de Havilland Canada DHC-2 Beaver Mk I (L-20A), N4957, accident occurred on June 10, 2024, near Port Alsworth, Alaska

• Location: Port Alsworth, Alaska 
• Accident Number: ANC24LA049 
• Date & Time: June 10, 2024, 16:35 Local 
• Registration: N4957 
• Aircraft: DEHAVILLAND BEAVER L-20A (DHC-2) 
• Aircraft Damage: Substantial 
• Defining Event: Unknown or undetermined 
• Injuries: 1 Serious, 5 None 
• Flight Conducted Under: Part 91: General aviation - Other work use 

https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194439/pdf

https://data.ntsb.gov/Docket?ProjectID=194439

On June 10, 2024, about 1635 Alaska daylight time, a float-equipped DeHavilland DHC-2 airplane, N4957, was substantially damaged when it was involved in an accident near Port Alsworth, Alaska. The pilot and four passengers were not injured, and one passenger sustained minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 business flight.

The pilot and five passengers departed from a remote lake in the float-equipped airplane. The pilot reported that, shortly after takeoff, he felt the manifold pressure decrease, and he advanced the propeller and throttle controls. The engine initially responded with an increase in rpm and manifold pressure but subsequently lost total power. The pilot performed a forced landing into a heavily wooded area, and the airplane sustained substantial damage to the fuselage and wings.

A postaccident examination of the engine revealed no evidence of preimpact mechanical malfunctions or failures that would have precluded normal engine operation. Passengers reported that the pilot made an aggressive steep turn at low altitude with no change in engine noise from takeoff to impact with terrain. Based on available evidence, it is likely that the engine sustained a partial loss of engine power for reasons that could not be determined.

- Probable Cause: A partial loss of engine power for reasons that could not be determined.