RNP SID with RF leg

[aterpster]

9.G:

I find it however highly improbable that all the other reputable organisations like Airbus, Jeppesen and last but not least wikipedia Required navigation performance - Wikipedia, the free encyclopedia concept description all got it wrong.

Wikipedia did get one item wrong, or at least incomplete, and I quote:

When conducting an RNP SAAAR approach with a missed approach less than RNP 1.0, no single-point-of-failure can cause the loss of guidance compliant with the RNP value associated with a missed approach procedure. Typically, the aircraft must have at least dual GNSS sensors, dual flight management systems, dual air data systems, dual autopilots, and a single inertial reference unit.

At least one IRU is also required when any part of the approach phase requires RNP of less than 0.30, even though the missed approach may not require RNP of less than 1.0.

From a pilot perspective RNP AR is easy, as are operational concepts and actual flying of the procedures.

What is not easy are the hoops the airframe OEM has to jump through to qualify the aircraft, what the operator of an RNP AR aircraft has to do to validate the database and its performance in any qualified airframe's FMSes, and the design and flight inspection requirements.

There are so many different FMSes out there with so many variables in software, it is mandatory that the additional database and performance validation steps must be taken to assure performance on the often far less forgiving RNP AR approach procedures.