- Faulty equipment and Indonesian carrier Lion Air's own safety failures had pilots fighting for control of their Boeing 737 MAX 8 as it plunged into the Java Sea on October 28, killing all 189 people aboard, investigators said Wednesday.
"We need to know what was the pilot discussion during the flight".
Investigators initially suggested the aircraft which crashed had an issue with its angle of attack (AOA) sensors. The sensor was replaced, but the problem continued.
"This condition is considered as unairworthy condition and the flight shall not be continued".
Aeronautics consultant Douglas Moss, a retired United Airlines pilot, said that Boeing and government regulators, among others, share blame for allowing the delivery of planes that operated in unexpected ways during emergencies and for failing to make the changes clear to pilots charged with flying them safely.
The Lion Air jet that crashed on October 29 received a "stick shaker" warning of an impending stall as it took off, but the crew reacted differently to pilots who had experienced a similar problem the night before. "A lot" could be attained by investigators from the voice recorder, Utomo said.
The preliminary report does not fully unravel the mystery behind the crash. The pilot then flags up that there is a "flight control problem".
Eleven minutes into the flight, the captain told air traffic control that the jet's altitude could not be determined as instruments were giving different readings. The controller approves this request.
Mary Schiavo, a former inspector general of the U.S. Department of Transportation, said the preliminary report offered a road map of final recommendations that are likely to emerge from the investigation.
How serious were the technical problems?.
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The report said erroneous AOA data affected measurements of speed and altitude, contributing to the crash.
Members of the National Transportation Safety Committee lift a box containing the flight data recorder from a crashed Lion Air jet.
There appeared to be particularly serious problems with the anti-stall system. Before losing contact, the flight crew had taken manual control to keep the aircraft's nose up and were successful in counteracting the anti-stall system, but only for a brief time.
Pilots tried to correct this by pointing the nose higher, until the system pushed it down again. Before crashing, the pilot asked to return to the airport, but couldn't.
As our customers and their passengers continue to fly the 737 MAX to hundreds of destinations around the world every day, they have our assurance that the 737 MAX is as safe as any airplane that has ever flown the skies. Both the pilot and co-pilot of Flight 610 were experienced, the airline has said, with 6,000 and 5,000 flight hours respectively.
"The plane was no longer airworthy and it should not have kept" flying, he added.
The report provided new recommendations to Lion Air on safety on top of earlier recommendations about the flight manual that have already been implemented by Boeing. The company sent out its public alert more than a week after the Lion Air crash.
Budget airline Lion Air has in recent years risen to become a major player in South East Asia's low cost aviation sector.
The state-of-the-art 737 MAX 8 airplanes do not have this feature, yet the company failed to prominently warn pilots of the change even as airlines worldwide began taking delivery of the new jets a year ago, pilots say.
Overall, Indonesia's aviation safety record has improved a lot since the days when even its national carrier Garuda was blacklisted from European and USA airports over safety concerns.