Archive for May 19th, 2022

Thursday, May 19, 2022

Enorth: China Eastern MU5735 Preliminary Investigation Report, April 20

wikipedia_airbus_a380_airliner

CCTV coverage, March 24, 2022

The following is my translation of a preliminary report (or its April-20 reproduction by Tianjin’s Enorth news portal) on China Eastern Yunnan Airlines MU5735 flight’s crash on March 21 this year. I.

My translation is partly based on an illustrative wiki which shows components of an Airbus A380. The crashed plane in question was a Boeing, but I couldn’t find a similarly informative description of a Boeing.

Questions, information and corrections are welcome.

“March-21” China Eastern MU5735 flight crash preliminary investigation status notification.
“3·21”东航MU5735飞行事故调查初步报告的情况通报
Source: Civil Aviation Administration of China website / author, [Enorth] editor: Jin Yongfeng / April 20, 2022, 17:37 h
来源: 中国民航局网站 作者: 编辑:靳永锋 2022-04-20 17:37:00

Summary: On March 21, 2022, a China Eastern Yunnan Airlines Boeing 737-800 type B-1791 on its MU5735 flight from Kunming to Guangzhou rapidly descended from its 8,900 meters travel altitude over Guangzhou air control territory, and finally fell to the ground and crashed in the Guangxi Zhuang Autonomous Region / Wuzhou City / Teng County / Langnan Township‘s / Molang Village.
内容提要:2022年3月21日,东方航空云南有限公司波音737-800型B-1791号机,执行MU5735昆明至广州航班,在广州管制区域巡航时,自航路巡航高度8900米快速下降,最终坠毁在广西壮族自治区梧州市藤县埌南镇莫埌村附近。

On March 21, 2022, a China Eastern Yunnan Airlines Boeing 737-800 type B-1791 on its MU5735 flight from Kunming to Guangzhou rapidly descended from its 8,900 meters travel altitude over guangzhou air control territory, and finally fell to the ground and crashed in the Guangxi Zhuang Autonomous Region / Wuzhou City Teng County Langnan Township’s Molang Village.
2022年3月21日,东方航空云南有限公司波音737-800型B-1791号机,执行MU5735昆明至广州航班,在广州管制区域巡航时,自航路巡航高度8900米快速下降,最终坠毁在广西壮族自治区梧州市藤县埌南镇莫埌村附近。飞机撞地后解体,机上123名旅客、9名机组成员全部遇难。

According to “International Convention on Civil Aviation regulations *), the investigating country must send a preliminary investigation report to the International Civil Aviation Organization (ICAO) within thirty days after the crash. This report’s content is often about factual information gathered until then, and does not include accident analysis or conclusions.
根据《国际民用航空公约》规定,在事故之日起30天内,调查组织国须向国际民航组织和参与调查国发送调查初步报告,其内容通常为当前所获取的事实信息,不包括事故原因分析及结论。目前《“3·21”东航MU5735航空器飞行事故调查初步报告》已完成,报告主要包括飞行经过、机组机务人员、适航维修、残骸分布等事实信息。主要情况如下:

The plane took off from Kunming Changshui International Airport’s runway 21 at 13:16, rose to its travel altitude of 8,900 meters by 13:27, and entered Guangzhou air control airspace along the A599  air route at 14:17. At 14:20:55 a “Deviation from prescribed altitude” alert appeared on Guangzhou air control’s radar. The plane broke away from its travel altitude, air control staff immediately called the crew, but got no reply. At 14:21:40, the radar recorded the last signal from the aircraft as “standard pressure altimeter 3,380 meters altitude at a groundspeed of 1,010 km per hour, direction 117 degrees”. Soon after, the radar signal disappeared.
飞机于北京时间13:16从昆明长水机场21号跑道起飞,13:27上升至巡航高度8900米,14:17沿A599航路进入广州管制区,14:20:55广州区域管制雷达出现“偏离指令高度”告警,飞机脱离巡航高度,管制员随即呼叫机组,但未收到任何回复。14:21:40雷达最后一次记录的飞机信息为:标准气压高度3380米,地速1010千米/小时,航向117度。随后,雷达信号消失。

wikipedia_airbus_a380_airliner

Aircraft tail, Wiki, CC BY-SA 3.0 – click picture for source –
this shows the design of an Airbus A380 which
may differ significantly from a Boeing 737

The crash site is in a valley stretching from the southeast to the northwest near Molang Village of Langnan Township in Teng County, of Guangxi Zhuang Autonomous Region’s Wuzhou City. A 45 square meters puddle of 2.7 meters depth is clearly visible on the ground, and has been determined to be the point of impact at 23° 19′ 25.52” north and 111° 06′ 44.30” east. The plane’s debris was mainly found on and under the ground in an azimuth of zero to 150 degrees from the point of impact. About twelve km from the point of impact, the right wingtip’s trailing edge was found. Mountain forests and vegetation at the crash site showed traces of fire. The right wingtip’s trailing edge was found about twelve km away from the impact point. Horizontal stabilizers and the vertical stabilizer, rudders, the left and right engines, the greater wings, body components, the undercarriage, cockpit inside components and other main wreckage were found at the site. After the wreckage had been searched and gathered, it was taken to a dedicated depot as a whole to be tidied up and to be identified,and for the pieces to be placed into their actual positions, to facilitate further inspection and analysis.
事故现场位于广西壮族自治区梧州市藤县埌南镇莫埌村附近一个东南至西北走向的山谷中。现场可见面积约45平米、深2.7米的积水坑,判定为主撞击点,位置为北纬23°19′25.52″,东经111°06′44.30″。飞机残骸碎片主要发现于撞击点0°至150°方位范围内的地面及地下。距主撞击点约12公里处发现右翼尖小翼后缘。事故现场山林植被有过火痕迹。现场发现水平安定面、垂直尾翼、方向舵、左右发动机、左右大翼、机身部件、起落架及驾驶舱内部件等主要残骸。所有残骸从现场搜寻收集后,统一转运到专用仓库进行清理、识别,按照飞机实际尺寸位置对应摆放,便于后续检查分析。

The Investigation shows that the flight crew on duty, the cabin crew and maintenance staff were qualified in accordance with the requirements, and the aircraft’s airworthiness documents were valid, with neither the most recent A-check (31A) nor the most recent C-check (3C) being beyond the time limits specified in the maintenance plans. There was no malfunction information before the flight and at the short-stop release on that day, no dangerous goods were declared, and the flight route, its vicinity and the monitoring equipment showed no anomalies. The last normal radiotelephony communication with the crew was at 14:16. The plane’s two flight recorders were badly damaged, and data restoration and analysis is ongoing.

经调查,当班飞行机组、客舱机组和维修放行人员资质符合要求;事故航空器适航证件有效,飞机最近一次A检(31A)及最近1次C检(3C)未超出维修方案规定的检查时限,当天航前和短停放行无故障报告,无故障保留;机上无申报为危险品的货物;此次飞行涉及的航路沿途导航和监视设施、设备未见异常,无危险天气预报;在偏离巡航高度前,机组与空管部门的无线电通信和管制指挥未见异常,最后一次正常陆空通话的时间为14:16;机上两部记录器由于撞击严重受损,数据修复及分析工作仍在进行中。

Follwing up, the technical investigation team will continue to carry out in-depth wreckage identification, classification and inspection, flight data analysis, the required tests, verification and other investigations.
后续,技术调查组将依据相关程序继续深入开展残骸识别、分类及检查、飞行数据分析、必要的实验验证等调查工作,科学严谨查明事故原因。

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Notes

*) also known as the Chicago Convention on International Civil Aviation
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Related

“Vicious smearing against China”, “Global Times”, May 18, 2022
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