If the equipment is not in the aircraft, I do not test for it.
I did 6 instrument check-rides last week in a Garmin 1000 equipped aircraft with a very popular school, and I was very disappointed with every applicant in the knowledge and understanding of a RMI, VOR, HSI, CDI. (RMI can be displayed on a G1000 and you can track and intercept a radial as if it was an NDB pointer).
I have done many approaches with RMIs, NDBs back in my cargo days, and I understand that this type of flying is going away, but its hard for me and many examiners to see these skills diminish.
Here is what I typically see weak with Garmin 1000 applicants:
1. How a Localizer works. Will the CDI work the same regardless what I set on the OBS? How will it work? like a VOR or will it work the same regardless what OBS it is set to?
2. Reverse Sensing. Is there such a thing as Reverse sensing with an HSI using a VOR? (4 applicants said "yes if it is set wrong", the other 2 applicants responded with "yes there is reverse sensing with an HSI, however the Garmin 1000 is smart enough to recognize it and correct it".
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3. Reverse Sensing with a LOC and an HSI. Can it happen? What about a Back-course? (NOTE, IF the gray/shaded side of the localizer is NOT on the right side of the CDI, you will get reverse sensing regardless if it is a back-course or normal course).
4. How to use OBS mode, and why or when would you use it.
Note, all 6 applicants did pass their checkrides. But I spent quite a bit of time debriefing them. Per the ACS, an applicant is unsat when they meet any of the five criteria:
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It does no good to do "Gotcha, you need to re-test", questions. Especially with equipment that is not in the aircraft. I have had many stories about "my checkrides" that were not even remotely close to the reason I unsat them, so I take these stories with a grain of salt although I'm sure they happen. There has been a big push by the FAA for better standardization with DPEs recently, so hopefully student experiences start to improve.