Airliner engines - rotation
I have often wondered how engineers working on multi engined airliners stagger the engine life so that all the powerplants dont have to be changed at the same time.
For example on a BA 747 due routine snags mean the 4 engines are, through the process of time, all at different hours after they have been changed or do the engineers have to plan in engine changes during down time to stagger out the hours.
Im sure I have read somewhere a BA 747 held some form of record for a RB211 which had spent a long time hanging on a wing