https://aviation.stackexchange.com/questions/11967/what-limits-the-lifespan-of-helicopters >>The military aircraft have the shorter life in terms of flying hours, the Civil Commercial the longest life in terms of flying hours where as the Civil Private / light aircraft have a very long life in terms of years. A military aircraft can have an airframe file of say 4,000 to 6,000 hours compared to some civil commercial aircraft with an airframe life of 60,000 to even a 100,000 hours. 8760 hours in a year / 100000... That's 11 years roughly for the airframe >>Now, I worked on the RAF HC1 Chinooks from 1988 to 1991. In April 2018 I went to RAF Odiham on a photography shoot event organised by TimelineEvents.Com During that photoshoot I saw aircraft that I had worked on whilst I was on 7 Squadron i.e this particular aircraft must originally been delivered to the RAF in about 1986 making it about 32 years old. However, I would say that the **rotor blades will / must be less than 5 years old**. Again, another however, the **Engines (2 off) and gear box’s** (5 off) will of be an indeterminate age but will / **must contain a mixture of bits dating from less than 12 months old all the way through to the 32 years age of the original airframe**. I think though the most remarkable aircraft was ZA671. It was delivered to the RAF as a HC1 Chinook and returned and rebuilt by Boeing as a HC2. ... Anyway, what's for sure is that it's ALWAYS a bad idea to fly or sail during bad weather conditions Especially when it comes to small or medium sized civilian aircrafts/boats