Boeing 737 MAX pilots frantically searched manual as craft flew into water – report: ずくなしの冷や水

2019年03月20日

Boeing 737 MAX pilots frantically searched manual as craft flew into water – report

RT2019/3/20
Boeing 737 MAX pilots frantically searched manual as craft flew into water – report
The pilots of the Lion Air Boeing 737 MAX were searching in manuals for a solution to an apparent malfunction of a flight assistance system right until the aircraft plunged into water killing 189 people on board, Reuters reports.

The news agency provided additional details about the October 2018 crash based on three sources who are familiar with what was found on the airliner’s flight recorders.

A preliminary report into the incident was released in November, but the recorders were recovered only in January, and their transcripts were not made public.

According to the story, the first officer and later the captain of the jet were going through a handbook for a solution to the abnormal aircraft behavior they were experiencing.

They continued doing it right until the Boeing plane plunged into the Java Sea. The first officer, who was manning the control column right before the crash, seemed to become desperate, as indicated by weaker inputs than those made by the captain.

“It is like a test where there are 100 questions and when the time is up you have only answered 75,” once source said. “So you panic. It is a time-out condition.”

The crew was also oblivious to the fact that the plane’s anti-stall system, which was misled by a faulty sensor into detecting a stall, was using the plane’s trim system to push its nose down. The system is usually used to keep the aircraft level and the system is supposed to prevent the crew from lifting the nose too much.

“They didn’t seem to know the trim was moving down,” the same source said. “They thought only about airspeed and altitude. That was the only thing they talked about.”

The cause of the Lion Air flight crash is yet to be officially confirmed, but the prime suspect is the Manoeuvring Characteristics Augmentation System, or MCAS, which was developed for the 737 MAX. The US-based producer has since pushed a software upgrade which was supposed to change how much authority is given to the system in controlling the aircraft.

The suspected problem came under scrutiny again after yet another 737 MAX crash in Ethiopia, which, according to French air accident investigation agency BEA, showed “clear similarities” to the Lion Air disaster.

In a separate report this week, Bloomberg revealed that the aircraft which crashed in October was saved by an off-duty pilot in a similar emergency on the previous day.

The incident was mentioned in a preliminary report by the Indian flight authority last November. However, this did not reveal the presence of a third pilot or details of how the disaster was averted.

RT2019/3/20
Off-duty pilot reportedly saved Boeing 737 MAX from crashing day before disaster
An extra pilot, who hitched a ride on a Lion Air Boeing 737 MAX a day before its crash in October, saved it during an emergency strikingly similar to the one that proved fatal, Bloomberg reports.

The new airliner plunged into the Java Sea killing all 189 people on board apparently due to a malfunction in an anti-stall system which pushed the nose of the aircraft down.

A day before the crash the same aircraft experienced a similar problem but was saved by an off-duty pilot who realized what was happening and instructed the crew on how to stop the system from affecting the flight, the agency said.

Indonesian air authorities earlier reported the incident itself and said a checklist of procedures were followed to handle the situation. But the presence of a third pilot in the cockpit or how the disaster was averted was not mentioned in the preliminary report into the crash, which was released in November. Bloomberg cites two people familiar with Indonesia’s investigation as sources for its story.

The Manoeuvring Characteristics Augmentation System, or MCAS, is designed to prevent the crew from accidentally lifting the nose of the jet too high which may result in stalling.

Before the crash a faulty sensor apparently indicated this was happening while in reality the plane was safe. The system pushed the nose of the 737 MAX down, plunging it into the sea.
posted by ZUKUNASHI at 23:30| Comment(0) | 国際・政治
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