Mesa, AZ, USA
N97AZ
Bell 206B
The helicopter experienced a dynamic rollover and impacted terrain during an attempted takeoff from a parked trailer. A pilot acquaintance of the pilot described the trailer as a modified boat trailer, with an open and trough-shaped platform surrounded by "D" shaped tie down rings, which the acquaintance did not think was suitable for safe takeoff and landing operations. Earlier in the day, the pilot made several unsuccessful attempts to land the helicopter on the recently purchased trailer, and opted to land on the runway surface next to the trailer. After obtaining fuel, the pilot decided to make an additional attempt to land on the trailer in the dark night conditions. Witnesses saw the helicopter land on the trailer. Shortly after touchdown, the pilot attempted to depart the trailer platform and as the helicopter lifted off, the left skid caught on one of the numerous "D" shaped rings affixed to the platform surface of the trailer. The helicopter experienced a dynamic rollover and collided with the ground.
"THIS CASE WAS MODIFIED JUNE 4, 2008." On June 24, 2004, about 2110 mountain standard time, a Bell 206B, N97AZ, experienced a dynamic rollover and impacted terrain during an attempted takeoff from a trailer parked at the Falcon Field Airport, Mesa, Arizona. The pilot was operating the helicopter under the provisions of 14 CFR Part 91. The certified flight instructor pilot, the sole occupant, was fatally injured and the helicopter was substantially damaged. Visual meteorological conditions prevailed, and a flight plan had not been filed. The personal local flight originated from Falcon Field Airport about 2105. In a written statement, a friend of the pilot reported that upon arriving at the airport, he observed the pilot land the helicopter adjacent to a trailer. After the helicopter was shutdown, he engaged in conversation with the pilot, who informed him that he was intending to practice landings on his recently purchased transport trailer that night. The pilot stated that his earlier attempts to land the helicopter on the trailer were unsuccessful, which he attributed to the helicopter's weight distribution. Specifically, he thought that the center of gravity was too far aft due to the low fuel level, which was making it difficult to maintain the appropriate hover configurations. The pilot added that he intended to obtain fuel, and make another attempt to land the helicopter on the trailer. During a telephone interview with a National Transportation Safety Board investigator, the friend of the pilot further added that the pilot had recently purchased the trailer, and was not experienced at maneuvering the helicopter onto it. He described the trailer as a modified boat trailer, with an open and trough-shaped platform, which he did not think was suitable for safe takeoff and landing operations. He opined that during the accident sequence the helicopter's left skid caught on one of the numerous "D" shaped rings affixed to the platform surface. He added that at the time of the accident sky conditions were dark. In a written statement, an air traffic control specialist reported that he observed the pilot make three or four unsuccessful attempts at landing the helicopter on the transport trailer about 45 minutes prior to the accident. In statements collected by the Mesa Police Department, witnesses reported observing the helicopter land on the trailer. As the helicopter began to liftoff the trailer surface, the left skid caught on the trailer, resulting in a dynamic rollover and collision with the ground.
the pilot's failure to adequately clear the left skid of obstacles resulting in a dynamic rollover of the helicopter and collision with terrain. A factor in the accident was the dark nighttime lighting conditions.
Source: NTSB Aviation Accident Database
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