Designed sure. But not built. That's one crucial difference. 1960s quality control technology was worse anyway, let alone compared with Soviet-built stuff from the era.
I'd have thought that they'd have to go to so much effort to check and refurb these engines, that it would be as cheap to build them new anyway. Given I believe they have a license to do so.
Imagine if an airline flew a 747 with some engines they found in the corner of an old hangar from 40 years ago, with no proper storage paperwork. I suppose, to be fair, that this is the sort of thing people do with historical aircraft. But they only risk their own lives, fly under strict rules at airshows, and don't carry $200m of other peoples' cargo.
Biting the hand that feeds IT
