highflight1(at)gmail.com
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 Posted: Sun Jun 11, 2006 4:39 am Post subject: Experimental IFR w/o a certified GPS or looking for a copy o |
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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 (deemsdavis(at)cox.net)> wrote: | Quote: | --> AeroElectric-List message posted by: Deems Davis <deemsdavis(at)cox.net (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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