# NTSB investigations: Lycoming GO-480 series, AK

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 ANC25LA095](https://openairdocs.org/ntsb/ANC25LA095.md): Helio H-395 · Pilot Point, AK · Accident · No injuries · Class 4 · Limited · Final report · Aug 21, 2025 · N44344 · Substantial damage
  > The pilot's inadequate takeoff performance planning, which resulted in a runway excursion and collision with terrain.
- [NTSB ANC23LA082](https://openairdocs.org/ntsb/ANC23LA082.md): Helio H-295 · Fairbanks, AK · Accident · No injuries · Class 4 · Limited · Final report · Sep 17, 2023 · N713C · Substantial damage
  > The pilot’s encounter with windshear during initial climb out, which resulted in a loss of control.
- [NTSB ANC20CA092](https://openairdocs.org/ntsb/ANC20CA092.md): Helio H 295 · Fairbanks, AK · Accident · No injuries · Class 4 · Data collection · Final report · Sep 10, 2020 · N68857 · Substantial damage
  > The pilot’s decision to initiate a right turn immediately after departure and his failure to maintain a proper crosswind correction, which resulted in a collision with terrain.
- [NTSB ANC16LA071](https://openairdocs.org/ntsb/ANC16LA071.md): Helio H-295 · Delta Junction, AK · Accident · No injuries · Limited investigation · Final report · Sep 26, 2016 · N68857 · Substantial damage
  > The pilot’s decision to take off from a wet, snowy airstrip and his delayed decision to abort the takeoff, which resulted in a runway excursion.
- [NTSB ANC16LA067](https://openairdocs.org/ntsb/ANC16LA067.md): Helio H 295 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Sep 16, 2016 · N6464V · Substantial damage
  > Excessive side loads imposed on the tailwheel A-frame during the takeoff roll, which resulted in a separation of the tailwheel and the subsequent loss of directional control.
- [NTSB GAA15CA268](https://openairdocs.org/ntsb/GAA15CA268.md): Helio H 395 · Bethel, AK · Accident · No injuries · Data collection · Final report · Sep 18, 2015 · N910SP · Substantial damage
  > The pilot's failure to maintain a positive climb rate during takeoff initial climb, resulting in an uncontrolled descent and collision with trees and terrain.
- [NTSB ANC15LA070](https://openairdocs.org/ntsb/ANC15LA070.md): Helio H 295 · Delta Junction, AK · Accident · No injuries · Limited investigation · Final report · Sep 13, 2015 · N6464V · Substantial damage
  > A partial loss of engine power during takeoff for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB ANC15LA004](https://openairdocs.org/ntsb/ANC15LA004.md): Helio H 295 · Nenana, AK · Accident · No injuries · Limited investigation · Final report · Nov 15, 2014 · N6465V · Substantial damage
  > The partial loss of engine power for reasons that could not be determined because postaccident examination of the engine revealed no evidence of any preimpact mechanical anomalies.
- [NTSB ANC14CA082](https://openairdocs.org/ntsb/ANC14CA082.md): Helio H 295 · Prospect Creek, AK · Accident · Minor injuries · Data collection · Final report · Sep 16, 2014 · N50718 · Substantial damage
  > The pilot's loss of directional control during takeoff, in gusty and variable wind conditions, resulting in a collision with terrain.
- [NTSB ANC12CA020](https://openairdocs.org/ntsb/ANC12CA020.md): Helio H-295 · Old Minto, AK · Accident · No injuries · Data collection · Final report · Jan 26, 2012 · N713C · Substantial damage
  > The pilot's decision to land on unsuitable terrain, which resulted in the airplane nosing over.
- [NTSB ANC09CA091](https://openairdocs.org/ntsb/ANC09CA091.md): Helio H-295 · Koliganek, AK · Accident · No injuries · Data collection · Final report · Sep 2, 2009 · N6468V · Substantial damage
  > A loss of engine power during cruise flight due to water in the fuel, and the pilot's inadequate preflight inspection.
- [NTSB ANC09LA023](https://openairdocs.org/ntsb/ANC09LA023.md): Helio H-295 · Healy, AK · Accident · No injuries · Limited investigation · Final report · Mar 14, 2009 · N6478V · Substantial damage
  > The pilot's delay in initiating a climb while he was packing snow with the airplane's skis in preparation for landing, resulting in a collision with brush.
- [NTSB ANC05LA045](https://openairdocs.org/ntsb/ANC05LA045.md): Helio H-295 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Feb 28, 2005 · N6465V · Substantial damage
  > The pilot's delay in performing a go-around, and his failure to maintain obstacle clearance.
- [NTSB ANC02LA101](https://openairdocs.org/ntsb/ANC02LA101.md): Helio H-295 · Igiugig, AK · Accident · No injuries · Limited investigation · Final report · Aug 15, 2002 · N920AS · Substantial damage
  > The pilot's inadequate evaluation of the wind/weather conditions resulting in a collision with an embankment during the takeoff run. A factor contributing to the accident was a sudden wind shift to a tailwind.
- [NTSB ANC02LA089](https://openairdocs.org/ntsb/ANC02LA089.md): Helio H-295 · Fort Yukon, AK · Accident · No injuries · Limited investigation · Final report · Aug 2, 2002 · N50718 · Substantial damage
  > The failure of the axle shaft, which resulted in the separation of the right main tire/wheel from the airplane on landing.
- [NTSB ANC99LA095](https://openairdocs.org/ntsb/ANC99LA095.md): Helio H-395 · Igiugig, AK · Accident · No injuries · Limited investigation · Final report · Jul 20, 1999 · N4198D · Substantial damage
  > The pilot's inadequate compensation for wind conditions during the downwind to upwind taxi turn. Factors associated with this accident were the high crosswind, the pilot's improper use of flaps, and his self-induced pressure because he was behind schedule.
- [NTSB ANC97LA128](https://openairdocs.org/ntsb/ANC97LA128.md): Helio H-295 · Fort Yukon, AK · Accident · No injuries · Limited investigation · Final report · Aug 23, 1997 · N6465V · Substantial damage
  > failure of the pilot to maintain directional control of the airplane, which resulted in a swerve and collision with a tree as the pilot continued the takeoff, subsequently jamming the stabilator and causing the plane to crash in water.
- [NTSB ANC97LA094](https://openairdocs.org/ntsb/ANC97LA094.md): Helio H295 · Ekwok, AK · Accident · No injuries · Limited investigation · Final report · Jun 29, 1997 · N6343V · Substantial damage
  > The pilot's selection of an unsuitable area for takeoff.
- [NTSB ANC96IA039](https://openairdocs.org/ntsb/ANC96IA039.md): Helio H295 · Angoon, AK · Incident · No injuries · Incident investigation · Final report · Mar 29, 1996 · N5462E · Minor damage
  > the pilot's inadequate compensation for the gusty wind conditions. A factor associated with the accident was the gusty wind conditions.
- [NTSB ANC94LA123](https://openairdocs.org/ntsb/ANC94LA123.md): Helio H295 · Artic Village, AK · Accident · No injuries · Limited investigation · Final report · Aug 20, 1994 · N6DB · Substantial damage
  > The pilot selected unsuitable terrain for landing. A factor was the hidden obstruction (hole).
- [NTSB ANC91LA093](https://openairdocs.org/ntsb/ANC91LA093.md): Helio H-295 · Port Alsworth, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 9, 1991 · N456JH · Substantial damage
  > Failure of the pilot to maintain sufficient altitude and clearance from mountainous terrain. Factors related to the accident were: the rising terrain and a downdraft.
- [NTSB ANC90LA138](https://openairdocs.org/ntsb/ANC90LA138.md): Helio HE-3/H-295 · Arctic Village, AK · Accident · No injuries · Limited investigation · Final report · Aug 9, 1990 · N6481V · Substantial damage
  > The pilot in commands improper flare during a forced landing resulting in a hard landing.
- [NTSB ANC88LA122](https://openairdocs.org/ntsb/ANC88LA122.md): Helio H-295 · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Sep 4, 1988 · N456JH · Substantial damage
  > During the takeoff roll on the runway at approximately 20 to 25 mph the pilot lost directional control of the airplane. The airplane looped to the right.
- [NTSB ANC83LA136](https://openairdocs.org/ntsb/ANC83LA136.md): Helio H-295 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Jul 23, 1983 · N6481V · Substantial damage
  > The plt reported that during the landing roll, the left brake failed & the acft ran off the right side of the rwy. Reportedly, the acft was damaged when it went off the gravel rwy at or near the departure end. No malfunction or failure of the brake assembly…
- [NTSB ANC83FA126](https://openairdocs.org/ntsb/ANC83FA126.md): Helio H395 · Fairbanks, AK · Accident · 1 fatal · Field investigation · Final report · Jul 20, 1983 · N4156D · Substantial damage
  > Takeoff was from a dirt driveway which had a usable length 0F 330 ft before it curved north. Before takeoff, the plt hadbent several small trees back away from the driveway & tied them down so they would not interfere with the takeoff. There are numerous…
- [NTSB ANC82DAG24](https://openairdocs.org/ntsb/ANC82DAG24.md): Helio H-395 · Gulkana, AK · Accident · No injuries · Final report · May 8, 1982 · N4156D · Substantial damage
  > The pilot departed fairbanks, Alaska in his wheel equipped Helio H-395 and proceeded on a flight to Gulkana, Alaska. While en route, he elected to land on an island near the junction of the susitna and oshetina rivers. During the landing, the gear fell…
- [NTSB ANC78DA020](https://openairdocs.org/ntsb/ANC78DA020.md): Grumman G-44 · Pilot Point, AK · Accident · Serious injuries · Closed · Feb 14, 1978 · N37189 · Substantial damage
- [NTSB ANC75FAA18](https://openairdocs.org/ntsb/ANC75FAA18.md): Helio Acft H295 · Tanacross, AK · Accident · No injuries · Closed · Nov 14, 1974 · N6487V · Substantial damage
- [NTSB ANC74AA031](https://openairdocs.org/ntsb/ANC74AA031.md): Grumman G-44S · Farewell, AK · Accident · No injuries · Closed · Sep 8, 1973 · N63350 · Substantial damage
- [NTSB ANC70A0005](https://openairdocs.org/ntsb/ANC70A0005.md): Grumman G-44A · Barrow, AK · Accident · 2 fatal · Closed · Jul 13, 1969 · N58Q · Destroyed
- [NTSB ANC67D0070](https://openairdocs.org/ntsb/ANC67D0070.md): Grumman G-44 · Iliamna, AK · Accident · No injuries · Closed · Jul 15, 1966 · N37189 · Substantial damage

## 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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41527'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41527&state=AK

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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.