Boeing warns pilots about 'angle of attack' sensors after 737 MAX crash

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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. Aviation systems must account for possibility of misinterpretations of situations and foggy memories of procedures outlined in the manuals that come with these huge, complicated, and incredibly sensitive vehicles.

Separately, Boeing has issued an Operations Service Bulletin to all B737 MAX 8 operators to warn pilots of the procedures to be taken in the event angle of attack sensors generate erroneous indications.

Investigators examine engine parts from the ill-fated Lion Air flight JT 610 at a port in Jakarta on November 7, 2018, after they were recovered from the bottom of the Java sea.

The KNKT has interviewed crew and technicians on duty for two previous flights, while also retrieving the faulty sensor from Bali for inspection. Aviation regulators such as the FAA and the European Aviation Safety Agency often follow such actions by mandating that carriers follow the bulletins - something the FAA says it will do in this case.

"The draft of what will be conveyed by Boeing this morning has been presented to us", air accident investigator Nurcahyo Utomo said.

Soerjanto Tjahjono, chairman of the transport safety committee, said Wednesday that airspeed indicator malfunctions on the jet's last four flights, which were revealed by analysis of the flight data recorder, were intertwined with the sensor issue.

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

The system measures the direction of air flow over wings. It is one thing for an engineer to fix a problem once but if the problem persists as it did with this aircraft then there is something far deeper that needs greater attention suggest safety analysts. "It has sent a team to inspect the aircraft", the spokesman said. But the urgency of a fatal accident can trigger a flurry of such notices.

For a safe climb-out, the aircraft's nose is pitched up at a small angle. 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.

Further aggravating the situation would be the fact that the trim tabs would have likely eventually reached their fully deflected position-that is, positioned all the way down-so that when the pilots pulled back on the controls to try to level off, it would have been almost impossible to do so.

KNKT said it would attempt to reconstruct the jet's last flight using Boeing simulators in Seattle. There were more than 180 people on board.

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