SUPAI, AZ, USA
N90144
Bell 206B
The helicopter was was being used in an external lift operation, moving supplies of salt to a storage location. The pilot reported that he was lifting to a hover over a loaded cargo net, unaware that the external load cable was draped over one of the skids. As the cable took the strain of the load, the helicopter rolled, and the lateral control limit was exceeded. The pilot released the load with an electrical switch; however, before control was regained, the helicopter contacted the ground, nose low, and the main rotor blades struck the ground. The pilot reported that from initial down-force on the skid until impact, the time frame was less than 4 seconds. He also reported no mechanical malfunction with the helicopter.
On November 1, 1996, at 1230 hours mountain standard time, a Bell 206B helicopter, N90144, dynamically rolled over and crashed while lifting an external sling load from an uncharted mountainous helipad located near Supai, Arizona. The helicopter was owned and operated by Action Helo of Arizona, under 14 CFR Part 133 for the local flight. Visual meteorological conditions prevailed at the time of the accident and a company VFR flight plan had been filed for the operation. The helicopter was destroyed and property on the ground was damaged in the ensuing crash. The certificated commercial pilot, the sole occupant, sustained minor injuries. In his written accident report, the pilot said that "while lifting to a hover over a cargo net external load, the 40 foot cable became fouled over the skid (left-right unknown). Control limits were exceeded with an increasing roll rate. The load was released by the electrical switch but the helicopter contacted the ground nose low striking main rotors to the ground. From initial down-force on [the] skid to impact[, it] was less than perhaps four seconds." The pilot also reported that there were no mechanical malfunctions with the helicopter.
improper routing of the external cargo hoist cable (over helicopter skid), which resulted in lateral imbalance and roll-over of the helicopter, as weight on the cable became effective.
Source: NTSB Aviation Accident Database
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