Loose Oil Filter Downed Predator:

The investigation into the June 22 crash of a Predator unmanned aerial vehicle flying a training mission at Creech AFB, Nev., indicated that the UAV suffered rapid loss of engine oil because of a loose oil filter. A statement from Air Combat Command said the accident board believes a technician improperly aligned the oil filter, but it also noted that the design of the filter itself contributed to the accident.