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originally posted by: Zaphod58
Among the changes being made to the F-15 for the Qatar deal is a new wing that according to Boeing strengthens the structure without changing the aerodynamics. Should the USAF decide to perform a SLEP on their existing F-15Cs, this is one possible upgrade that can be performed to extend the life of the airframe.
The Air Force has been talking about keeping some F-15s in service past 2030. Each of those aircraft would require a $1M longeron replacement. If yeti choose to keep them longer they'll require a new wing.
They found the original longerons were cut to the wrong thickness.
It's mostly stainless steel construction, isn't it?