I logged 40 hours PIC in a Russian-built Antonov AN-2 two years ago and I got asked about systems on that in one of my interviews. I think that it was more out of curiosity, but they still asked. The problem was that in 1951 POHs didn't really exist and the little bit that did was in Russian as were the gauges. (Quick what altitude are you at if the alti says 1800 meters?) We flew thae plane on the "whatever worked" method, which was still good enough to take 10 people out of an 1800 foot strip! I knew enough to talk my way out of it, but it was a good thing that they didn't dig any deeper....