Robinson R44 near Nuiqsut, AK — 2019-09-06

Probable cause

The pilot's improper decision to land downwind from unsecured debris, which resulted in the helicopter’s main rotor disk ingesting foreign objects.

NTSB narrative

The pilot reported that he landed the helicopter facing south and about 90 ft from where ground personnel were unhooking super sacks filled with gravel. When the skids touched down, the pilot reduced the collective and then saw an empty super sack about 15 ft away, which subsequently struck the main rotor toward the outboard portion of the blade. The super sack was ingested by the advancing side of the main rotor disk. The pilot rolled off the throttle and shut down the engine. The helicopter sustained substantial damage to the main rotor blades. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.

NTSB coding

• Prop/jet/rotor blast/suction · Landing
• Decision Making / Judgment

Evidence available

• Photos
• 2 docket documents

Docket documents2

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Photophotos

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