I'm working on my CFI-I, trying to sort out the various information on WAAS approaches, cross-walking references published over the last five years that may not have kept up with the most current changes.
Are there "fail down" criteria for a WAAS Approach with Vertical Guidance?
I believe that if vertical guidance precision degrades on an LPV approach but LNAV/VNAV criteria are still met, the approach can be continued to DA.
However, I also think that if vertical guidance degrades on an APV approach to the point where there is no VNAV guidance, an immediate missed approach is required, even if the airplane is above LNAV MDA.
In other words, are there "fail down" criteria for VNAV that permit the approach to continue as an LNAV only approach?
My guess is that an LPV can "fail down" to LNAV/VNAV, but neither of these WAAS APV approaches can "fail down" to an LNAV approach even above MDA.
Is there an AIM or other authority that explains this? Thanks!
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