Engine Valve Failure Causes Runway Excursion After Takeoff

Casualties unknown • Las Cruces, NM, US

A pilot experienced engine power loss shortly after takeoff, forcing an emergency landing. The aircraft skidded off the runway due to a burnt intake valve.

What happened

The pilot reported that shortly after departing from runway 26, he noticed the engine was not producing sufficient power. In response to this mechanical issue, he executed a 180-degree turn and attempted to land on runway 8. During the landing roll, he estimated a tailwind velocity of approximately 5 knots. The pilot lost directional control of the aircraft, causing it to skid to the left and depart the paved surface.

The investigation

Following the incident, the engine was removed and disassembled for a detailed examination. Mechanics discovered that the number 6 intake valve was burnt and failing to seat properly. This mechanical defect was identified as the direct cause of the power loss experienced during flight.

Findings

The primary factor contributing to the accident was the fuel system component failure, specifically the burnt intake valve which led to inadequate engine performance. The pilot's inability to maintain directional control resulted in the aircraft leaving the runway and sustaining damage to the right rear spar.

Probable cause

The pilot's failure to maintain directional control during the landing roll, which resulted in the aircraft skidding off the runway. Contributing to the incident was a mechanical malfunction involving the number 6 intake valve, which was burnt and not seating properly, leading to a loss of engine power.

Frequently asked questions

What happened in the 2000-03-24 Stinson 108-2 accident near Las Cruces, NM?

A pilot experienced engine power loss shortly after takeoff, forcing an emergency landing. The aircraft skidded off the runway due to a burnt intake valve.

What aircraft was involved and where did it happen?

The accident on 2000-03-24 involved a Stinson 108-2, registration N442C, at Las Cruces, NM.

What was the probable cause of the accident?

The pilot's failure to maintain directional control during the landing roll, which resulted in the aircraft skidding off the runway. Contributing to the incident was a mechanical malfunction involving the number 6 intake valve, which was burnt and not seating properly, leading to a loss of engine power.

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