What happened
The pilot initiated departure from an uphill runway configuration while encountering a tailwind component. The aircraft was loaded near its maximum gross weight limit and operated in conditions characterized by high density altitude, which significantly degraded performance capabilities. The start of the flight sequence was delayed, contributing to the operational timeline.
During pre-flight or startup checks, an excessive magneto drop was detected. This anomaly was diagnosed as being caused by a fouled spark plug, indicating a maintenance issue that could affect engine power output. Additionally, the pilot reported experiencing significant mental stress at the time of the operation.
The aircraft became airborne but failed to gain altitude effectively. It slowly lost height and impacted the ground approximately one mile from the airport. The collision resulted in severe structural damage, with both wings being demolished upon impact.
The investigation
Investigation into the mechanical state of the aircraft identified a fouled spark plug as the cause of the excessive magneto drop. This maintenance defect was noted alongside the operational constraints of high density altitude and heavy weight.
Findings
Contributing factors to this accident included the pilot's decision to operate the aircraft under adverse performance conditions, specifically high density altitude combined with a near gross weight load and an uphill departure path. The presence of a tailwind further reduced takeoff performance margins. Additionally, the mechanical condition of the engine, indicated by the fouled plug, may have compromised power availability during the critical climb phase.
Safety message
Pilots must carefully calculate takeoff performance data for density altitude, weight, and runway slope before departure. Ignoring these limitations can lead to an inability to clear obstacles or maintain safe flight paths after liftoff.