"Within this one year we'll analyse whether other problems are existing on this aircraft", he said.
"Expressing sadness for the loss of the 346 lives claimed by the two accidents, Muilenburg said he could not remember "a more heart-wrenching time" at his career at Boeing" and said the company knew lives depended on the work it did.
Boeing is now working on a software update for the 737 Max's control system that will dial back the intrusiveness of MCAS.
The crash of a Lion Air plane in Indonesia last October that killed all 189 people on board and the crash in Ethiopia have left the world's largest planemaker in crisis as its top-selling jetliner is grounded worldwide.
Ethiopia's insistence that its pilots followed procedures when their Boeing Co 737 MAX nosedived before a deadly crash, and Boeing's recent declaration that a new software fix makes a "safe plane safer", have set the stage for a lengthy fight over the roles of technology and crew in recent 737 MAX crashes.
In each case, preliminary reports say faulty sensor readings erroneously triggered an anti-stall system that pushed the plane's nose down.
Three times the captain, Yared Getachew, cried "pull up", before the Boeing plane plunged into a field six minutes after takeoff from Addis Ababa, killing all 157 passengers and crew, said the report by Ethiopian investigators. 737 Max wasn't about to stall.
Federal Aviation Administration and customers to develop and release a software update to the MCAS, along with an associated comprehensive pilot training and supplementary program for the 737 Max, according to Muilenburg.
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To the city's advantage, the threshold for proving he staged the incident will be lower than in criminal court. But she hasn't detailed any action she might take as mayor regarding Smollett.
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Most of the documents were provided, however, and Harriett Miers, the former White House counsel under President George W. Barr submitted to Congress last month his summary of the findings of Mueller's report.
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Ariana dropped the single in celebration of her chart-soaring hit 7 Rings remaining at the top of the billboards for weeks. In her response to the Manchester Pride criticism, Grande said: "Also i wanna visit a city that means so much to me".
U.S. regulators this week demanded further improvements to a proposed fix before it could be submitted for review and announced a review of the certification of the automated flight control system on the 737 Max. On Monday, an FAA spokesman said the agency instead expected to receive the final package of software "over the coming weeks".
He acknowledged that the MCAS could cause pilots to lose control of an aircraft in response to erroneous data from the plane's external sensors.
"Those should literally follow each other", said one US -based expert, speaking on condition of anonymity because of the sensitivity of the matter.
The combination of excess speed and cutting off the system while the plane was still leaning downwards meant up to 50 pounds of force would be needed to move the control column, and moving the manual trim wheels was impossible. "We own it and we know how to do it", he said in a statement issued on Thursday.
Boeing declined to comment directly on the lawsuit, but said it's cooperating fully with investigating authorities.
Every plane crash typically involves multiple contributors, and the detailed Ethiopian report chronicles many factors that occurred over a matter of minutes leading to the accident.
But if the aircraft is going too fast, those electronic switches may not be effective, European regulators said in a 2016 memo.