Boeing to issue safety advice on 737 MAX after Indonesia crash

Boeing to issue safety advice on 737 MAX after Indonesia crash

Boeing to issue safety advice on 737 MAX after Indonesia crash

There are also procedures for pilots to follow in the event of missing data from damaged sensors on the fuselage, but it remained unclear how much time the crew of flight JT610 had to respond at the relatively low altitude of around 5,000ft.

Indonesian investigators said Wednesday that an AOA sensor on the jet was replaced the day before the doomed flight, on October 28, when a pilot flying the same aircraft on a different route, from Bali to Jakarta, reported problems with it.

Indonesian investigators on Wednesday said the sensor was replaced on the Lion Air plane the day before its fatal flight and may have compounded other problems with the aircraft. "Whenever appropriate, Boeing, as part of its usual processes, issues bulletins or makes recommendations regarding the operation of its aircraft".

The doomed jet was a Boeing 737 -Max 8, one of the world's newest and most advanced commercial passenger planes, and there is still no answer as to what caused the crash.

That sensor, known as the "angle of attack" sensor, keeps track of the angle of the aircraft nose to help prevent the plane from stalling and diving. The 2-month-old plane went into a sudden dive minutes after takeoff, which the pilots were able to recover from. Its flight crew had requested permission to return to the airport several minutes after taking off.

A problem would occur if the AOA sensor input is erroneous.

Even if an angle of attack sensor on a jet is faulty, there's generally a backup system in place for the critical component, and pilots are trained to handle a plane safely if those sensors fail, airline safety experts said. FDR data resulted in investigators determining that if an erroneously high single AOA sensor input is received from the aircraft's flight control system, there is a potential for the 737 to repeatedly perform nose-down trim commands of its horizontal stabilizer.

"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.

On November 6, Boeing said it had issued an Operations Manual Bulletin (OMB) directing operators to existing flight crew procedures to address circumstances where there is erroneous input from an AOA sensor.

"A "ping" has been detected from the second black box but the signal was very weak, possibly because it was encased in mud", said Nurcahyo Utomo, an air accident official at the transportation safety committee (KNKT).

There are a total of 49 Boeing 737 Max planes in service across the USA, including 26 737 Max 8 planes in service at Southwest Airlines, 16 at American Airlines and seven Max 9 planes at United Airlines.

captionItems recovered from the crash of Lion Air Flight 610.sourceEddy Purwanto/NurPhoto via Getty ImagesIn addition, the analyst explained that such bulletins were quite common, though they seldom follow such a tragedy. All 189 people on board the flight were killed.

Lion Air is one of Indonesia's youngest and largest airlines, flying to dozens of destinations at home and internationally.

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