Archive for the ‘Ethiopian Airlines Flight 302’ Category

Ethiopian Airlines flight’s stall prevention software was active at crash, CEO says

March 25th, 2019
BISHOFTU, ETHIOPIA - MARCH 11:  Parts of an engine and landing gear lie in a pile after being gathered by workers during the continuing recovery efforts at the crash site of Ethiopian Airlines flight ET302.

Enlarge / BISHOFTU, ETHIOPIA - MARCH 11: Parts of an engine and landing gear lie in a pile after being gathered by workers during the continuing recovery efforts at the crash site of Ethiopian Airlines flight ET302. (credit: Jemal Countess/Getty Images)

The chief executive of Ethiopian Airlines told the Wall Street Journal in an interview published today that he had reason to believe that software intended to prevent Boeing 737 MAX aircraft from stalling in flight had been activated aboard Ethiopian Airlines Flight 302 shortly before its crash. CEO Tewolde Gebremariam said that “to the best of our knowledge,” the Maneuvering Characteristics Augmentation System (MCAS) for stall prevention was active at the time of the crash.

This is the first time anyone connected to the Flight 302 investigation has specifically referenced the flight software as being involved. Ethiopian and French investigators had noted similarities in flight data to that of the ill-fated Lion Air Flight 610, a crash that was determined to be at least partially caused by the MCAS software’s malfunction due to a faulty sensor input. Investigators also cited the Flight 302 crew’s lack of training on how to shut the MCAS system down in the critical moments before the crash.

Gebremariam did not share what details he had received that led to his conclusion. But he did say that it would be difficult for Boeing to restore trust in the 737 MAX aircraft’s safety, and he was critical of Boeing’s failure to do more to inform airlines of the changes in operation related to MCAS when it was introduced. “In retrospect I would have expected them to have been more transparent on the MCAS, the technicalities of the MCAS, what it does and what it doesn’t do,” he told The Wall Street Journal. And after the first 737 MAX crash in Indonesia, the CEO said, “more should have been done from the Boeing side in terms of disclosure, in terms of coming up with strong procedures, stronger than what they gave us.”

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Safety feature that could have prevented 737 MAX crashes sold by Boeing as an option

March 21st, 2019
Boeing passenger jet shortly after takeoff.

Enlarge (credit: Marian Lockhart / Boeing)

The crashed Lion Air 737 MAX and the Ethiopian Airlines 737 MAX aircraft had more in common than aircraft design and the apparently malfunctioning flight system that led to their demises. Both of the planes lacked optional safety features that would have alerted the pilots to problems with their angle of attack (AOA) sensors—the input suspected of causing the Maneuvering Characteristics Augmentation System (MCAS) software to put both aircraft into a fatal dive.

The New York Times reports that both vehicles lacked an "AOA disagree" light—a warning light that indicates when the aircraft's two AOA sensors provide different readings—and an angle of attack indicator. Since the MCAS system relied only on one of the aircraft's AOA sensors, the disagree light and AOA indicator would have given the flight crew visible evidence of a sensor failure and prompted them to disable the MCAS. But both of these features were sold by Boeing as expensive add-ons. And many discount and smaller airlines declined to purchase them, as they were not required by regulators.

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Posted in air safety, Biz & IT, Boeing 737 MAX, Ethiopian Airlines Flight 302, flight control systems, Lion Air Flight 610, MCAS | Comments (0)

737 MAX crashes “linked” by satellite track data, FAA says

March 14th, 2019
Relatives of the victims of the Sunday plane crash take a picture next to a pile of airplane fuselage at the crash site of the Ethiopian Airlines operated Boeing 737 MAX aircraft, at Hama Quntushele village in the Oromia region, on March 13, 2019. - A Nairobi-bound Ethiopian Airlines Boeing crashed minutes after takeoff from Addis Ababa on March 10, 2019, killing all eight crew and 149 passengers on board, including tourists, business travelers, and "at least a dozen" UN staff. Families of the victims were taken to the remote site on March 13, 2019, where the plane smashed into a field with 157 passengers and crew from 35 countries, leaving a deep black crater and tiny scraps of debris.

Enlarge / Relatives of the victims of the Sunday plane crash take a picture next to a pile of airplane fuselage at the crash site of the Ethiopian Airlines operated Boeing 737 MAX aircraft, at Hama Quntushele village in the Oromia region, on March 13, 2019. - A Nairobi-bound Ethiopian Airlines Boeing crashed minutes after takeoff from Addis Ababa on March 10, 2019, killing all eight crew and 149 passengers on board, including tourists, business travelers, and "at least a dozen" UN staff. Families of the victims were taken to the remote site on March 13, 2019, where the plane smashed into a field with 157 passengers and crew from 35 countries, leaving a deep black crater and tiny scraps of debris. (credit: TONY KARUMBA / AFP / Getty Images)

The Federal Aviation Administration issued an emergency order grounding all Boeing 737 MAX aircraft on March 13, citing new data that showed a possible link between the March 10 crash of an Ethiopian Airlines flight and the crash of a Lion Air flight off the coast of Indonesia last October. In an interview with NPR's David Greene this morning, acting FAA Director Dan Ewell said that "newly refined satellite data" from a flight telemetry system had led the agency to make the move.

Both Ethiopian Airlines Flight 302 (ET302) and Lion Air Flight 610 (JT610) were recently acquired 737 MAX 8 aircraft, and both were lost with all aboard just minutes after take-off. According to the emergency order issued by the FAA, "new information from the wreckage concerning the aircraft's configuration just after takeoff that, taken together with newly refined data from satellite-based tracking of the aircraft's flight path, indicates some similarities between the ET302 JT610 accidents that warrant further investigation of the possibility of a shared cause for the two incidents that needs to be better understood and addressed."

The source of the data in question is a combination of telemetry feeds from the flights' Automatic Dependent Surveillance(ADS) system. Introduced in the US in 2001 and more widely worldwide in the wake of the crash of Malaysian Airlines flight 370 in 2014, Europe has required most aircraft to carry the UHF-band ADS-Broadcast (ADS-B) system since 2017, and the FAA has mandated ADS-B for most aircraft by 2020.

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