As far as I understand, there are mainly 3 types of RNP approaches:

  • LNAV/VNAV - we have a set of fixes with altitudes and flying it
  • LPV WAAS/EGNOS - same as 1, but aircraft use special receiver equipment based on geostationary satellites, that's why it's so-called SBAS (sattelite-based)
  • LPV GLS - which is same as ILS, uses GPS + signals from ground equipment. It's so-called GBAS (ground-based)

Let's take EPRZ RNP Rwy 09. enter image description here Here we can see three options:

  1. LPV CAT 1 - which I assume shall use EGNOS (V in LPV is vertical)
  2. LNAV/VNAV - which I assume use only FIXes and altitudes
  3. LNAV CDFA - which I assume uses LNAV and I need to descend somehow (V/S or glide path angle)

In terms of 737 NG, LNAV/VNAV and CDFA are straightforward.

  1. Do I need to "tune" WAAS/EGNOS channel somehow? Referring to this LPV/LP approach (RNAV with WAAS): What is actually the "channel number"? it seems like no
  2. If I don't need to tune EGNOS channel, what is the difference between LNAV/VNAV and LPV WAAS/EGNOS regarding the procedures? How do I know, if aircraft is ready for LPV with EGNOS/WAAS?
  3. Approach is called LPV CAT 1, on the other hand, in EPGD RNP approach named just LPV. What is the CAT 1 here?
  4. Can IAN be used (if equipped) instead of LPV, LNAV/VNAV and LNAV CDFA?
  5. I assume something here is related to ANP/RNP, but chart has no RNP minimum values listed here. What are the general rules, I probably missed?

FCOM 737 says only about ILS/GLS (normal procedure) and supplementary SP 4.7 Instrument Approach - RNAV (RNP) AR, but in such case it's non-AR approach.

I'm not 737 pilot yet, using 737 in simulators only



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