Incident Overview
On December 12, 1982, an aircraft departed from Savoonga on a flight bound for Nome, Alaska. Shortly after departure, the pilot observed a problem with the left engine and decided to divert to Gambell, Alaska. During the flight to Gambell, the pilot noted a gradual loss of oil pressure in the left engine.
Landing and Inspection
After landing at Gambell, the pilot discovered that the oil filler cap was missing and found no indication of oil on the dipstick. A mechanic subsequently added 7 quarts of oil to the engine. An oil cap from another vehicle was obtained and placed on the oil filler neck, secured with duct tape and safety wire. The engine was operationally checked and reported to have no discrepancies.
Subsequent Flight and Icing Conditions
The pilot then took off and attempted to file an IFR flight plan. However, the aircraft encountered freezing rain, prompting the pilot to decide to return to Gambell. During the return flight, the pilot noticed that the left engine oil pressure was again dropping. The left engine was shut down. Following the shutdown, ice began accumulating on the windshield and right windows.
Landing Incident
As the aircraft touched down, it was approximately 25° left of the runway heading. It subsequently struck a gravel and snow berm beside the runway. Post-incident examination revealed that the No. 1 cylinder had no compression, and a hole was found in the piston.
Findings
No official probable cause was stated in the investigation source.