# NTSB investigations, AK: Unknown or undetermined

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB ANC26FA106](https://openairdocs.org/ntsb/ANC26FA106.md): Piper PA-18-150 · Northway, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Sep 18, 2026 · N9128D · Substantial damage
  > On September 17, 2026, about 1930 Alaska daylight time, a Piper PA-18-150 airplane, N9128D, was substantially damaged when it was involved in an accident near Northway, Alaska. The pilot and passenger were fatally injured. The airplane was operated as a Title…
- [NTSB ANC26FA105](https://openairdocs.org/ntsb/ANC26FA105.md): Cessna A185F · Stony River, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Sep 15, 2026 · N4358Q · Substantial damage
  > On September 15, 2026 about 1210 Alaska daylight time, a Cessna A185F airplane, N4358Q, was substantially damaged when it was involved in an accident near Stony River, Alaska. The pilot and passenger were fatally injured. The airplane was operated as a Title…
- [NTSB WPR26FA309](https://openairdocs.org/ntsb/WPR26FA309.md): Cessna 441 · Cape Newenham, AK · Accident · 8 fatal · Class 3 · Field · Preliminary report · Aug 20, 2026 · N128EZ · Destroyed
  > On August 20, 2026, at about 1145 Alaska daylight time, a Cessna 441, N128EZ, was destroyed when it was involved in an accident near Cape Newenham, Alaska. The two pilots and six passengers were fatally injured. The airplane was operated as a Title 14 Code of…
- [NTSB ANC26FA077](https://openairdocs.org/ntsb/ANC26FA077.md): Piper PA22 · Chitina, AK · Accident · 3 fatal · Class 3 · Field · Preliminary report · Jul 28, 2026 · N4535A · Destroyed
  > On July 27, 2026, about 2130 Alaska daylight time, a deregistered Piper PA-22-150 airplane, N4535A, was destroyed when it was involved in an accident near Chitina, Alaska. The pilot and two passengers were fatally injured. The airplane was operated as a Title…
- [NTSB ANC26LA071](https://openairdocs.org/ntsb/ANC26LA071.md): Bellanca 7GCBC · Skwentna, AK · Accident · Serious injuries · Class 4 · Limited · Investigation open · Jul 11, 2026 · N11647 · Substantial damage
- [NTSB ANC25LA121](https://openairdocs.org/ntsb/ANC25LA121.md): Maule M-4-210C · Lime Village, AK · Accident · No injuries · Class 4 · Limited · Final report · Sep 18, 2025 · N4612T · Substantial damage
  > A collision with terrain during takeoff.
- [NTSB ANC25FA044](https://openairdocs.org/ntsb/ANC25FA044.md): Robinson Helicopter R66 · Kaparuk, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Jun 4, 2025 · N962MD · Substantial damage
  > On June 4, 2025 about 1055 Alaska daylight time, a Robinson R66 turbine-powered helicopter, N962MD, was substantially damaged when it was involved in an accident near Kaparuk, Alaska. The pilot and passenger were fatally injured. The helicopter was operated…
- [NTSB ANC25FA035](https://openairdocs.org/ntsb/ANC25FA035.md): Cessna T207 · Nanwalek, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Apr 28, 2025 · N91025 · Substantial damage
  > On April 28, 2025, about 1355 Alaska daylight time, a Cessna T207 airplane, N91025, was substantially damaged when it was involved in an accident near Nanwalek, Alaska. The pilot and one passenger were fatally injured. One passenger was seriously injured. The…
- [NTSB ANC25LA019](https://openairdocs.org/ntsb/ANC25LA019.md): Piper PA-18-150 · Wasilla, AK · Accident · No injuries · Class 3 · Limited · Final report · Feb 21, 2025 · N2447J · Substantial damage
  > A total loss of engine power for undetermined reasons.
- [NTSB ANC24FA091](https://openairdocs.org/ntsb/ANC24FA091.md): Champion 7GCBC · Ninilchik, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Sep 13, 2024 · N8CK · Substantial damage
  > On September 13, 2024, about 0803 Alaska daylight time (AKDT), a Champion (Citabria) 7GCBC, N8CK, was substantially damaged when it was involved in an accident near Ninilchik, Alaska. The pilot and passenger were fatally injured. The airplane was operated as…
- [NTSB ANC24LA073](https://openairdocs.org/ntsb/ANC24LA073.md): De Havilland DHC2 · Anchorage, AK · Accident · No injuries · Class 3 · Limited · Final report · Aug 2, 2024 · N4444Z · Substantial damage
  > A partial loss of power during takeoff climb for undetermined reasons.
- [NTSB ANC24LA064](https://openairdocs.org/ntsb/ANC24LA064.md): Dehavilland DHC-2T · Petersville, AK · Accident · No injuries · Class 3 · Limited · Final report · Jul 13, 2024 · N535KT · Substantial damage
  > An in-flight loss of thrust due to an uncommanded feathering of the propeller for reasons that could not be determined.
- [NTSB ANC24FA052](https://openairdocs.org/ntsb/ANC24FA052.md): Piper PA-18-150 · Moose Pass, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Jun 18, 2024 · N645DT · Substantial damage
  > On June 18, 2024, about 1400 Alaska daylight time, a float-equipped Piper PA-18-150 airplane, N645DT, was substantially damaged when it was involved in an accident near Moose Pass, Alaska. The instructor pilot and the pilot receiving instruction were fatally…
- [NTSB ANC24LA049](https://openairdocs.org/ntsb/ANC24LA049.md): Dehavilland Beaver L-20A (DHC-2) · Port Alsworth, AK · Accident · Serious injuries · Class 3 · Limited · Final report · Jun 11, 2024 · N4957 · Substantial damage
  > A partial loss of engine power for reasons that could not be determined.
- [NTSB ANC24FA029](https://openairdocs.org/ntsb/ANC24FA029.md): Douglas C54D · Fairbanks, AK · Accident · 2 fatal · Class 3 · Field · Final report · Apr 23, 2024 · N3054V · Destroyed
  > A loss of power of the No. 1 engine for reasons that could not be determined, and the incorrect installation of a B-nut fitting in the propeller feathering system, which allowed engine oil to spray onto the exhaust system when the propeller was feathered…
- [NTSB ANC24FA008](https://openairdocs.org/ntsb/ANC24FA008.md): Piper PA-18-150 · Anchor Point, AK · Accident · 2 fatal · Class 3 · Field · Final report · Dec 8, 2023 · N1880P · Destroyed
  > An impact to the left wing, at an undetermined time, for reasons that could not be determined, which partially separated the left wing and rendered the airplane uncontrollable.
- [NTSB ANC23LA080](https://openairdocs.org/ntsb/ANC23LA080.md): Cessna A185F · Homer, AK · Accident · No injuries · Class 3 · Limited · Final report · Sep 18, 2023 · N7558H · Substantial damage
  > A total loss of engine power for undetermined reasons.
- [NTSB ANC23LA070](https://openairdocs.org/ntsb/ANC23LA070.md): Oliver Robert K Oliver Series 6 · Big Delta, AK · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 25, 2023 · N151RF · Substantial damage
  > A partial loss of engine power for undetermined reasons.
- [NTSB ANC23FA061](https://openairdocs.org/ntsb/ANC23FA061.md): Piper PA-18-150 · Skwentna, AK · Accident · 2 fatal · Class 3 · Field · Final report · Aug 9, 2023 · N4481Z · Destroyed
  > An impact with terrain for reasons that could not be determined because the airplane was not recovered due to the inaccessible nature of the accident site.
- [NTSB ANC23LA054](https://openairdocs.org/ntsb/ANC23LA054.md): Dehavilland DHC-2 MK. I(L20A) · Twin Hills, AK · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 13, 2023 · N302BL · Substantial damage
  > The pilot’s loss of control during initial climb for reasons that could not be determined.
- [NTSB ANC23LA027](https://openairdocs.org/ntsb/ANC23LA027.md): Cessna 182R · Minto, AK · Accident · No injuries · Class 3 · Limited · Final report · Mar 17, 2023 · N6266E · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB ANC22FA069](https://openairdocs.org/ntsb/ANC22FA069.md): Story Charles Brad TT FOX · Wasilla, AK · Accident · 1 fatal · Class 3 · Field · Final report · Aug 29, 2022 · N2723P · Substantial damage
  > The pilot’s inability to maintain control of the airplane for reasons that could not be determined.
- [NTSB ANC22LA054](https://openairdocs.org/ntsb/ANC22LA054.md): Cessna 182D · McGrath, AK · Accident · No injuries · Class 4 · Limited · Final report · Jul 6, 2022 · N8754X · Substantial damage
  > A nose landing gear collapse during landing for reasons that could not be determined based on the available information.
- [NTSB ANC22FA047](https://openairdocs.org/ntsb/ANC22FA047.md): Bell UH1B · Clear, AK · Accident · 1 fatal · Class 3 · Field · Final report · Jun 27, 2022 · N9970F · Destroyed
  > A loss of control for reasons that could not be determined based on the available information.
- [NTSB ANC22LA020](https://openairdocs.org/ntsb/ANC22LA020.md): Piper PA-18-135 · Wasilla, AK · Accident · Minor injuries · Class 3 · Limited · Final report · Feb 27, 2022 · N99640 · Substantial damage
  > A partial loss of engine power for undetermined reasons.
- [NTSB ANC22LA011](https://openairdocs.org/ntsb/ANC22LA011.md): Larry Bingham LB-1 · Haines, AK · Accident · No injuries · Class 3 · Limited · Final report · Dec 15, 2021 · N555LB · Substantial damage
  > A partial loss of engine power for reasons that could not be determined based on available information, which resulted in a precautionary landing and impact with snow.
- [NTSB ANC21LA096](https://openairdocs.org/ntsb/ANC21LA096.md): Piper PA-14 · Chickaloon, AK · Accident · Minor injuries · Class 3 · Limited · Final report · Sep 23, 2021 · N4276H · Substantial damage
  > A total loss of engine power during takeoff for reasons that could not be determined based on the available information.
- [NTSB ANC21LA047](https://openairdocs.org/ntsb/ANC21LA047.md): Piper J3C-65 · Sterling, AK · Accident · No injuries · Class 3 · Limited · Final report · Jun 28, 2021 · N98109 · Substantial damage
  > A partial loss of engine power for reasons that could not be determined based on the available information.
- [NTSB ANC21LA020](https://openairdocs.org/ntsb/ANC21LA020.md): Robinson Helicopter R66 · Kodiak, AK · Accident · 1 fatal · Class 3 · Limited · Final report · Mar 3, 2021 · N1767 · Destroyed
  > An impact with ocean waters for reasons that could not be determined based on the available information.
- [NTSB ANC20LA083](https://openairdocs.org/ntsb/ANC20LA083.md): Eurocopter AS350 · Ninilchik, AK · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 25, 2020 · N160SH · Substantial damage
  > A loss of engine power for an undetermined reason.
- [NTSB ANC18FA071](https://openairdocs.org/ntsb/ANC18FA071.md): Piper PA-12-150 · Healy, AK · Accident · 2 fatal · Field investigation · Final report · Sep 23, 2018 · N7511H · Substantial damage
  > An impact with terrain for reasons that could not be determined based on the available information.
- [NTSB ANC18FA063](https://openairdocs.org/ntsb/ANC18FA063.md): De Havilland DHC-2 · Talkeetna, AK · Accident · 5 fatal · Field investigation · Final report · Aug 5, 2018 · N323KT · Substantial damage
  > Impact with terrain for reasons that could not be determined because the airplane was not recovered due to the inaccessible nature of the accident site.
- [NTSB ANC18FA050](https://openairdocs.org/ntsb/ANC18FA050.md): Piper PA 18-150 · Delta Junction, AK · Accident · 2 fatal · Field investigation · Final report · Jun 24, 2018 · N8664Y · Substantial damage
  > Undetermined based on the available evidence.
- [NTSB ANC18FA044](https://openairdocs.org/ntsb/ANC18FA044.md): Piper PA18 · Sitka, AK · Accident · 2 fatal · Class 2 · Field · Final report · Jun 9, 2018 · N1203A · Substantial damage
  > The pilot's exceedance of the airplane's critical angle of attack for unknown reason, which resulted in an aerodynamic stall and a loss of control.
- [NTSB ANC17LA016](https://openairdocs.org/ntsb/ANC17LA016.md): Piper PA18 · Sterling, AK · Accident · Serious injuries · Limited investigation · Final report · Feb 9, 2017 · N1268A · Substantial damage
  > The pilot’s loss of control while maneuvering for reasons that could not be determined based on the available information.
- [NTSB GAA17CA101](https://openairdocs.org/ntsb/GAA17CA101.md): Maule MX 7 · Willow, AK · Accident · No injuries · Data collection · Final report · Dec 15, 2016 · N56681 · Substantial damage
  > The pilot’s failure to ensure that the runway was clear of any obstacles before departure, which resulted in the airplane impacting a snowdrift.
- [NTSB ANC17FA010](https://openairdocs.org/ntsb/ANC17FA010.md): Piper PA 28-180 · Port Alsworth, AK · Accident · 4 fatal · Field investigation · Final report · Dec 7, 2016 · N8648N · Substantial damage
  > Undetermined due to a lack of physical evidence.
- [NTSB ANC15LA073](https://openairdocs.org/ntsb/ANC15LA073.md): Robinson Helicopter R44 · Fort Glenn, AK · Accident · No injuries · Limited investigation · Final report · Sep 19, 2015 · N7162R · Substantial damage
  > The separation of the tail rotor gearbox from the tailboom attachment point due to overstress loads imposed by a tail rotor blade imbalance as the result of impact with an undetermined object during low-level flight operations.
- [NTSB GAA15LA281](https://openairdocs.org/ntsb/GAA15LA281.md): Dehavilland DHC 2 MK.I · Nikolai, AK · Accident · No injuries · Limited investigation · Final report · Sep 14, 2015 · N676SP · Substantial damage
  > A loss of directional control during a water takeoff for reasons that could not be determined because the airplane was not examined due to the remote accident location.
- [NTSB ANC14FA062](https://openairdocs.org/ntsb/ANC14FA062.md): Piper PA-24-250 · Big Lake, AK · Accident · 1 fatal · Field investigation · Final report · Aug 10, 2014 · N5158P · Substantial damage
  > The pilot's impairment due to alcohol consumption, which resulted in his failure to maintain clearance from trees.
- [NTSB ANC13FA004](https://openairdocs.org/ntsb/ANC13FA004.md): Grumman Aircraft ENG C-1A · Willow, AK · Accident · 1 fatal · Field investigation · Final report · Oct 15, 2012 · N27PH · Destroyed
  > The pilot’s loss of control of the airplane for reasons that could not be determined because the wreckage was not recovered from the accident site.
- [NTSB ANC11LA080](https://openairdocs.org/ntsb/ANC11LA080.md): Piper PA-18-150 · Cape Yakataga, AK · Accident · 2 fatal · Limited investigation · Final report · Aug 16, 2011 · N4205Z · Substantial damage
  > A collision into water during initial climb after takeoff for undetermined reasons.

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."eventStateOrRegion" = 'AK' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '000' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/000/sequence?state=AK

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.