Probable cause
The pilot's inadvertent dynamic rollover during takeoff.
NTSB analysis
The commercial pilot of the helicopter was transporting equipment in support of remote mining activities using a 100-foot long-line. During takeoff, and while preparing to lift the external sling load, he inadvertently allowed the helicopter to drift laterally to the right and the right skid struck the ground, resulting in a dynamic rollover. The helicopter continued to roll to the right, and the main rotor blades struck the ground.
The helicopter subsequently came to rest on its right side, sustaining substantial damage to the main rotor drive system, fuselage, and tail boom. The pilot sustained minor injuries, and reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
Text from the NTSB. Open the NTSB docket for ANC18CA056 for the full record.
Event
- Date
- Jul 25, 2018
- Type
- Accident
- Place
- Kobuk, Alaska
- Highest injury
- Minor
- Minor injuries
- 1
- Weather
- Visual (VMC)
- Light
- Day
Eurocopter AS 350 B3
- N-number
- N354LA
- Category
- Helicopter
- Year built
- 2000
- Damage
- Substantial
- Operating rule
- Part 133 (external load)
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.