What happened
During a flight phase involving maneuvering at a reduced power setting, the aircraft experienced a sudden loss of power. At this critical juncture, the pilot entered an inadvertent stall. The individual operating the controls was a student pilot who is legally deaf. To accommodate this disability, the aircraft was equipped with a visual stall warning system, specifically a red stall warning light, rather than relying solely on auditory cues. Despite these provisions, the stall condition developed, and the aircraft subsequently descended into a wooded area.
The investigation
Investigative efforts focused on determining the root cause of the initial power loss. Examinations were conducted to assess the mechanical integrity of the engine and associated systems. However, investigators were unable to identify a specific mechanical failure or external factor that caused the engine to stop functioning. The reason for the engine failure could not be determined from the available evidence.
Findings
The sequence of events began with a loss of power during maneuvering flight. This was followed by an inadvertent stall entry. The pilot's hearing impairment necessitated reliance on visual warnings, which were present in the cockpit. Ultimately, the aircraft impacted trees following the descent.
Safety message
This incident highlights the complexities of operating aircraft with sensory impairments. While visual warning systems are available to supplement auditory cues, pilots must ensure they can effectively monitor all flight parameters during critical phases such as maneuvering and low-power operations.