Using LNAV for purposes of testing IPC Competency on an NDB approach
Hypothetical question. Take Melbourne Runway 16 NDB approach in an aircraft that has an FMS with the NDB approach in its data base. The aircraft does not have a GPS installed.
During the conduct of an IPC you are required to demonstrate competency at conducting the NDB approach.
The FMC NDB data base displays vertical guidance as well as lateral, allowing the pilot to theoretically choose to use LNAV/VNAV for the NDB approach. Plug in the automatic pilot and it is money for old rope as little flying skill is needed.
Because a computer generated glide path is available via VNAV, does this mean it becomes a 3D approach and not a 2D approach? Is that valid for the purpose of signing off the box for the NDB approach which is azimuth needle only?.
More to the principle of the flight test, is using LNAV or VNAV and LNAV together, a valid test of the pilot's competency to conduct an NDB approach?
Or should the approach for the purposes of an instrument rating test be a stand-alone exercise using the ADF needles only as azimuth guidance? Appreciate opinions preferably with documentary evidence. In other words, where can the correct answer be found in Part 61?