‘It could happen again’: Problem behind Boeing 737 MAX first crash may extend to other jets - expert

 rt.com  11/10/2018 9:48:00 AM 

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.

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The Boeing 737 MAX series. © boeing.com

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.

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