In article ,
"Steven P. McNicoll" wrote:

No person may operate a civil aircraft under IFR using an Area Navigation
System unless the equipment of that aircraft meets the requirements of
TSO-C60b, TSO-C115b, or TSO-C129A and is installed in accordance with AC
20-121, AC 20-130, or AC 20-138.

wait for RNP.

And how many AC's are referenced in the FARs?

--
Bob Noel
Looking for a sig the
lawyers will hate