Accident Sequence
The pilot leaned the mixture and departed on Runway 30, a high altitude dirt strip with a 3.8% uphill gradient. Winds were from the north-northwest at about 14 knots. At approximately 200 to 300 feet above ground level, the engine began to lose power. The aircraft settled and subsequently crashed on rocky terrain as the pilot was maneuvering to avoid trees. A post-crash fire consumed the aircraft.
Engine Examination
A teardown of the Marvel-Schebler MA4-SPA carburetor revealed several anomalies. The composite float was deteriorated, part of the float toe was missing, and the needle valve was stuck. The valve and seat were covered with a soft, sticky substance. Additionally, the inlet filter screen was almost entirely blocked by foreign debris.
Aircraft Information
An Supplemental Type Certificate had been issued for N9496D, which allowed the use of auto fuel.