Ethiopia and Indonesia crash parallels heap pressure on Boeing

ADDIS ABABA/PARIS, - Investigators into the Boeing Co 737 MAX crash in Ethiopia have found striking similarities in a vital flight angle with an airplane that came down off Indonesia, a source said, piling pressure on the world’s biggest planemaker.

The Ethiopian Airlines disaster eight days ago killed 157 people, led to the grounding of Boeing’s marquee MAX fleet globally and sparked a high-stakes inquiry for the aviation industry.

Analysis of the cockpit recorder showed its “angle of attack” data was “very, very similar” to that of the Lion Air jet that went down off Jakarta in October, killing 189 people, a person familiar with the investigation said.

The angle of attack is a fundamental parameter of flight, measuring the degrees between the air flow and the wing. If it is too high, it can throw the plane into an aerodynamic stall.

“If that’s the case, that does raise the possibility that there is a similar occurrence between the Lion Air and Ethiopian Airlines accidents,” said Clint Balog, a Montana-based professor at Embry-Riddle Aeronautical University. Even then, it was too early to draw firm conclusions, he added. A flight deck computer’s response to an apparently faulty angle-of-attack sensor is at the heart of the ongoing probe into the Lion Air crash.

Ethiopia’s Transport Ministry, France’s BEA air accident authority and the U.S. Federal Aviation Administration (FAA) have all pointed to similarities between the two disasters, but safety officials stress the investigation is at an early stage. “Everything will be investigated,” Ethiopian Transport Ministry spokesman Musie Yehyies told Reuters.

Both planes were 737 MAX 8s and crashed minutes after takeoff with pilots reporting flight control problems.

Under scrutiny is a new automated system in the 737 MAX model that guides the nose lower to avoid stalling, while Boeing has raised questions in the Lion Air case about whether crew used the correct procedures.

Lawmakers and safety experts are asking how thoroughly regulators vetted the system and how well pilots around the world were trained for it when their airlines bought new planes. Boeing Chief Executive Dennis Muilenburg, facing the biggest crisis of his tenure, said on Monday the company understands that “lives depend on the work we do.”

Muilenburg also said a software upgrade for its 737 MAX aircraft that the planemaker started in the aftermath of the Lion Air deadly plane crash was coming “soon.”

The fix was developed when regulators suggested false sensor data could cause a system known as MCAS (Maneuvering Characteristics Augmentation System) to overreact and make the jet hard to control.

Canada is re-examining the validation it gave Boeing’s 737 MAX jets, following reports of a U.S. probe into the aircraft’s certification by the FAA, Canadian Transport Minister Marc Garneau said on Monday. Acting FAA Administrator Dan Elwell said on Wednesday in a call with reporters that he was “absolutely” confident in the certification of the Boeing 737 MAX 8. The FAA did not immediately respond to a request for comment on Canada’s action. The FAA finds itself in the hot seat, especially over its decision to certify the 737 MAX without demanding additional training. FAA and Boeing will face congressional questions about why the software upgrade took so long to complete and whether Boeing had too great a role in the certification process.