Executive/Corporate/Business

An examination of the right aileron showed it to be broken at the center hinge point where the aileron control tube attaches. The rivets holding the fittings to which this tube attaches were wrenched out and one fitting was broken. The other end of the control tube, which attaches to the aileron bell crank through a ball bearing, was detached. The inner race of the ball bearing was still attached to the bolt in the bell crank but the outer race was missing. Apparently this outer race or the method of holding it in place had failed, allowing the tube to drop down and thus disconnect the right aileron control system. Failure an flight of the system controlling either the right or the left aileron would allow that aileron to flutter and thus set up a force sufficient to destroy the wing. It is the opinion of the Bureau of Air Commerce that the probable cause of the accident was a failure of the right aileron control system which resulted in a major failure of the right wing.

It is the opinion of the Accident Board that the probable cause of this accident was poor judgment on the part of the pilot for attempting this flight under weather conditions which existed at the time and for continuing flight up a canyon until engulfed in fog which could have been avoided and for attempting a turn in a canyon so narrow that there was not a reasonable expectancy of being able to complete the turn.