Boeing issues advice over sensors after LionAir crash

The bulletin warns operators that erroneous readings from a flight-monitoring system can cause the new 737 Max models to aggressively dive

The sensor - which helps the plane's computers determine if its nose is too high in the air - had been the cause of problems on the aircraft's last four flights before the crash.

A statement and copy of the new directive obtained by Avionics International notes that the agency is issuing an emergency AD requiring a Boeing 737 MAX flight operations manual update.

"Over the last 40 years, Boeing and Chinese partners have built deep relations in all industrial chains, including the research of new technologies, parts manufacturing as well as flight maintenance and modification", the statement said. However, in rare instances, accidents have been caused by what investigators call a "startle factor". Chairman Soerjanto Tjahjono said the airspeed indicator and sensor problems are related. A misreading in the sensor can cause a plane to dive suddenly.

The Angle of Attack sensor, shown to reporters at a press conference in Jakarta on Wednesday, was manufactured by Minnesota-based Rosemount Aerospace Inc.

There are also procedures for pilots to follow in the event of missing data from damaged sensors on the fuselage skin, but it remains unclear how much time the crew of flight JT610 had to respond at the relatively low level at which they were flying.

The plane was said to be leaving the terminal and taxiing around 6.30 pm on Wednesday, November 7, readying for takeoff to Jakarta, when it hit the lamp post, reported the Australian.

Lion Air's first two attempts at fixing the sensor were unsuccessful before it was replaced on October 28 - a day before the plane plunged into the ocean, the ABC reported.

Safety investigators said the plane may have hit speeds of 600 miles per hour before hitting the water. Indonesian investigators said today that an instrument measuring the angle of the plane malfunctioned despite having been replaced a short time earlier.

Boeing said it is cooperating fully and providing technical assistance as the investigation continues.

While modern jetliners primarily operate on autopilot, the computerized system can disengage when airspeed indicators malfunction, forcing pilots to manually fly the aircraft.

And in this case the procedure for dealing with the problem it is what is called a "memory item" - pilot's commit them to memory.

The FAA has warned pilots of this happening and said it would "take further appropriate actions depending on the results of the investigation".

Over 200 737 Max jets are already in use in commercial aviation, Bloomberg added, though Boeing has orders for 4,500 more. "The tariffs are pushing Boeing to start local production", Bai said.

"We're going to learn from this just like we learned from the A330", he said, referring to a 2009 incident in which an Airbus A330 crashed off the coast of Brazil with 228 people on board due to electronics failures.

Related:

Comments

Latest news

Another horse has died at the Melbourne Cup
McEvoy had to use his renowned nous to avoid serious trouble as Irish challenger The Cliffsofmoher suffered a fatal injury early in the race.

Agents and executives reportedly believe Phillies will land Bryce Harper
But no position player has ever earned an average annual value of more than $US27.5 million (Alex Rodriguez and Yoenis Cespedes). Zack Greinke ($US34 million), David Price ($US31 million) and Clayton Kershaw ($US31 million) all got more.

White House suspends credentials for CNN's Jim Acosta
As I told the officer, I don't blame him. 'I think you should let me run the country and you run CNN , ' he snapped. Mr Acosta's press pass was later cancelled amid accusations that he "placed his hands" on the intern .

Tesla announces Elon Musk's replacement as board chair: Robyn Denholm
She has only been CFO since October 1 this year, though she joined Telstra in January 2017 as its chief operations officer. Electric auto company Tesla has appointed an executive at Australian company Telstra to chair its board.

Online Sports Betting Market Growth
Benefits With the market high, sports betting is an activity that receives a high level of support from online betting companies. More betters are opting to forego the long lines at the cashier's counter and the unavailability of their favorite machines.

Other news