337 to install a transponder?

I just purchased a Garmin GTX-327 off of Ebay (installed for one day, before
the owner decided he REALLY wanted the Mode S GTX-330!), and am lining up
installation. I was surprised to hear that a 337 form had to be filed for
this installation.

It's not a big deal for the avionics shop to do, but wouldn't you think
Garmin would have STC'd this unit for the Cherokee line?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Jay Honeck wrote:
I just purchased a Garmin GTX-327 off of Ebay (installed for one day, before
the owner decided he REALLY wanted the Mode S GTX-330!), and am lining up
installation. I was surprised to hear that a 337 form had to be filed for
this installation.
It's not a big deal for the avionics shop to do, but wouldn't you think
Garmin would have STC'd this unit for the Cherokee line?

Having an STC isn't really the issue. It's whether a particular shop (or
a particular FSDO) considers the installation a "major alteration" or a
minor one. There a probably shops that would swap two similar
transponders with just a logbook entry, but most would probably do a 337
just to cover themselves. Heck, my buddy's avionics shop does a 337 for
practically anything it does.

-- Jay


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Jay Honeck wrote:
I just purchased a Garmin GTX-327 off of Ebay (installed for one day, before
the owner decided he REALLY wanted the Mode S GTX-330!), and am lining up
installation. I was surprised to hear that a 337 form had to be filed for
this installation.

It's not a big deal for the avionics shop to do, but wouldn't you think
Garmin would have STC'd this unit for the Cherokee line?

Even if there is an STC for the cherokees you would still need to file a
337. If there isn't an STC, if installing a transponder is considered a
major alteration, then you would need a field approval. So you send the
337 to the FSDO for approval before installation, when the approval
comes back you install the transponder. After installation and IA
signoff you send the 337 back to the FSDO. They then forward it down to
OKC for it to go into the permanent records of your aircraft.

So you send the
337 to the FSDO for approval before installation, when the approval
comes back you install the transponder.

The seller is shipping the unit today, but (of course) we're coming up on
Xmas and New Years, and the avionics shop is in Illinois, so it'll probably
be at least a week before I could get the installation done anyway.

How long does getting the 337 usually take?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

In article YnsEb.395597$Dw6.1246219@attbi_s02, "Jay Honeck"
wrote:

So you send the
337 to the FSDO for approval before installation, when the approval
comes back you install the transponder.

The seller is shipping the unit today, but (of course) we're coming up on
Xmas and New Years, and the avionics shop is in Illinois, so it'll
probably
be at least a week before I could get the installation done anyway.

How long does getting the 337 usually take?


While overhauling my engine I did a set of six 337s by talking
to the FSDO guy in advance and then brought the 337s over to
the office prior to the post-engine install test flight. In
other words, it didn't take any time.

--
Bob Noel

how much did you pay for it on ebay ?

I had bid ona few of them awhile back but when they got close to the price of a
new one I stopped. I finally had mine installed with the rest of my avionics at
one time.


Jay Honeck wrote:

So you send the
337 to the FSDO for approval before installation, when the approval
comes back you install the transponder.

The seller is shipping the unit today, but (of course) we're coming up on
Xmas and New Years, and the avionics shop is in Illinois, so it'll probably
be at least a week before I could get the installation done anyway.

How long does getting the 337 usually take?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

how much did you pay for it on ebay ?

$1325.00. New ones are going for $1895, installed (but, of course, I'd
have to fly to Pacific Coast Avionics to have it done for that price!). My
shop quoted me $200 - $300 for installation, so I figure I saved a couple of
hundred bucks.

It comes with the tray, connectors, manuals, and a warranty, because it was
literally in a plane only one day.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Aircraft spruce
part number: 11-00329 GARMIN GTX-327 W HARNESS $1434.000

I am not sure what I paid for mine installed, I know he had to test it and the
transponder check was part of the install.

Jay Honeck wrote:

how much did you pay for it on ebay ?

$1325.00. New ones are going for $1895, installed (but, of course, I'd
have to fly to Pacific Coast Avionics to have it done for that price!). My
shop quoted me $200 - $300 for installation, so I figure I saved a couple of
hundred bucks.

It comes with the tray, connectors, manuals, and a warranty, because it was
literally in a plane only one day.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

My kt-76 went belly up last month, so my avionics shop installed a used
GTX-27 in my Skylane. They charged me around $1300 for the used transponder
(it was in perfect condition, used only 1 year & removed for an upgrade).
And around $400 for installation. I got out of there for around $1800.

No 337 form, just a logbook entry.

I must confess, the pushbutton transponder code entry is quite nice. Not to
mention the mode C alt display.

Guy Byars


"Jay Honeck" wrote in message
news:fFDEb.602919$Fm2.546931@attbi_s04...
how much did you pay for it on ebay ?

$1325.00. New ones are going for $1895, installed (but, of course, I'd
have to fly to Pacific Coast Avionics to have it done for that price!).
My
shop quoted me $200 - $300 for installation, so I figure I saved a couple
of
hundred bucks.

It comes with the tray, connectors, manuals, and a warranty, because it
was
literally in a plane only one day.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

"Jay Honeck" wrote
I just purchased a Garmin GTX-327 off of Ebay (installed for one day, before
the owner decided he REALLY wanted the Mode S GTX-330!), and am lining up
installation. I was surprised to hear that a 337 form had to be filed for
this installation.

It's not a big deal for the avionics shop to do, but wouldn't you think
Garmin would have STC'd this unit for the Cherokee line?

It's not likely that the unit is STC's for the Cherokee line, but you
can check easily enough. www.airweb.faa.gov/stc

By definition, if an STC is required, then the alteration is major.
That means a Form 337 is required. The STC also constitutes approved
data.

If no approved data are available, you also need a field approval
(which is almost impossible to get these days).

In general, avionics are installed on a Form 337. This should not be
necessary. There is FAA guidance that explicitly states that the
installation of a single radio in a non-pressurized airplane is a
minor alteration, but many (most) FSDO's feel otherwise. So without
an STC, what kind of data do we use? Well, mostly we wing it.

The avionics are TSO'd, and that means the installation manual is
TSO'd as well. A TSO'd manual is approved data. So we cite the
installation manual and the relevant (sometimes barely relevant) parts
of AC 43.13 as the data, and call it good. Most FSDO's seem to be
happy to accept this. Is it really legal? Probably not, but it works
so we don't make too many noises about it.

What your shop is doing is normal practice. Leave it be.

Michael