Today's Message Index:
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1. 03:09 AM - OEM or home-made ELT antennas? (Glen Matejcek)
2. 09:45 AM - Re: Fw: OEM or home-made ELT antennas? (Robert L. Nuckolls, III)
Message 1
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| Subject: | OEM or home-made ELT antennas? |
Hmmm....
I smell a rat.
With all due respect to having to live with the local sherriff, my understanding
is that the ONLY thing required to actually be TSO'd on an experimental is a
GPS planned for use in termminal operations. Other things needed to be TSO compliant,
but that is different from wearing a sticker.
Thoughts, Bob?
>Time: 04:41:31 PM PST US
>Subject: Re: AeroElectric-List: Fw: OEM or home-made ELT antennas?
>From: Richard Girard <aslsa.rng@gmail.com>
>
>Mike, I had this conversation with the local FSDO about two months ago. The
>antenna is part of the TSO for the ELT. Even on an experimental it's not
>legal to put on anything but the manufacturers antenna. Sorry to be the
>bearer of bad news.
>
>Rick Girard
>
>On Sat, Oct 6, 2012 at 1:51 PM, Mike Wynn <wynaire@citlink.net> wrote:
>
>> **
>> Hello Bob, et al:
>> I found and purchased a NOS "ACK ELT", w/o a fixed [fuselage] antenna. I
>> plan to install in the Lancair [composite beast].
>> Your opinion please on whether to go dirt cheap and build an antenna to
>> install, or buy the OEM [ACK] version?
>> Ques. #2: Is it always best to use the ELT's manufacturers antenna design,
>> rather than someone elses, that looks comparable/compatible? I have a
>> Garrett ELT antenna & base {p/n 615363-1} with a couple of tuner-coils (?)
>> imbeded in epoxy in the base.... Haven't found any info on the net.
>> Thanks in advance,
>> Mike W.
>> Moab, UT
Glen Matejcek
Message 2
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| Subject: | Re: Fw: OEM or home-made ELT antennas? |
At 01:51 PM 10/6/2012, you wrote:
>Hello Bob, et al:
>I found and purchased a NOS "ACK ELT", w/o a fixed [fuselage]
>antenna. I plan to install in the Lancair [composite beast].
>Your opinion please on whether to go dirt cheap and build an antenna
>to install, or buy the OEM [ACK] version?
>Ques. #2: Is it always best to use the ELT's manufacturers antenna
>design, rather than someone elses, that looks
>comparable/compatible? I have a Garrett ELT antenna & base {p/n
>615363-1} with a couple of tuner-coils (?) imbeded in epoxy in the
>base.... Haven't found any info on the net.
>Thanks in advance,
>Mike W.
>Moab, UT
From a purely technical perspective:
If this were a legacy 121.5 "hope it will work"
type ELT, then any VHF comm antenna would perform as well
as the 'stock 'antenna supplied with the ELT.
The modern two-frequency ELTs require either two
separate antennas (like those on the Beechjet)
Emacs!
Or a muti-band antenna tailored to the task. It's likely that
ANY 121.5/406 antenna would work just fine but given
the relative level of understanding by any individual likely
to take regulatory notice, likelihood of getting a
substitution approved is very low.
They are skilled in the reading of labels and checking
of boxes on forms, not skilled judging the suitability
of any substitution to a task.
From the regulatory perspective:
Irrespective of the technical validity of any substitute
you might find, the risk for having it become some
kind of . . . uh . . . bump in the road is not zero.
The term TSO appears 52 times in the latest version of
Part 91 just downloaded. It speaks to all manner of
panel mounted electro-whizzies including ELTs. TSO's
are becoming a kind of executive order that exerts
a force "for our own good." Resistance is futile, we
will be assimilated.
Bob . . .
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