Thanks A & C. That's exactly the sort of thing I will be looking at, but because the 172 is so simple there don't seem to be many economies to be made. I am up to speed on all the ADs that affect it (and there's an SB from Lycoming), but there are probably some component parts that I need to understand requirements for.........
Example - hoses need pressure testing every 36 months "until ultimate service life, if stated, is achieved". How do I check if "ultimate service life" exists? (Existing hoses were supplied with factory-new O-360A4M direct from Lycoming but can't find any limit in their overhaul manual)....