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In rec.aviation.owning Keith Willshaw wrote:
"Tom S." wrote in message ... "Kevin Brooks" wrote in message ... 7E7 will offer airlines a new airframe (they can't fly the same old ones forever) No ? No. Aircraft have definite service lives. Surprised you did not know that. What's the service life of a DC-3? 10,665 were built of which less than 400 remain in flyable condition Nuff said. Keith Does the 10,665 include the C-47 and Li-2? -- Jim Pennino Remove -spam-sux to reply. |
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Boeings take on aircraft service life is that it can be indefinite so long
as the sircraft is maintained properly. There has never been a requirement to retire a Boeing aircraft after "X" number of whatevers. I suspect the 747 will fare far better than the DC-3 over a 70 year period. |
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In article 3523d.323018$Oi.300857@fed1read04,
"Leadfoot" writes: Boeings take on aircraft service life is that it can be indefinite so long as the sircraft is maintained properly. There has never been a requirement to retire a Boeing aircraft after "X" number of whatevers. I suspect the 747 will fare far better than the DC-3 over a 70 year period. While you're correct about Boeing's take on service life, the fact remains that, at some point in its life (the end, of course) a 747 will start showing cracks in wing spars, and the fuselage pressure vessel, and all manner of other areas, and it will become uneconomical to repair it. That's already happening. the DC-3 series of airplanes hasn't shown any of these behaviors. That's not too surprising, really - The DC-3's wing structure is fairly stiff, and it uses Jack Northrop's multi-cellular construction techniques. There are multiple load paths there, so individual elements aren't stressed too highly. It's not pressurized, so you're not inflating and deflating the cabin on each flight. The 747, and, for that matter, any other jet, is much more flexible, and has to put up with the stresses and strains of pressurization, At some point, it's going to give. -- Pete Stickney A strong conviction that something must be done is the parent of many bad measures. -- Daniel Webster |
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