No oil was visible in the gauge on the right engine’s oil reservoir after a February Delta Air Lines flight filled with smoke during takeoff at Atlanta’s Hartsfield Jackson International Airport, a preliminary report from the National Transportation Safety Board said Wednesday.

The National Transportation Safety Board released the preliminary report for a Delta Air Lines flight from Atlanta to Charleston that had to be evacuated after smoke filled the cabin.

Investigators found no oil in the right-side Rolls-Royce BR715-C1 engine of a Delta Air Lines Boeing 717 following an emergency landing in February that involved a "tremendous" amount of cabin smoke.