Actually they are not "GPS" approaches though GPS is a requirement for them. They are RNAV(RNP) approaches that require a SAAAR (Special Aircraft and Aircrew Requirement) or if its an ICAO approach an AR
Thing is that some planes can meet the low RNP requirements (Smith/GE FMCs and Pegasus (Honeywell) FMCs) yet not a lot of airlines are investing in this. IMO in a few years more and more airlines will be investing in this but it will only be airlines. GA
will just stick to WAAS
GPS approaches. AFAIK, there was only one (RNP) approved GA
jet and it was sorta by default as it was (still is?) the Gulfstream V Honeywell FMS test plane.
I'm personally surprised that NACO
/FAA actually publish these approaches and have them open to the general public and actually two (RNP) approaches that CO
developed for 29 at EWR
where just published by NACO
as well. IMHO, its just a waste (even though I don't use NACO
charts) since NO ONE is RNP approach approved and the people who are use higher quality products like Jeppesen or just have Jeppesen produce company charts.
So the long to short is..... if your airport would even get an (RNP) approach, you would not be able to fly it unless your company (if that is your case) supped up the plane(s) and made them comply w/ AC
90-101 which would more then likely not be cost effective since the number of RNP approaches you would actually do would be close to 0. Heck most airlines that (RNP) approach approved, besides AS
, Air China, and QF
only fly the approaches in the sim every 6 or so months.
In conclusion, its going to take many more years of the HAR
to actually see these approaches common place in the states. Australia on the other hand has really embraced these approaches though, so who knows. I got a feeling if the WN
(RNP) conversion is a success after 2012, or whenever, more airlines might look at this stuff with more of an open mind.
If you want to see some approaches look at: (RF= Radius-to Fix)
Don't get me wrong, I really dig PBN (performance based navigation) stuff like this but unfortunately I'm also a realist
[Edited 2009-04-08 14:33:35]