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时间:2019-04-05 12:50来源:知社学术圈 作者:中国航空
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让我们看看调查报告所揭示的飞行员与飞机博命的这惊心动魄几分钟:

  1. 首先,左右攻角传感器读数出现偏差:At 05:38:44, shortly after liftoff, the left and right recorded AOA values deviated. Left AOA decreased to 11.1° then increased to 35.7° while value of right AOA indicated 14.94°. Then after, the left AOA value reached 74.5° in ¾ seconds while the right AOA reached a maximum value of 15.3°. At this time, the left stick shaker activated and remained active until near the end of the recording. Also, the air speed, altitude and flight director pitch bar values from the left side noted deviating from the corresponding right side values. The left side values were lower than the right side values until near the end of the recording.

  2. 一分钟后,自动飞行系统关闭:At 05:39:55, Autopilot disengaged。这是紧急情况下操作流程的一个步骤。

  3. 两秒后,飞行员报告塔台飞机控制出现问题:At 05:39:57, the Captain advised again the First-Officer to request to maintain runway heading and that they are having flight control problems.

  4. 三秒后,飞机机头自动下压:At 05:40:00 shortly after the autopilot disengaged, the FDR recorded an automatic aircraft nose down (AND) activated for 9.0 seconds and pitch trim moved from 4.60 to 2.1 units. The climb was arrested and the aircraft descended slightly.

  5. 十二秒后,飞行员启动电子配平系统以拉升机头(这也是紧急操作流程的一个步骤):At 05:40:12, approximately three seconds after AND stabilizer motion ends, electric trim (from pilot activated switches on the yoke) in the Aircraft nose up (ANU) direction is recorded on the DFDR and the stabilizer moved in the ANU directionto 2.4 units. The Aircraft pitch attitude remained about the same as the back pressure on the column increased.

  6. 八秒后,机头第二次自动向下:At 05:40:20, approximately five seconds after the end of the ANU stabilizer motion, a second instance of automatic AND stabilizer trim occurred and the stabilizer moved down and reached 0.4 units.

  7. 七秒后,机长要求大副与他一起上拉机头:At 05:40:27, the Captain advised the First-Officer to trim up with him.

  8. 一秒后,手动电子配平系统启动,机头重新向上:At 05:40:28 Manual electric trim in the ANU direction was recorded and the stabilizer reversed moving in the ANU direction and then the trim reached 2.3 units.

  9. 七秒后,飞行员按紧急流程启动stab trim cut-out 以关闭MCAS: At 05:40:35, the First-Officer called out “stab trim cut-out” two times. Captain agreed and First-Officer confirmed stab trim cut-out.

  10. 六秒后,机头第三次向下:At 05:40:41, approximately five seconds after the end of the ANU stabilizer motion, a third instance of AND automatic trim command occurred without any corresponding motion of the stabilizer, which is consistent with the stabilizer trim cutout switches were in the ‘’cutout’’position

  11. 三秒后,机长大喊三次上拉:At 05:40:44, the Captain called out three times “Pull-up” and the First-Officer acknowledged.


     
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    本文链接地址:埃航空难官方调查报告:手动关闭MCAS无济于事 操作完全符合波音指示!(2)