Underfire:
RNP-AR with a single GPS.?
As you know the missed approach segment is often not critical. The only clue the pilot has is when the chart states RNP of less than 1.0 is required for the missed approach.
Since Rifle, Colorado Runway 8 has been an example of low minimums but not a critical missed approach (other than climb performance) here is a more "terpsy" look at RNAV Z Runway 26. The missed approach is critical. By continuing past the FAF with one GPS receiver, the odds of having to conduct an IRU coasting missed approach are certainly increased significantly; probably reducing the target level of safety below the presumed value for this IAP.
I have pasted the missed approach "telescoping" values on the Jepp chart, followed by the actual FAA TERPS map. Not a friendly environment for coasting on IRU(s).
