Hawaiian Airlines flight HA3 had to return and make an emergency landing at Los Angeles International Airport, California, on May 18.
According to an airline spokesperson, the plane was en-route to Honolulu when the crew noticed a cockpit indicator light that showed an open fuel jettison valve. The captain then declared an emergency and turned back towards LAX.
The A330 plane landed uneventfully. There were 290 passengers and 10 crew members aboard at the time; all of them remained safe.
On landing, it was found that the valve was closed.