A wrongful death lawsuit was filed against Boeing in a U.S. federal court Thursday in what appears to be the first litigation over the fatal crash of Ethiopian Airlines Flight 302 earlier this month, Reuters reports.

The case was brought by the family of Jackson Musoni, a 31-year-old Rwandan national who was among at least 22 U.N. workers killed in the March 10 tragedy.

The suit alleges that Boeing’s 737 MAX aircraft had a defectively designed automated flight control system and that Boeing failed to warn pilots about the allegedly faulty sensors. The ill-fated Flight 302 lost control minutes after takeoff from Ethiopia capital’s Addis Adaba and the crash killed all 157 people on board.

Following the crash, dozens of countries and airlines grounded the 737 MAX. The same aircraft was involved in Indonesian carrier Lion Air’s wreckage last October, which killed 189 people.

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