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Ethiopia air crash: Boeing to deploy 737 MAX software enhancement in few weeks

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Boeing says it will deploy a 737 MAX software “enhancement” across the fleet in the coming weeks incorporating feedback “received from our customers.”

According to the company, FAA will also mandate the change in an airworthiness directive (AD) “no later than April.”

The statement comes in the aftermath of two 737 MAX 8 crashes in less than five months involving Lion Air and Ethiopian Airlines aircraft. Since the March 10 crash of Ethiopian’s flight 302, a growing number of civil aviation authorities and airlines have grounded their MAX fleets.

United Kingdom and seventeen countries across the world have suspended Boeing’s 737 Max 8 planes from operating.

The U.K. Civil Aviation Authority said on Tuesday it banned all Boeing 737 MAX Aircraft planes from its airspace after the fatal Ethiopian Airlines crash that killed 157 people this weekend.

Britain’s aviation regulator has already taken action. In the absence of sufficient information from the Ethiopian Airlines plane’s flight-data recorder, the Civil Aviation Authority has issued instructions “to stop any commercial passenger flights from any operator arriving, departing or overflying U.K. airspace,” it said in a statement Tuesday.

Other countries that have grounded the aircraft include China, Germany, France, Mexico, Brazil, Argentina, Indonesia, Turkey, Ireland, Australia, Ethiopia, South Africa, Malaysia, Singapore, Oman, Morocco and Mongolia.

The Oct. 29 crash of Lion Air flight 610 appears to be linked to maintenance practices, erroneous speed data input to and pilot confusion about the handling of the maneuvering characteristics augmentation system (MCAS), a new flight control law introduced on the MAX.

But that investigation is ongoing and there is no indication so far that MCAS played a role in the March 10 Ethiopian accident. Both the flight data and cockpit voice recorder have been recovered from the Ethiopian aircraft wreckage, but data analysis has yet to take place.

FAA stated March 11 that “this investigation has just begun and to date we have not been provided data to draw any conclusions or take any actions.” The authority issued a Continued Airworthiness Notification to the International Community (CANIC).

According to Boeing, the enhancements include updates to “the MCAS flight control law, pilot displays, operation manuals and crew training. The enhanced flight control law incorporates angle of attack inputs, limits stabilizer trim commands in response to an erroneous angle of attack reading and provides a limit to the stabilizer command in order to retain elevator authority.”

Boeing said MCAS was initially introduced to improve handling characteristics and decrease pitch-up tendency “at elevated angles of attack” but not “in normal flight.” The company stressed in its statement that “the pilot will always be able to override the flight control law using electric trim or manual. In addition, it can be controlled through the use of the existing runaway stabilizer.

 

Ifeoma Okeke

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