专家指出，健康检查和犯罪背景调查或许只能起到有限作用，难以发现那些已经受到极端思想影响或试图隐瞒心理健康问题的飞行员。
Health screenings and criminal background checks may go only so far in identifying pilots who have become radicalized or try to hide their mental health issues, experts said.
本周发生的迪拜航空飞机上副驾驶袭击机长的事件，不仅引发了对其作案动机的疑问，也让人对他是否成功规避了绝大多数民航飞行员必须接受的背景审查产生了质疑。
The violent cockpit attack by a co-pilot on a FlyDubai plane this week raised questions not only about his motivations but also about whether he might have evaded the background checks that most commercial airline pilots must undergo.
航空专家称，虽然飞行员需接受身体与心理健康检查以及犯罪背景调查，但这些措施在识别极端化倾向或刻意隐瞒心理问题的飞行员方面可能收效有限。
Aviation experts noted that pilots undergo physical and mental health screenings and criminal background checks but said those measures may go only so far in identifying pilots who have become radicalized or who try to hide their mental health issues.
据以色列官方透露，周三发生的迪拜航空事件中，该副驾驶在刺伤机长后试图使飞机坠毁，导致驾驶舱内发生激烈搏斗。
In the FlyDubai attack on Wednesday, Israeli officials have said that the co-pilot tried to crash the plane after stabbing the pilot, leading to a bloody struggle in the cockpit.
目前该事件的动机仍不明确，相关调查正在国际范围内展开。以色列总理内塔尼亚胡周四对福克斯新闻表示，该副驾驶曾接受过“伊斯兰极端思想的灌输”，但未作进一步说明。
Much remains unclear about the motive for the attack, which is the subject of an international investigation. Prime Minister Benjamin Netanyahu of Israel told Fox News on Thursday that the co-pilot had undergone “Islamist radical indoctrination” but did not elaborate.
事发时，这架飞机从阿联酋迪拜飞往特拉维夫，机上载有约170名乘客，多为以色列人。飞机在不到两分钟内骤降了超过17,000英尺，最终其他两名机组成员控制住副驾驶，将飞机安全降落在沙特阿拉伯。
The plane, which was flying from Dubai, in the United Arab Emirates, to Tel Aviv with about 170 passengers, mostly Israelis, plunged more than 17,000 feet in less than two minutes before passengers were able to overpower the co-pilot. Two other pilots who were onboard then took the controls and landed the plane in Saudi Arabia.
丹佛都会州立大学航空与航天科学教授杰弗里·C·普赖斯介绍，在美国，飞行员需接受犯罪记录审查以排查过往定罪情况，同时运输安全管理局还会进行威胁评估，核查其是否曾被列入联邦执法数据库中的“重点关注人员”名单。
In the United States, pilots undergo a criminal history check that looks for past convictions as well as a threat assessment by the Transportation Security Administration that examines whether they have ever been flagged as a “person of interest” in federal law enforcement databases, according to Jeffrey C. Price, a professor of aviation and aerospace sciences at Metropolitan State University of Denver.