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The Boeing 737 MAX 8, operated by Ethiopian Airlines, sank on March 10, southeast of Addis Ababa. By TONY KARUMBA (AFP / File)
Boeing needs to do more work on its proposed solution for the 737 MAX before it can be tested, US officials said on Monday, saying planes could be stuck for longer.
Additional work is needed "to ensure that Boeing has identified and appropriately addressed all relevant issues," a spokesman for the Federal Aviation Administration said in a statement.
"The FAA will not approve the installation of the software until the agency is satisfied with the submission," he added.
The FAA statement is the bureaucratic equivalent of a "stop sign" after Boeing officials touted their proposed solution last week during a media visit to the factory. manufacturing company in Seattle, Washington State.
The Boeing 737 MAXs were blocked worldwide last month, after the second of two fatal kills in less than five months.
Controls focused on an anti-stall system developed specifically for aircraft that posed problems for pilots.
A preliminary report on the second calamity – the Boeing Boeing 737 MAX 8 crash on March 10 – killing 157 people – is expected to be released this week, the Ethiopian government said on Monday.
Last week, Boeing badembled hundreds of pilots and journalists at its Renton, Wash., Manufacturing facility for a presentation on the proposed changes to the maneuver feature augmentation system, which would have been a key factor in the crash. Ethiopia and the crash of a lion in October. Air in Indonesia that killed 189 people.
Among the changes, the MCAS will not make more repetitive corrections when the pilot tries to regain control, and will automatically disconnect in case of disagreement between the two "angle of attack" or AOA sensors. announced the company last week.
Boeing is eager to get approval for a proposed solution that could put the planes back in the air.
But the FAA, which had been badly questioned last week during a congressional hearing regarding its Boeing oversight, said it expected Boeing to submit the proposed fix "in the coming weeks" after have undertaken additional work.
After that, the proposal will be subject to a "rigorous scrutiny of security," said the FAA spokesman.
Preliminary report this week
Earlier Monday, Ethiopian Foreign Ministry spokesman Nebiat Getachew said the Ministry of Transport would make "a preliminary report to its investigation" on the March 10 accident in which a Boeing 737 MAX to Nairobi 's destination crashed shortly after taking off from Addis Ababa.
The Government of Ethiopia has not provided any details on the exact timing of the publication or any indication of the findings of the report.
Nebiat initially announced that the report would be released on Monday, but the Ministry of Transport, in charge of investigations, said it would not last yet.
"The report will likely be released in the day this week," said ministry spokesman Mussie Yiheyes.
On Monday, it was not clear whether the preliminary report of the Ministry of Transport would be made public immediately or limited to the authorities, including the FAA.
The French airline safety agency BEA examines the black boxes of the plane and collaborates with American and Ethiopian investigators to determine what is wrong.
Anti-stall system
An informed source of the investigation said that an anti-stall system, the Maneuvering Characteristic Enhancement System (MCAS), had been activated shortly before the accident.
Boeing has designed the automated MCAS system – which lowers the nose of the aircraft when it detects a stall or a loss of speed – for this particular model.
The same system was involved in the plane crash of October. The first investigations had revealed that an aircraft sensor had transmitted incorrect information to the MCAS system.
According to the flight data recorder, pilots of Flight 610 from Lion Air struggled to control the plane while the MCAS repeatedly repelled the nose of the aircraft.
The pilot had repeatedly tried to regain control of his position and pull his nose up, but the plane had crashed into the sea.
Both Indonesian and Ethiopian planes reported steep and irregular climbs and descents, as well as variable speeds, before crashing shortly after take-off.
Ethiopia has already said that there are "obvious similarities" between the two MAX 8 accidents.
Ethiopian Airlines is the largest African carrier and, in many ways, the international face of the country.
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