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2012年11月3日，美国加利福尼亚州爱德华兹空军基地，美国空军 F-35A“闪电”II 常规起降型系统发展与验证机开始进入大迎角试飞阶段，将分架次从20度逐步增加至设计限制的50度。（F-35A test aircraft AF-4 flies a high angle of attack (AOA) mission Nov. 3. The F-35 is designed to fly to a 50 degree angle of attack, which was achieved on the fourth AOA test mission. The aircraft has an emergency spin chute installed to help return the aircraft to controlled flight in the case that AOA test push the aircraft out of flight control limits.）

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