RNAV (RNP) Z approach

[skyhigh600]

Hey everyone, I am a little confused as to what the difference is between these RNAV "designator" approaches...

For example, what is the difference between the RNAV (GPS) Y RWY 8L @ ATL and the RNAV (RNP) Z RWY 8L @ ATL?

I have also seen these "designtor" appraoches for approach plates in other countries. For example, how would an ILS Y 25R @ Quito, Equcador (**made up approach - can't remember the exact approach or where it was that I saw it**) differ from a regular ILS approach??

Thanks in advance!!

[MidlifeFlyer]

They're explained in the AIM.

All the "Z" and "Y" designators mean is that there are two different approaches that use the same primary navigation source. There's nothing "special" about a "Z" approach other than that there is a "Y" one. And you don't have to make them up in foreign countries - there are ILS Z and ILS Y approaches in the US. (As I reacll Houston has some.)

The differences can be anything from IAFs and step-downs to minimums and missed approach holding fixes. To know what the difference is between any particular Z and Y combination, you'd have to look at the two charts.

[woodreau]

They also start from the backend of the alphabet, e.g. Z, Y, X, W so as not to confuse these approaches with the circling approaches like, VOR-DME A, B, C, D, E, F, G, H, etc...

[B767Driver]

Originally Posted by skyhigh600

Hey everyone, I am a little confused as to what the difference is between these RNAV "designator" approaches...

For example, what is the difference between the RNAV (GPS) Y RWY 8L @ ATL and the RNAV (RNP) Z RWY 8L @ ATL?

I have also seen these "designtor" appraoches for approach plates in other countries. For example, how would an ILS Y 25R @ Quito, Equcador (**made up approach - can't remember the exact approach or where it was that I saw it**) differ from a regular ILS approach??

Thanks in advance!!

The GPS approach is a bit different from the RNP approach. Most GPS approaches can also be flown as an overlay with ground based navaids. The RNP does not permit that flexibility...and must have certain equipment on board to ensure proper course tracking.