The Federal Aviation Administration (FAA) has released an emergency directive aimed at the owners and operators of Boeing’s McDonnell Douglas MD-11 and MD-11F cargo planes. This action follows a tragic crash in Kentucky that resulted in fatalities.

The crash occurred on Wednesday in Louisville, Kentucky, claiming the lives of at least 14 individuals. According to the directive, the “left-hand engine and pylon detached from the aircraft during takeoff,” prompting a ban on further flights until thorough inspections are conducted and any necessary repairs are made.

The exact cause of the engine detachment remains under investigation. However, air traffic regulators have issued this directive amid concerns that the same issue could potentially affect other planes of the same model.

The FAA considers this directive a temporary precautionary measure. Depending on the findings, the agency may implement more permanent rules in the future.

In response, UPS has proactively grounded its entire fleet of MD-11 aircraft.

“MD-11s are approximately 9% of the UPS Airlines fleet. The grounding is effective immediately. We made this decision proactively at the recommendation of the aircraft manufacturer. Nothing is more important to us than the safety of our employees and the communities we serve,” the company wrote in a statement.

“Contingency plans are in place to ensure we can continue to deliver the reliable service our customers around the world count on,” UPS added.

FedEx confirmed with The Hill that it was also grounding its own MD-11 fleet while it conducts “a thorough safety review based on the recommendation of the manufacturer.”