French investigators on Friday will begin analyzing data from the black boxes of the Boeing 737 Max plane that crashed after takeoff from Addis Ababa killing 157 people, the second such calamity involving the aircraft since October.
Experts will be looking for any links between Sunday’s Ethiopian Airlines crash and the October crash of a 737 Max operated by Lion Air in Indonesia that killed 189 people. The U.S. Federal Aviation Administration grounded all Boeing MAX jets in service because of similarities between the two crashes.
Boeing said it had paused deliveries of its fastest-selling 737 MAX aircraft built at its factory near Seattle, but continues to produce the single-aisle version of the jet at full speed while dealing with the worldwide fleet’s grounding.
Possible links between the accidents have rocked the aviation industry, scared passengers, and left the world’s biggest planemaker scrambling to prove the safety of a money-spinning model intended to be the standard for decades.
The flight data and cockpit voice recorders were handed over to France’s Bureau of Enquiry and Analysis for Civil Aviation Safety (BEA) on Thursday. Technical analysis would begin on Friday and the first conclusions could take several days.
U.S. lawmakers said on Thursday the 737 Max fleet would be grounded for weeks if not longer until a software upgrade could be tested and installed.
Boeing has said it would roll out the software improvement “across the 737 MAX fleet in the coming weeks.”
The captain of Ethiopian Airlines Flight 302 requested permission to return to Addis Ababa airport three minutes after takeoff as it accelerated to abnormal speed, the New York Times reported.
All contact between air controllers and Flight 302 to Nairobi was lost five minutes after it took off, a person who reviewed air traffic communications told the newspaper.
Within a minute of the flight’s departure, Captain Yared Getachew reported a “flight control” problem as the aircraft was well below the minimum safe height during a climb, the Times reported, citing the person.
After being cleared by the control room to turn back, Flight 302 climbed to an unusually high altitude and disappeared from radar over a restricted military zone, the person added.
Relatives of the dead stormed out of a meeting with Ethiopian Airlines on Thursday, decrying a lack of transparency, while others made the painful trip to the crash scene.
“I can’t find you! Where are you?” said one Ethiopian woman, draped in traditional white mourning shawl, as she held a framed portrait of her brother in the charred and debris-strewn field.
Nations around the world, including an initially reluctant United States, have suspended the 371 MAX models in operation, though airlines are largely coping by switching flights to other planes in their fleets.
Nearly 5,000 MAXs are on order, meaning the financial implications are huge for the industry.
“We continue to build 737 MAX airplanes while assessing how the situation, including potential capacity constraints, will impact our production system,” Boeing spokesman Chaz Bickers said.
Boeing would maintain its production rate of 52 aircraft per month, of which the MAX, its newest version, represents the major share. However, Boeing declined to break out exact numbers.
Under international rules, Ethiopians are leading the investigation but France’s BEA will conduct black box analysis as an adviser. The U.S. National Transportation Safety Board (NTSB) was also sending three investigators to assist.
The cause of the Indonesian crash is still being investigated. A November preliminary report, before the retrieval of the cockpit voice recorder, focused on maintenance and training and the response of a Boeing anti-stall system to a recently replaced sensor, but gave no reason for the crash.