RNP .16 .30

[fakeflyer737 992]

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!

[JoeDiamond 67]

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.

[fakeflyer737 992]

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.

[downscc 1,327]

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.