
>
>