20080226836369A

(-23) Propeller tear down analysis revealed that the rear bushing, through which the propeller pitch control rod passed, which is part of a rear hub assembly repair, was dislodged and contained within the rear of the hub. The adhesive that was placed on the rear bushing to help hold it in place in the hub assembly was found to have not adhered to the outside diameter of the bushing. Also found during the tear down analysis was that the propeller pitch control rod was loose and appeared to have not been properly torqued to the 40 PSI required. It is determined that the dislodged bushing and improperly torqued propeller pitch control rod were casual in the pilot's eventually losing control of propeller RPM. And ustimately, the loss of thrust when the propeller decreased below the designed 12 degrees pitch stop where it should have normally remained when all the oil was lost int the front portion of the propeller hub assembly. This is supported by both pilot's statements that the propeller RPM went to the max reading on the engine tachometer even with the slightest application of throttle indicating no propeller load as some would have been evident had the blade stopped at the low pitch stop of 12 degrees.