Boeing says the changes will ensure that the simulator experience is representative across different flight conditions and will improve the simulation of force loads on the manual trim wheel that helps control the airplane.
The Russian Aeroflot passenger plane made an emergency landing at Moscow's Sheremetyevo airport and caught fire for unknown reasons.
Tensions between US and Turkey have worsened in recent months with Turkey set to begin receiving the S-400 Russian surface-to-air missile system, which the US says will jeopardise Ankara's role in the F-35 fighter jet programme.
Muilenburg said Boeing followed the same design and certification process it has always used and denied that the MAX was rushed to market. He said he would not resign, and left a press conference as reporters peppered him with questions.
The aviation giant announced on Wednesday it has suffered $1 billion after two deadly Boeing 737 MAX crashes. The company officials said they need to win back consumers' trust again.
Boeing has been under scrutiny following a March 10 Ethiopian Airlines crash of a 737 MAX that killed 157 people, the second deadly crash involving in the aircraft in five months.
Boeing announced it would cut the production of its 737 aircraft line following the two recent crashes that have seen the 737 MAX grounded worldwide.
A preliminary report issued by the Ethiopian transport ministry cast further doubt on the system controlling the Boeing 737 MAX 8 model, which has been grounded worldwide since almost a month.
Family of Jackson Musoni, a citizen of Rwanda who died in the Ethiopian Airlines 737 MAX crash, file a lawsuit against Boeing Co in US federal court.
Boing said it was updating software to address how the aircraft's flight control system MCAS (Maneuvering Characteristics Augmentation System) responds to erroneous sensor inputs.
Ethiopia's transport minister Dagmawit Moges says analysis of data from Boeing 737 MAX 8 black boxes show 'clear similarities' with October's Lion Air crash. Meanwhile, funerals were held for Ethiopia crash victims with little to bury.
Berlin is “losing its commercial credibility” over its ban on arms sales to Saudi Arabia and the move is affecting Europe’s “defence industry and ability to fulfill NATO requirements.”
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