新鋭機 Boeing 737 MAX 8 は大丈夫か: ずくなしの冷や水

2018年11月11日

新鋭機 Boeing 737 MAX 8 は大丈夫か

RT2018/11/10
MAXimized danger: Are 200+ new Boeing 737s plagued with glitch that led to crash in Indonesia?
A technical issue that Boeing flagged in a safety warning after the deadly 737 MAX 8 crash in Indonesia could happen to any other aircraft, and it’s "not unlikely" that the manufacturer knew about it, aviation experts told RT.

Earlier this week, Boeing issued a safety update to pilots flying its newest 737 MAX airliner, warning of a possible fault in a sensor that could send the aircraft into a violent nosedive. That sensor measures air flow over a plane’s wings, but its failure can lead to an aerodynamic stall.
International aviation experts told RT that a problem of this kind could doom aircraft of any type. The tragedy that happened to Lion Air’s Boeing 737 MAX is not the first of its kind to involve a faulty “Pitot tube” – a critical air-speed sensor that measures the flow velocity – explained Elmar Giemulla, a leading German expert in air and traffic law.

“This is not unusual in the way it happened before,” he noted, mentioning incidents similar to the Lion Air crash. Back in 1996, a Boeing 757 operated by Turkey’s Birgenair stalled and crashed in the Caribbean because of a blocked pitot tube. Likewise, erroneous air-speed indications, coupled with pilot errors, led to the crash of an Air France Airbus A330 over the Atlantic in 2009.

While the problem is not entirely new, it is unclear how Boeing had tackled it, according to Giemulla. “It is not very unlikely” that Boeing knew about the problem, he said, warning that “more than 200 planes are concerned and this could happen tomorrow again.”

There is so much experience with [using Pitot tubes] that it surprises me very much that this could happen to a newly developed plane.

However, the expert doubted that there has been any cover-up of the issue, instead suggesting that “obviously gross negligence” had been involved.

A 737 MAX 8 servicing Lion Air flight 610 last week ploughed into the waters of the Java Sea shortly after take-off from Jakarta, killing all 189 people on board. Investigators say there is a possibility that inaccurate readings fed into the MAX’s computer could have sent the plane into a sudden descent.
Meanwhile, David Learmont, an England-based aviation journalist and contributing editor of Flightglobal, suggested that the 737 MAX crash in Indonesia was more about poor maintenance or pilot error than the equipment itself.

He told RT that the ‘angle-of-attack’ sensor and the computerized system it feeds are “helpful but not essential to safe flight.”

Crews are usually trained to deal with this kind of failure and Boeing “has drawn the airlines’ attention to it,” he explained.

If the pilots had recognized what the problem was, it would have been possible for them to isolate the faulty system and fly the aircraft safely in the traditional way.

Lion Air had already known that a faulty sensor needed replacement “but believed they had fixed it.” Learmont argued that this is not a problem with the aircraft as such but a problem with a sensor system installed on other planes.

“Airbus uses angle-of-attack sensors also, as does Tupolev and other Russian manufacturers,” he said.

共同2018/10/30
【ジャカルタ共同】インドネシア首都ジャカルタの東方沖で格安航空会社(LCC)ライオンエアの旅客機が墜落した事故で、離陸2分後に旅客機から「飛行制御に問題が生じた」とジャカルタ空港の管制室に連絡があったことが30日、分かった。国家運輸安全委員会が明らかにした。
 運輸安全委によると、ジャカルタ空港出発から2分後の29日午前6時22分(日本時間同8時22分)ごろ、飛行制御に問題が生じたため、高度を1700フィート(約520メートル)から5千フィートに上げてよいかとの連絡が入り、管制側は了承したという。旅客機はその11分後に墜落した。

RT2018/10/29
Boeing 737 MAX 8 suffers its 1st deadly crash. What do we know about the jet?





・・・引用終わり・・・

離陸直後に飛行制御に問題が生じたとしています。機材の欠陥か整備不良はほぼ間違いない。

日本の航空会社ではまだ就航していないようです。

RT2018/11/7
Boeing’s new 737 MAX may ‘abruptly dive’ due to errors – media
Following the deadly 737 MAX 8 crash in Indonesia, Boeing is preparing to alert airlines that errors in its newest aircraft series can make the plane “abruptly dive,” Bloomberg revealed.

The bulletin from Boeing will say that erroneous readings from the jet's flight-monitoring system can cause the planes to “abruptly dive,” the newspapaer reported on Wednesday, citing a person familiar fight the company’s plans.

According to the report, the warning is based on the investigation of the Lion Air Flight 610 crash in Indonesia. On October 29, a Boeing 737 MAX 8 aircraft crashed in the sea shortly after takeoff, killing all 189 people on board.

Data extracted from the flight recorders revealed that the aircraft experienced problems with airspeed indicators during its last four flights.

The 737 MAX is Boeing’s newest and most advanced aircraft series, as well as the company’s bestseller. The jets were in high demand and enjoyed a good reputation as safe and reliable carriers.

However, last year Boeing had to briefly ground its 737 MAX fleet as discrepancies were found in its engines. Later, several jets were grounded by India’s Jet Airways, also due to engine problems.
posted by ZUKUNASHI at 00:40| Comment(0) | 国際・政治
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