A Fedex Federal Express McDonnell Douglas DC-10-30 freighter, registration N313FE performing flight FX-841 from Ontario,CA to Memphis,TN (USA) with 3 crew, was enroute at FL350 about 15nm south of Oklahoma City,OK (USA) when the crew declared emergency reporting a bleed air malfunction affecting their de-icing systems with a large frontal system east of Oklahoma City ahead on their planned route. Oklahoma Airport reported a previously landing aircraft did not report any icing conditions. The crew decided to divert to Oklahoma City and landed safely on runway 17R about 20 minutes after declaring emergency. The crew requested emergency services to inspect the aircraft for any damage.
The aircraft remained on the ground for about 2:15 hours, then continued to Memphis flying around the frontal system initially to the west and turning far south and reached the destination with a delay of about 4 hours.