Western Aviators

Swearingen SA26T Merlin II

The pilot of the air ambulance feathered the right propeller after reporting 'a bit of a problem' with the right engine. He attempted to divert to the nearest suitable airport, but after receiving its latest weather report, elected to return to base. The airplane made a left turn, reentered IMC, and impacted a mountainside on a magnetic heading of 092°. The heading to the airport of intended landing was 272°. The accident occurred during a snowstorm at night. All five occupants survived and were rescued the following afternoon. Thick grease on the right engine fuel control camshaft prevented a spring from returning the 3d cam to a lower altitude position. The cam was found struck on the shaft at a position equating to an altitude of approximately 15,000 feet. The fuel flow schedule for flight idle was below specifications. In addition, shroud material was found delaminated from the left engine second stage compressor housing.