Indonesian investigators say a combination of design problems and other issues were to blame for a Boeing 737 Max 8 jet crashing shortly after it left Jakarta last year. The investigation found that a lack of pilot training and poor flight crew performance also were partly responsible for the crash.
All 189 people on the plane were killed.
A summary version of the final report said the pilots did not know how to react to problems in the plane's automated flight-control system.
The Indonesian government has yet to release the full report.
The investigators identified nine problems that they believe were responsible for the deadly crash.
Chief investigator Nurcahyo Utomo told reporters that, If one of the nine had not occurred, maybe the accident wouldn't have happened.
The airplane belonged to the Indonesian company Lion Air, a low cost carrier. On October 29, 2018, the Boeing 737 Max 8 disappeared from radar after the pilots told air traffic controllers that the plane was not gaining altitude and speed as it should.
Five months later, a similar situation happened on the same kind of Boeing jet in Ethiopia. That plane also crashed, killing 157 people.
After the Ethiopian crash, Boeing was put under intense pressure to explain what had happened. Many countries barred the 737 Max 8 from their airspace.
A short time later, all Max 8 jets were banned from flying and they have yet to return to service. The problems with the jets have brought attention to the safety certification process in the United States.
The American company released a statement Friday. Boeing said it was working to consider all the safety recommendations to prevent a similar problem. The company said it has redesigned the flight control system to operate using two sensors.
The U.S. Federal Aviation Administration (FAA) welcomed the recommendations from the investigation.
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印尼多位调查人员称，诸多设计问题以及其他一些问题是波音737 Max 8型号的飞机在去年从雅加达起飞后就坠机的原因 。此次调查发现：飞行员缺乏培训、机组人员表现不力，这两点也是坠机的部分原因 。
该飞机是印尼航空公司狮航所购，成本较低 。2018年10月29日，该飞机与雷达失联 。在此之前，几位飞行员告诉空中交通指挥员说飞机无法达到本应该可以达到的高度和速度 。
5个月后，类似的情况在埃塞俄比亚的同类波音机型上发生了 。这架飞机坠毁，导致157人死亡 。
在埃航飞机坠毁后，各方向波音施加了巨大的压力，让波音公司解释究竟是怎么回事 。很多国家都禁止在航班中使用737 Max 8的机型 。
不久后，所有Max 8的机型都禁止在航班中使用，目前尚未回复使用 。该机型飞机存在的问题已经引起了人们对美国安全认证流程的关注 。
波音公司周五发布了一份声明 。波音公司称自己正在考虑防止类似问题发生的安全建议 。波音公司还说自己重新设计了飞行控制系统——用2个传感器来运作 。
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