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N1DeltaWhiskey(at)comcast
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 Posted: Mon Aug 14, 2006 4:39 pm Post subject: encoder approval |
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OC,
If I interpret these comments correctly, you are saying I could go buy an
Experimental category aircraft and do anything I want on it with the
exception of signing off the annual inspection?
That changes my previous perceptions, but I like it. I was under the
impression that the purchaser of an Experimental was in the same boat as a
Certified owner when it came to changing the A/C.
Doug Windhorn
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Bruce(at)glasair.org
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| Posted: Mon Aug 14, 2006 7:11 pm Post subject: encoder approval |
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Your perception is correct. Anyone can work on an experimental and do
anything they desire with 2 exceptions. One - the 24 month
transponder/encoder/altimeter certification. This must be done by a licensed
shop. Two - the annual condition inspection. This must be done by an A/P (no
IA required), or by the licensing builder/repairman.
Bruce
www.glasair.org
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nuckollsr(at)cox.net
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| Posted: Tue Aug 15, 2006 4:44 am Post subject: encoder approval |
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At 07:14 PM 8/14/2006 -0500, you wrote:
| Quote: |
<cfi(at)conwaycorp.net>
OC, thanks for your objective response to my message. I appreciate
healthy debate in that it improves my understanding of the issues, in this
case FAR 91.217. I now see what you are saying. Everything else aside,
91.217 (c) does not say the equipment must be TSO certified, but meet the
TSO standards. My question to the non-TSO'd encoder community is this:
How do you prove your equipment meets the required TSO standards? TSO
certification is not in the reg, but MEETING it is.
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. . . and here's where you get the mud stirred up. Folks who
write regulations are never the folks who have to enforce and/or
comply with them. Further, authors are seldom cognizant of how
many ways their words may be interpreted.
I've always operated under the common sense rule. What is the
purpose of this particular regulation? (1) To make sure the guy on
the ATC 'scope is seeing the same numbers you're seeing on your
altimeter and (2) both numbers are reasonably accurate.
The TSO will call out many tests (DO-160 environment, etc)
along with some accuracy requirements. The fact that the
device's label carries a TSO compliance citation says
absolutely NOTHING about your encoder's PRESENT ability to
meet the goals (1) and (2) above.
All the testing, ISO9000, quality assurance tests, inspections,
and citations for NOT having a TSO citation on the sticker
go SERVICE LIFE and says very little about the question:
"Is my encoder working as it should RIGHT NOW?"
Since your personal goals are right in line with the guy
at the 'scope . . . then setting up some protocol for
selection, monitoring and maintenance of your encoder is
the best way to meet those goals. A bureaucrat can only
whack you for a perceived misbehavior. He'd like to believe
that his actions under whatever authority he possesses goes
toward (1) and (2) . . . well . . . 'nuf said.
Bottom line is install whatever encoder rings your chimes
and work with your favorite test equipment operator to
periodically verify performance. Even better, develop
access to your OWN testing abilities with something like
the AirSport display, a hand vacuum pump and a water
manometer. It's simple physics.
Bob . . .
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Sat Aug 19, 2006 6:58 pm Post subject: encoder approval |
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On Aug 15, 2006, at 6:43 AM, Robert L. Nuckolls, III wrote:
| Quote: | Since your personal goals are right in line with the guy
at the 'scope . . . then setting up some protocol for
selection, monitoring and maintenance of your encoder is
the best way to meet those goals. A bureaucrat can only
whack you for a perceived misbehavior. He'd like to believe
that his actions under whatever authority he possesses goes
toward (1) and (2) . . . well . . . 'nuf said.
Bottom line is install whatever encoder rings your chimes
and work with your favorite test equipment operator to
periodically verify performance. Even better, develop
access to your OWN testing abilities with something like
the AirSport display, a hand vacuum pump and a water
manometer. It's simple physics.
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Oh, how right-on-the-money. But it is even easier than that. Many
transponders will now display the pressure altitude from the encoder.
All you need to do is to dial up 29.92 "Hg or 1013.2 mB in the
Kollsman window and see if the display on the transponder is within
specified limits (150') of the display on the altimeter. You can do
this once on every flight and assure yourself that your encoder and
altimeter are telling you the same thing. If they differ by more than
150' then you know you need to check things out.
I have been away from email for most of the week (flying from FL to
CA via TX and ID) collecting various family members and delivering
them to the necessary places in the country on my way back from the
Caribbean in my Aztruck (Piper PA-27 Aztec to the uninitiated). I am
looking forward to wading back into the fray.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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