..thanks for the explanations!
Last question: on the A320 FCOM - Special Ops chapter, there's a list of requirements for PRNAV and another set of requirements for RNP AR. By Icao Doc 9905, definition of RNP AR is "a RNAV approach where RNP is below 0.3 and down to 0.1".
I understand I can fly a conventional RNAV NPA with RNP 0.3 with the same airborne equipment required for PRNAV but the relevant RNP will be 0.3 instead of 1.0.
FCOM requirements for RNP AR are applicable only for RNAV approaches with a RNP below 0.3 which call for a special authorization from the Authority in charge of the relevant airport besides the normal RNAV approach authorization from the Operator's CAA.
Have i got it right?
Thanks!
You should be extremely cautious following an 'RNP procedure' using pRNAV in theory the accuracy of navigation is the same - however, RNAV (including pRNAV) does not provide for any alerts on reduction of ANP to the extent that the aircraft will no longer remain within safe containment (normally twice the RNP).