The family of a Rwandan citizen who died in the Boeing 737 MAX 8 accident at Ethiopian Airlines, which killed 157 people on March 10, filed a lawsuit in Chicago against aeronautical manufacturer Boeing, Rwandan media reported on Saturday.

The family of Jackson Musoni, who was among the UN employees who were aboard the Boeing that crashed south-east of Addis Ababa just minutes after takeoff, accuses the American manufacturer of having designed a MCAS anti-stall system defective.

“There was a reconfiguration of the aircraft, which means that the engines were advanced (…), undoubtedly changing the shape of the fuselage and ultimately altering aerodynamics,” Steven Marks told the press, Jackson Musoni’s family advisor, quoted by the media.

The complaint was filed in a Chicago court by Podhurst Orsek on behalf of Jackson Musoni’s family.

The fleet of 737 MAX, 8 and 9, has been grounded since mid-March after the crash of Ethiopian Airlines, the second drama involving this aircraft in less than five months.

Last October, a 737 MAX 8 from Lion Air crashed in Indonesia, killing 189 people.