Aircraft impact following loss of control

No fatalities • Boise, United States of America • Landing (descent or approach)

A private flight ended in a terrain impact after the aircraft was observed flying at low altitudes with unusual engine sounds and erratic flight patterns.

What happened

During a personal flight, a commercial pilot was involved in an accident that resulted in an impact with the terrain. Witnesses near the airport observed the aircraft flying at an unusually low altitude. One observer, a former pilot, noted that the engines appeared to be out of sync. Another witness, located approximately five miles from the airfield, reported hearing loud popping and banging noises coming from the engines as the plane passed overhead.

A third witness, positioned at the runway holding area, observed the aircraft approaching the runway at roughly 75 feet above ground level. The aircraft was seen descending to 50 feet before climbing back to 75 feet, at which point it executed a sharp right turn and struck the ground. The pilot stated in a later written report that the rudder and torque tubes became immobile following the crash, noting that several rivets had sheared from the left rudder pedal.

Findings

Post-accident inspections of both engines showed no evidence of mechanical malfunctions or failures that would have prevented standard operation. While witnesses described symptoms of engine distress, no mechanical cause was identified. Regarding the rudder, although the pilot suspected a structural failure, examination of the fractured rivets revealed deformation patterns consistent with overstress shearing caused by the forces of the impact itself. No anomalies were found in the rudder system prior to the accident, suggesting the pilot likely lost control of the aircraft during the flight sequence.

Probable cause

The pilot lost control of the aircraft during a low-altitude maneuver, potentially due to an unidentified engine issue.

Frequently asked questions

What happened in the 2015-09-21 Rockwell Grand Commander 680 accident near Boise, United States of America?

A private flight ended in a terrain impact after the aircraft was observed flying at low altitudes with unusual engine sounds and erratic flight patterns.

Were there any fatalities in the 2015-09-21 Rockwell Grand Commander 680 accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 2015-09-21 involved a Rockwell Grand Commander 680, registration N222JS, operated by James R. Metzger, at Boise, United States of America.

What was the probable cause of the accident?

The pilot lost control of the aircraft during a low-altitude maneuver, potentially due to an unidentified engine issue.

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