Accident Overview
On November 27, 2014, at 1117 Alaska standard time, a Piper PA-18-150 airplane, registration N9720P, collided with terrain following a total loss of engine power while maneuvering for an off-airport landing near Nikiski, Alaska. The aircraft was registered to Summit Leasing LLC and operated by Alaska West Air, Inc. under 14 CFR Part 135 as an on-demand commercial air taxi flight. Visual meteorological conditions prevailed, and a company flight plan was filed. The flight originated from Kenai, Alaska approximately 1030.
Pilot Actions
The pilot reported that before the accident, he flew 20 to 30 minutes surveying the area for possible landing sites. During this time, he applied carburetor heat three or four times to check for carburetor ice. After selecting a landing site, he completed the pre-landing checklist and placed the carburetor heat in the off position. On short final, the engine lost all power. The pilot then switched fuel tanks and turned the carburetor heat back on, but the engine did not restart. The airplane subsequently collided with rising terrain just short of the intended landing site, sustaining substantial damage to the fuselage and wings.
Post-Accident Examination
On December 1, 2014, NTSB investigators performed an examination of the airframe and engine. Control cable continuity was established from the cockpit controls to the engine for throttle, mixture, carburetor heat, and cabin heat. A follow-up examination on December 11 focused on the engine and fuel system. No anomalies, contamination, or evidence of malfunction were found in any engine accessories. The cylinders, pistons, valve train, crankshaft, and other internal components showed no evidence of anomaly or malfunction that would have precluded normal operation. Both magnetos were tested; when the coupling was rotated, a blue spark was produced from each terminal in rotational order.
Meteorological Conditions
The closest weather reporting facility, Kenai Airport, about 31 miles southeast of the accident site, reported at 1053: wind from 010 degrees at 3 knots, clear sky, visibility 10 statute miles, temperature 10°F, dewpoint 9°F, barometric pressure 30.23 inHg. According to a carburetor icing probability chart, an airplane operating in the ambient conditions at the accident site could expect light carburetor icing while at cruise or glide power.
Other Pilot Observations
Another pilot employed by the same company, who had landed at the same location minutes before the accident aircraft approached, stated that during the descent, his aircraft had accumulated carburetor ice during the approach.
Damage and Injuries
The pilot, a certificated commercial pilot, sustained serious injuries. The sole passenger sustained minor injuries. The aircraft sustained substantial damage to the fuselage and wings.