Boeing is said close to issuing warning on 737 Max after crash

Elias Hubbard
November 8, 2018

"This bulletin reiterates existing, well-established procedures for 737 Max 8 pilots".

Essentially the Boeing bulletin tells the pilots to follow the manual's instructions.

A USA aviation regulator plans to mandate that airlines follow an advisory issued by Boeing Co. The angle of attack sensor replaced in Bali would be analysed at its place of manufacture in Chicago, the accident investigator said.

But the National Transportation Safety Committee (NTSC) said Monday that the black box data showed the plane had an air speed indicator issue on at least two other earlier flights.

Investigation on the incident would be conducted by Inspector of Airworthiness and Aircraft Operation, Airport Inspector, and Aviation Safety Inspector in a bid to find out the cause and issue follow-up steps to be taken.

Personnel from National Transportation Safety Board examine debris from Lion Air flight JT610 at Tanjung Priok port in Jakarta, Indonesia, on November 1, 2018.

"Especially if you have a crew that's confused and doesn't know what's going on".

Boeing's newly issued bulletin focuses on the 737 MAX's angle-of-attack sensors, or AOA sensors, which are supposed to provide data about the angle at which wind is passing over the airplane's wings.

"If you don't take the appropriate action because you're surprised, you can make a serious error", he said.

Representatives of 737 Max operators, Singapore Airlines offshoot SilkAir, Garuda Indonesia and Canada's WestJet, said they had not yet received a bulletin from Boeing, Reuters reports. The company did not respond to a request for comment.

The jet dove into the Java Sea at high speed on October 29, minutes after its takeoff from Jakarta in Indonesia. The agency said the pilots were dealing with an erroneous airspeed indication. The company's shares rose less than 1 percent to $367.51 at 10:55 NY. The stock had climbed 24 percent this year through Tuesday.

Some modern aircraft have systems created to correct the posture of the wings automatically to keep flying safely. When the AOA sensor input to the computer is erroneous, it can result in a trim of the stabilizer to a nose down position in increments lasting up to 10 seconds.

Boeing added that issuing bulletins or recommendations regarding the operation of its planes is a "usual process".

Flight crews should follow a separate protocol to halt the plane's potentially risky action, according to the bulletin. The only way to prevent this, is for the pilot to intervene and manually deactivate the system. If the angle is too high as a plane climbs, that would cause a stall.

The US-based aircraft manufacturer plans to warn operators that these jets can abruptly dive because of "erroneous readings from a flight-monitoring system", according to the outlet. But the urgency of a fatal accident can trigger a flurry of such notices.

The airline said at the time that it had 61 "firm orders" for the planes.

Other reports by Click Lancashire

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