So you fly the KEA transition like this:
Track RDL 265 KEA until crossing RDL 187 ATV or 27 DME KEA
Start a right turn and intercept RDL 192 ATV
Fly RDL192 until intercepting final
As egid said, RDL 187 ATV is a lead radial which is a radial used only to tell you when to start a turn.
As far as 20 DME ATV, it is actually only used for the PELAG transition ...
No. The FMS does not use rhumb lines.
All RNP/RNAV flight path legs are geodesics. The only exceptions are RF legs (a constant radius circular path about a turn center) and hold legs (a closed racetrack pattern).
To quote RTCA DO-236C, Minimum Aviation System Performance Standards: Required Navigation Performance for Area Navigation:
RNP Routes and ...
The PBN manual is the place to start. In Section 5 on departure procedures it includes the following reference:
b. Leg type limitations. See Order 8260.46, paragraph 3-1-5 for
permissible leg types.
Also, all the TERPS requirements also apply, except where modified by the PBN manual.
There's usually no one rule that applies universally. It's about ...
It's in the Altitude/Minimum Altitude data field:
5.30 Altitude/Minimum Altitude
Definition/Description: The Altitude/Minimum Altitude field indicates
the reference altitude associated with (1) Enroute Airways (MEA, MFA
or other minimum altitudes as defined by source), (2) holding pattern
path of Holding Pattern record, (3) altitudes at fixes ...
As the name suggests, MEA is coded for enroute segments lik ethe airways (ARINC permits this). In so far as Instrument Approaches are concerned, the templates takes into account vertical clearances in Primary and secondary areas and then arrives at safe heights at each segment. Geometry of primary and secondary areas and the clearance therein depends on ...