Originally Posted by
pilotnik86
Thank You. I guess that must suffice. Still I can't understand how some EU airlines operating on B737 tell their pilots that they can perform RNP approach (LNAV & LNAV/VNAV) even during RAIM unavailability. This is the key reason why I asked this question.
Sure it is. RAIM is one of two types of ABAS. The other one is AAIM. You can get more details from Annex 10, DOC 9613 and 965/2012 Part-SPA. What the M stands for is completely irrelevant.
Whats your point? Since the 737 in incapable of RAIM prediction itself the operator must at least use some kind of external RAIM prediction service, such as AUGUR, to dispatch aircraft in conditions that would require a certain RNP approach or procedure. If in flight RAIM causes the ANP to shoot up above RNP for the procedure, either because of signal unavailability or other reasons, you obviously can't shoot the approach...