G in C,
Other than just pulling a figure out of a hat, what led you to recommend 15 years as the maximum life? Surely it depends on type of usage, hours flown, climates in which it's been operated, maintenance history and many, many other factors. There are many S61s, 76s, 212s, 365s, 355s, 350s, 206s, plus many others out there which are considerably older than 15 years and fly safely every day. Surely you remember that when the S76 first came out, as a new helicopter it killed GH
. Surely age is just a meaningless number - it's what's happened along the way which should count more.