|Quoting tsugambler (Reply 3):|
I would have thought such an upgrade to be prohibitively expensive, but apparently not.
|Quoting 411A (Reply 4):|
Except for a prototype, not done, because the specific 707 design did not lend itself to re-engining...with the CFM56. and be economical, at the same time.
|Quoting SEPilot (Reply 6):|
Actually, the 707 was re-engined with the CFM56, but only military versions (as well as the KC-135, which is a different plane.) They did not do it commercially because the 757 and 767 were already in development by the time the CFM56 was ready, and few customers were interested in re-engining old 707's. Granted, the 707's were a less attractive candidate, being less rugged and also smaller than the Super 60 DC-8's.
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