A Boeing-led review of a stall-prevention system suspected in the deadly crashes of two of the company’s new 737 Max jetliners has detected an additional software problem that the FAA has ordered fixed before the planes are cleared to fly again.
By Aaron C. Davis , Aaron C.
As in the aftermath of a Boeing 737 Max 8 crash in Indonesia in October, attention in the Ethiopian Airlines crash has zeroed in on a flight-control system known as the Maneuvering Characteristics Augmentation System, or MCAS, which pushes the nose of the aircraft down to avoid a stall. Boeing initially said it planned to submit fixes for its stall-prevention system to the FAA for review last week. On Monday, an FAA spokesman said the agency instead expected to receive the final package of software “over the coming weeks.”
The preliminary report, which stops short of determining the cause of the crash, chronicles the chaotic last moments in the cockpit before the crash.The report indicates that a minute after takeoff from Bole International Airport, one of the angle-of-attack sensors sent bad information to the aircraft’s computer system, activating the stick shaker — a vibration in the pilots’ controls that warns of an impending stall.
According to black-box data released by Ethiopian investigators, the pilots struggled to regain control of the plane from the system, which repeatedly put the plane into a descent. The pilots tried to use a backup manual trim system in an attempt to raise the plane’s nose. The trim system is also used to stabilize a plane.
“We did not find any information regarding the foreign object damage on the aircraft,” he said. “Is there a structural design problem? No, we cannot verify that now.”[All eyes are watching as Boeing prepares software update months after Indonesia plane crash] After the Lion Air crash, Boeing proposed a software fix in November that would have prevented MCAS from engaging in a situation like the one that developed during the Ethiopian Airlines flight, according to a document obtained by The Post.
Boeing said it would take about an hour for technicians to load the MCAS software update for the planes. The software fixes will change the way MCAS receives information, requiring feeds from both angle-of-attack sensors rather than just one before the anti-stall system is triggered. It is unclear how the additional problem will affect the update timetable.
There have been 17 generations of the 737 since it began flying, and Boeing wanted the Max to perform exactly like its predecessor, the 737 NG.
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