Accident Sequence
The pilot reported flying down a glacier for an extended period with the throttle at a low power setting and the carburetor heat off. As the aircraft approached the toe of the glacier, the pilot attempted to add power to level the airplane, but the engine did not respond. With altitude running out, the pilot executed a landing on the glacier moraine. During the landing, the airplane nosed over, causing substantial damage to the wings and fuselage.
Aircraft and Mechanical Condition
The pilot stated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation. The aircraft had not experienced any known issues prior to the flight.
Weather and Carburetor Icing Conditions
According to the recorded temperature and dew point at the time of the accident, the ambient conditions were favorable for serious carburetor icing at descent power. The combination of the low power setting and the environmental conditions created a high risk for ice formation in the carburetor, which can restrict airflow and cause engine power loss.
Pilot Actions
The pilot did not complete and submit NTSB Form 6120.1, which is the official accident report form. The reason for this omission is not specified in the source.