On December 20, 1995, a Hughes 369D (registration N8395F) operated by Air, Inc. was involved in an aviation accident near Feather Falls, CA. Investigators recorded the probable cause as: the pilot's failure to jettison his external load after it came in contact with trees and terrain. The pilot's failure to maintain altitude/clearance above trees and hilly terrain was a related factor. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter conducting external load operations encountered a sling load collision with trees and terrain, leading to oscillations and a flat spin. The aircraft was found with the belly hook still engaged.
Overview
A helicopter engaged in external load operations was orbiting east of a logging pickup site when the sling load contacted trees and terrain near a ridge. Weather conditions at the time were clear with light winds.
Sequence of Events
During the operation, the helicopter was observed shaking and oscillating, followed by a flat spin. The sling line remained visibly attached throughout the incident. A radio call inquiring about the situation received no reply.
Findings
Upon reaching the accident site, first responders found the belly hook and line still engaged. Evidence of freshly broken tree limbs and branches was discovered along the flight path. Deposits of woody debris were noted on sections of the lines and load. No discrepancies were found with the belly hook.
No further details have been released regarding the aircraft or occupants.