B-rnav/p-rnav/rnp 0.3

[Ludolf]

Hello.

Just a quick question...

Let's say we have two different types of A/C's. One type is approved for B-RNAV, P-RNAV and RNP 0.3 and the other type is approved for P-RNAV and RNP 0.3 only.
How is it possible to have an approval for P-RNAV and RNP 0.3 and not for B-RNAV?. One would think that an A/C being capable of flying P-RNAV should also be able to fly a less stringent nav. specification.

Could somebody shed some light over this?

[B737900er]

To fly in EU airspace above FL95 you have to be B-RNAV approved. Some countries the airspace is higher.

[Ludolf]

But what still puzzles me is that you can have an aircraft which is certified for p-rnav with a higher accuracy which is not allowed to fly in an airspace where the requirements for accuracy are less stringent.

What am I missing here? I can't seem to find any logic behind this.

[B737900er]

I would say its because its a money maker.

[Ludolf]

I guess you're right.
Aviation doesn't always make sense.