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GPS Question
"kgruber" wrote in message ... Except for flying an approach at the alternate: Ref: AIM 1-1-19, paragraph f.1.(b)(8) Restrictions "For TSO-C129/129A users, any required alternate airport must still have an approved instrument approach procedure other than GPS that is anticipated to be operational and available at the estimated time of arrival, and which the aircraft is equipped to fly. If the non-GPS approaches on which the pilot must rely require DME or ADF, the aircraft must be equipped with DME or ADF avionics as appropriate." Not so. One can still fly a GPS approach at the alternate. You just need the other equipment installed. If you have approved WAAS avionics, you may plan to use any instrument approach authorized for use with WAAS avionics at a required alternate. Karl "Curator" N185KG "Not so" on which point? The AIM clearly states that the FILED alternate must "still have an approved instrument approach procedure other than GPS..." That's word for word out of the book. But it doesn't SAY you can't FLY a GPS approach at said alternate, so I agree that you can fly a GPS approach at your filed alternate. It just can't be the ONLY approach available at that alternate. There are several airports around that have only a GPS approach or only approaches (such as an ILS or VOR) that require DME or NDB for position fixing and/or executing the missed. These airports are, therefore, not LEGAL alternates for the purpose of filing an alternate. The motivation here is to have an executable Plan B in case of RAIM failure or GPS interference or jamming. If GPS keeps humming, no harm, no foul but if it lets you down for any reason, you'll need the *real* DME or ADF installed to navigate the approach and that's the point of the AIM reference. I also agree with your second point about WAAS equipment but your point is outside the scope of the AIM paragraph in that it addresses TSO-C129/129A installations, not TSO-145A which applies to WAAS augmentation of GPS. Therefore, if your new Cirrus doesn't have bona fide NDB, DME, or WAAS, your FILED alternate would need to have an available approach without the requirement for any of those. That being said, what you file and what you fly will likely be based on why you miss the primary approach in the first place. |
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