>>232
https://namu.wiki/w/F-22/%EA%B0%9C%EB%B0%9C%20%EC%97%AD%EC%82%AC

Google翻訳で韓→英翻訳してみると

「The first Preliminary Flight Rating Test (PFRT) and Ground
Accelerated Mission Test (AMT) were conducted in 1986 with an
unresponsive prototype engine. It was two years later that the
evaluation was conducted with a sensitive engine. They start to develop
the propulsion system for the next tactical system as much as
possible」

F119とF120は1986〜88年にPFRTを済ませていた模様。

今もアメリカは第6世代戦闘機の開発に先行して
可変サイクルエンジンADVENTの開発やってますし。