ANC24FA089
2024-09-07 · King Salmon, Alaska, United States · Fatal · 1 aircraft · Status: Completed
Current FAA registration · N306FW
- Make / Model
- BELL 206B
- Year of manufacture
- 1986 · 38 years old at event
- Engine
- ALLISON 250-C20 SER (420 hp)
- Seats / Engines
- 5 seats · 1 engine
- Last airworthiness date
- 19860514
- ADS-B equipped
- Yes — Mode-S A3362E
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot’s decision to initiate the visual flight into instrument meteorological conditions, which resulted in his spatial disorientation, failure to maintain helicopter control and subsequent impact with water.
Factual narrative
HISTORY OF FLIGHTOn September 7, 2024, about 0924 Alaska daylight time, a Bell 206B helicopter, N306FW, sustained substantial damage when it was involved in an accident near King Salmon, Alaska. A passenger was fatally injured; the pilot and three passengers sustained minor injuries. The helicopter was operated as a Title 14 Code of Federal Regulations Part 135 flight. The accident helicopter, owned and operated by Egli Air Haul, was transporting four passengers to a sport fishing camp located to the south of the King Salmon Airport (AKN). According to archived FAA data, the accident pilot contacted the AKN control tower specialist on duty to request a special visual flight rules (SVFR) clearance to depart to the south. The controller on duty issued the pilot a SVFR clearance and instructed the pilot to report clear of the Class D airspace to the south. The helicopter then departed to the south. Shortly after the helicopter departed, the control tower specialist received a phone call from an observer to the south of the airport indicating that a helicopter had just crashed into the Naknak River, near Grassy Point. The control tower specialist then attempted to reach the departing helicopter, but no further radio communications were received. The pilot reported encountering a very dense fog bank while flying over the calm water of the Naknek River; he subsequently lost all visual reference and became disoriented when he attempted to climb. The helicopter then descended and subsequently impacted the surface of the river. Witnesses reported that it was foggy at the airport before the helicopter departed. One witness, who was walking along the riverbank, reported that it was so foggy that she could not see the opposite side of the river. This witness saw the helicopter just before the impact and stated it was flying less the 100 ft above the water. WRECKAGE AND IMPACT INFORMATIONThe fuselage was intact with all major components still attached. The tail rotor blades, and gear box were undamaged. Cyclic and collective flight controls were traced from the cockpit controls to the pitch control rods attached to the main rotor hub assembly. Anti-torque control (yaw) was traced from the anti-torque pedals to the tail rotor with fractures consistent with impact damage at the bottom and top of the flight control “broom closet.” Tail rotor pitch control operated smoothly and freely. No damage was observed with the flight control hydraulic servos. All hoses were attached and undamaged. All fuel, oil, and electrical lines in the engine compartment were undamaged and connected. The fuel control unit was undamaged. Throttle control from the cockpit was traced to the fuel control unit. Rotational scoring was observed on the tail rotor drive shaft under the engine and on the input shaft to the K-flex. SURVIVAL ASPECTSThe passenger who was fatally injured was unable to exit the helicopter when the helicopter went under the water. The passenger was in the front left seat using a 4-point seatbelt restraint system. The commercial, instrument-rated pilot was departing under special visual flight rules clearance in instrument meteorological conditions. Shortly after takeoff the pilot encountered a dense fog bank while flying over the calm water of a river. He stated he attempted to turn around, but he lost his visual reference with the river. The pilot stated he then attempted to climb but became disoriented and a few seconds later the helicopter impacted the water. Examination of the airframe and engine revealed no evidence of any preaccident mechanical failures or malfunctions that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
FAA avdata. C = Cause, F = Factor.
- — Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Pilot
- — Environmental issues-Conditions/weather/phenomena-Ceiling/visibility/precip-Low visibility-Effect on personnel
- — Environmental issues-Conditions/weather/phenomena-Ceiling/visibility/precip-Below VFR minima-Effect on personnel
- — Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot
- — Personnel issues-Task performance-Use of equip/info-Use of equip/system-Pilot
- — Personnel issues-Psychological-Perception/orientation/illusion-Spatial disorientation-Pilot
- — Personnel issues-Psychological-Perception/orientation/illusion-Situational awareness-Pilot
- — Personnel issues-Psychological-Perception/orientation/illusion-Visual illusion/disorientation-Pilot
Verbatim from NTSB's published report. Source file
NTSB_2024_ANC24FA089.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Search this event elsewhere
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Related research
Matched on aircraft type or causal vocabulary (spatial disorientation). All research papers
- Embry-Riddle Scholarly Commons 2025 · Journal article (IJAAA) Design, Implementation, and Testing of Spatial Disorientation Scenarios in a Modified Hexapod Motion Simulator
Abstract Investigations into aviation accidents aim to identify root causes and enhance safety. Despite advancements in safety measures, technology, and education, general aviation accident rates rema…
- AOPA Air Safety Institute 2022 · Safety advisor Safety Advisor: Spatial Disorientation
Safety advisor on the perceptual illusions that cause spatial disorientation: the leans, graveyard spiral, somatogravic and somatogyral illusions, false horizon, and Coriolis.
- NASA NTRS 2019 · Conference Paper Evaluation of Low Cost, User-Centered Alerting Devices for the Mitigation of Flight Crew Spatial Disorientation
The National Aeronautics and Space Administration (NASA) is conducting research into technologies which have the potential to reduce flight crew Spatial Disorientation (SD).
- NASA NTRS 2019 · Presentation Pre-Flight Training of Autonomic Responses for Mitigating the Effects of Spatial Disorientation During Spaceflight
The National Aeronautics and Space Administration (NASA) has identified a potential risk of spatial disorientation, motion sickness, and degraded performance to astronauts during re-entry and landing …
- NASA NTRS 2019 · Other The Role of Spatial Disorientation in Fatal General Aviation Accidents
In-flight Spatial Disorientation (SD) in pilots is a serious threat to aviation safety. Indeed, SD may play a much larger role in aviation accidents than the approximate 6-8% reported by the National …
- NASA NTRS 2019 · Technical Memorandum (TM) Autogenic-Feedback Training Exercise (AFTE) Mitigates the Effects of Spatial Disorientation to Simulated Orion Spacecraft Re-Entry: Individual Differences
NASA has identified a potential risk of spatial disorientation to future astronauts during re-entry of the proposed Orion spacecraft.