SocketRocket
Ryder Cup Winner
Exactly, that's the point I'm making. Aero engine components are designed for reliability, it's absolutely vital they are, the components will have a life cycle but it would never be subject to built in obsolescence. If you design a component like a washing machine pump impeller such that it will fail long before major components like the Motor or Drum then you are purposely building a reduced potential life cycle for the machine. This is based on the precept that many users will replace the total rather than a component. I pointed out previously that for a fairly small cost the component could be manufactured such that it's expected lifecycle was longer. Built in obsolescence is designed to rip off the customer and IMO wrong.I'm certain you know, from your own career, it's all about balancing several variables...Cost (initial and long-term), Quality, Performance being the main ones! Servicing/Replacement schedules can be (and at least in the case of the Aero industry ARE) organised to optimise/balance those criteria according to the customer's requirements - even/especially with the likes of aero engines.
FWIW...How often do you change your vehicle's engine oil - and with what grade/price oil?
Edit...And a BTW...There's an implication in this thread (that I'm not sure is correct) that certain components are used BECAUSE they are likely to 'end the serviceable life' of a product'! I'm pretty certain that would not happen in the Aeronautics industry!