February 2, 20188 yr So I'm flying an approach into EWR on the UAL737 from YYZ and I was cleared the 22L RNAV RNP (z) 29. Anyways its got mins for both 0.16 RNP and 0.30 RNP, which one would the NGX be "legal" to fly? Cheers! Ron Hamilton "95% is half the truth, but most of it is lies, but if you read half of what is written, you'll be okay." __ Honey Boo Boo's Mom
February 3, 20188 yr It depends on the operations specifications for whoever operates the airplane. In our case we can go as low as 0.11 RNP but to do so dispatch has to give you a RAIM prediction for your time of arrival. 0.30 and above has no such restriction so we could use those minimums if we didn't have the prediction.
February 3, 20188 yr Author 52 minutes ago, JoeDiamond said: It depends on the operations specifications for whoever operates the airplane. In our case we can go as low as 0.11 RNP but to do so dispatch has to give you a RAIM prediction for your time of arrival. 0.30 and above has no such restriction so we could use those minimums if we didn't have the prediction. O ok, That is interesting I didn't know that. I assumed it had something to do with the airplane not being able to fly a radius to a fix because the math wasn't in the navdata provided by Navigraph. Ron Hamilton "95% is half the truth, but most of it is lies, but if you read half of what is written, you'll be okay." __ Honey Boo Boo's Mom
February 3, 20188 yr The NGX will only go as low as 0.30 RNP due to its age. Also, as you mentioned, the navdata is not in a format that can provide RF arcs so any arc you happen to find is going to be constructed of pseudo waypoints to create a resemblance of an arc. None of the arcs for the RNP approaches for my home base even provide those, all I get is the waypoint before the arc and the waypoint at the end of the arc. This is just one of those downsides to using an obsolete navdata format. Dan Downs KCRP
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