to answer eyeinthesky's question...the legislation is referred to in yellow AIC 148/1997 (280)
On that point, there is no FPL item 10 letter for RNAV. If as is suggested, non-carriage would cause the FPL to be refused, what is one supposed to enter in item 10? R for RNP compliant??
Over to Bookworm I suspect!
Tori