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May 29, 2023 at 7:27 comment added Jörg W Mittag "the lifespan of any aircraft is based on, among other things, […] maintaining a competitive operating cost" – Yep. Typically, it is external factors that limit the lifespan. For example, in Germany, new noise pollution regulations forced operators of aircraft that operate in low-level flight in residential areas (in other words, law enforcement and emergency services helicopters) to change their helicopters (either upgrade them with hush kits where available or buy newer, quieter models), not any sort of mechanical issue.
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May 27, 2023 at 16:29 history answered user22445 CC BY-SA 4.0