I have SFH around 8 different R22's in the last three years. I guess I have put a quart in around 1 in every 6 fights.
Quote FH1100 "just bring the oil up to the proper level for your flight and make a note in the maintenance log of the amount added. Have a calm word with the head guy of the outfit and move on."............. I apologise for being insulting, but that has got to be the worst armchair advice I have heard in a long time.
I am not saying this aircraft is unairworthy (I don't know enough of the facts), but by the same token you simply cannot say "The aircraft is very likely not an unairworthy timebomb".
It was 3 quarts below minimum, not recommended, not maximum – surely these circumstances deserve investigation before flying ?
There may well be a simple less worrying explanation but on a balance of probability either it is using oil at an abnormally high rate or there has been a systematic failure to maintain (18 – 24 hours of use without topping up ?). IMHO - either way, filling it up, having a calm word and going off flying is like putting in a request to be an air accident statistic.