What happened
The accident occurred while the pilot was conducting a reduced power descending spiral maneuver. During this phase of flight, the pilot did not utilize carburetor heat. Upon applying throttle to recover or maintain altitude, the engine failed to respond as expected. Consequently, the pilot initiated a forced landing. During the descent for this landing, the aircraft collided with power lines that were not visible to the pilot.
The investigation
Examination of the environmental conditions at the time of the accident revealed that both the surface temperature and the dew point near the accident site fell within a range conducive to carburetor icing. This meteorological data supports the likelihood of ice accumulation in the engine's intake system despite the lack of anti-icing measures.
Findings
The sequence of events indicates that carburetor icing was the primary factor leading to the loss of engine power. The combination of a low-power descent without carburetor heat application created ideal conditions for ice formation. This mechanical failure necessitated an emergency landing, during which power lines became a critical hazard due to visibility issues or situational awareness challenges.
Safety message
Pilots must be vigilant regarding carburetor icing risks, particularly during descent phases where power settings are reduced. Regular application of carburetor heat is essential even when icing conditions appear mild, as temperature and dew point differentials can still facilitate ice accumulation.