Deems Davis
Joined: 09 Jan 2006
Posts: 925
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 Posted: Sun Jun 11, 2006 10:53 am Post subject: Experimental IFR w/o a certified GPS or looking for a copy |
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I am certainly No expert, but I'm inquizitive and like to learn, and
while the article may have some issues, the folks (at) Direct2 thought
enough of it to put it on their website. The gist of Experimental
aircraft is that we CAN investigate LEGAL alternatives, The EFIS that
I'm buying is not Certified, But I'm certain that it can/will provide
all of the pilot information that is required, and for less $'s than a
certified unit. There is indeed a very large and growing market of
avionics based upon this notion for which the EAA has already weighed in on.
I was under the impression that WAAS has it's own fault detection
capabilities and therefore RAIM is not an issue (Set me straight if I'm
off base) . If WAAS GPS receivers can receive this fault info, (I'm sure
there are differences in the GPS receivers) then in theory it should be
a straight forward thing for it to be passed/picked up by an EFIS and
the appropriate indication provided to the pilot, perhaps this is what
Grand Rapids is pursing?
TSO-C146 - while it IS the standard document, does NOT specify the
functional requirements, That's why I was looking for a copy of
RTCA/DO-229C to better understand the Functional requirements, so I
could make a personal individual builder/pilot assessment of whether
this is worth pursuing. (Certification, goes WAY beyond functional
requirements, and involves, environmenl, packaging, labeling, and
numerous other documents and requirements). It may turn out that,
individual pilot/builder 'certification' is indeed an onerous task, but
let's not short circuit the discovery and learning.
Deems Davis # 406
Fuse
http://deemsrv10.com/
Vern W. wrote:
| Quote: | WAAS is not the important part of the TSO. Some TSO's GPS units are
not WAAS capable.
What IS the deal breaker for a GPS meeting TSO standards is RAIM.
Sure, you have to look at all the requirements, but if a GPS is not
RAIM capable, then you're never going to meet the TSO. If your GPS is
RAIM enabled, you at least have a shot at it if you want to test the
rest of it's capabilities yourself and compare it to the rest of the
TSO standards.
Note that Grand Rapids just came out with an option for a RAIM enabled
GPS for their EFIS system which is pretty exciting in that you "might"
be able to put it through all the TSO paces and perhaps be able to
self-certify it for legal IFR GPS by documenting if it meets all the
specs.
But being RAIM enabled, at least it's worth the effort of giving it a
try for IFR legality.
Vern W.
On 6/11/06, *Deems Davis* <deemsdavis(at)cox.net
<mailto:deemsdavis(at)cox.net>> wrote:
<deemsdavis(at)cox.net <mailto:deemsdavis(at)cox.net>>
I recently read an article posted on Direct2. website
http://www.direct2avionics.com/pdfs/Using_GPS_for_IFR_flight.pd by a
Phd CFII that concludes that for EXPERIMENTAL aircraft, it was not
necessary for the aircraft to be equipped with a CERTIFIED GPS
receiver
to legally file and fly IFR, PROVIDED that you, the pilot/mfg can
evaluate the GPS functionality, and find it provides all of the
necessary pilot input (as defined in the TSO) for IFR flight.
This sounded like it was worth looking into. I verified this opinion
with a competitor of Direct2. So off I go to study TSO-C146 the
Standard
document for WAAS GPS, unfortunately there is nothing in the document
regarding functional requirements other than a reference to:
RTCA/DO-229B (which I learned has since been superceeded w/
RTCA/DO-229C). Another Google search reveals that this document is
available but with a cost which ranged from $108-370 per copy.
Does anyone know of a 'library' where this document could be
'rented' or
checked-out. a couple hundred bucks is a steep price for someone just
investigating an idea/thought.
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