IO - I think you'll find that a Part M (G) is responsible for making sure that all previous work on the aircraft is valid. It's not good enough to say, "it came in like that"! This is why it's so important that log books reflect the official history of the aircraft by the way of minor/major mods etc. Keep up the thought provoking posts though. There's a world of difference between what we think we would like our universe to be and the real and legal reality. I'll vote for you next time
