Ken
It's probably because at the time of building the DC-3 the technology was
insufficient to be accurate about fatigue of the airframe and attached parts.
Therefore they built stronger than necessary just to be sure. Nowadays they
can be more precise about expenditure of fatigue index while in service.
Chris
On 24 Aug 2011, at 15:46, Ken Norton wrote:
> The interesting thing about the DC-3, which probably was never
> expected, is that the remaining remnents of the fleet aren't being
> grounded from wearing out, but from operational costs. Granted, most
> of them are looking pretty beat up and scary, but still flyable.
> Decades of flying cargo have taken their toll.
--
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