I am not ATC, but I think the show stopper problem IS certification.
Consider for example, what happens if an RPT twin goes into Narromine,
or Gawler say ? Even if FLAMS or anything else could exchange data with
an ATC ground station for feeding into TAAATS, and thence back out to
the twin as an ADSB update, the simple fact is (as I see it) that
LEGALLY, ASA could not take the risk that it might be corrupt data.
They have to maintain both system and data integrity. That is what
certification is all about in the first place. You can't walk away from
the certification issue if you want anything to do with ATC, either
feeding them data, or getting their data. Further, once ICAO mandates
ADSB, I can't see any other system being LEGALLY acceptable for
integration with ATC.
Whatever other systems may be used by gliders amongst themselves outside
controlled airspace is "probably" open to choice, legally, but I think
the ATC world could only consider any such position reporting (if they
even take a feed at all) simply as supplementary data, no more valid
than a good old style radio position report, WITH, the VFR navigation
margins applied, ie, 2 miles below 5,000 etc, so you can forget about
any supposed GPS based precision reporting, even in 2 dimensions, let
alone 3D, DGPS notwithstanding. That would mean ATC could still advise
the IFR twin of the glider(s) simply as alerted VFR traffic, nothing
more. Moreover, gliders, being uncontrolled VFR, would not be advised
of the twin. In short, there would be no efective change from what
exists today, so far as ATC is concerned, so far as I can see.
--
Peter Creswick
E-mail [EMAIL PROTECTED]
Land Line 02 9718 4841
Mobile/SMS 0401 758 025
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