(Bloomberg) -- U.S. aviation regulators are proposing fixes to some Boeing Co. 777 jets to prevent engine debris from escaping after a mechanical failure and endangering passengers as happened on three recent incidents.

The Federal Aviation Administration on Wednesday filed a pair of proposed directives in the Federal Register that would require strengthening the engine inlets and adding shielding on Pratt & Whitney engines used on 777-200 and 777-300 aircraft.

The smooth inlet at the front of an engine on a United Airlines 777-200 broke apart on Feb. 20 after departing Denver International Airport, spraying the plane with shrapnel. The FAA had announced earlier this year that it was working with Boeing to develop fixes to the plane. 

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