# NTSB investigations: Lycoming HIO-360 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 ANC23LA069](https://openairdocs.org/ntsb/ANC23LA069.md): Bellanca 8GCBC · Cordova, AK · Accident · No injuries · Class 4 · Limited · Final report · Sep 3, 2023 · N723AK · Substantial damage
  > The pilot’s exceedance of the airplane’s critical angle of attack during landing, which resulted in an aerodynamic stall and loss of airplane control.
- [NTSB ANC21LA038](https://openairdocs.org/ntsb/ANC21LA038.md): Enstrom F-28F · Palmer, AK · Accident · No injuries · Class 3 · Limited · Final report · May 9, 2021 · N8627J · Substantial damage
  > A loss of drive to the rotor system due to the disengagement of the main belt drive tensioning system, which resulted in a forced landing. The disengagement was due to inadequate clearance between the clutch handle and the roll pin in the handle bellcrank…
- [NTSB ANC98LA109](https://openairdocs.org/ntsb/ANC98LA109.md): Enstrom F-28F · Skwentna, AK · Accident · No injuries · Limited investigation · Final report · Jul 25, 1998 · N8622U · Substantial damage
  > A loss of engine power due to a fractured number three cylinder intake manifold flange, and the pilot's inability to maintain the proper rate of descent during the autorotation flare. A contributing factor associated with the accident was the downwind…
- [NTSB ANC98LA037](https://openairdocs.org/ntsb/ANC98LA037.md): Enstrom F-28F · Haines, AK · Accident · Minor injuries · Limited investigation · Final report · Apr 12, 1998 · N199LB · Substantial damage
  > The pilot flaring too low during an improper practice autorotation.
- [NTSB ANC94LA132](https://openairdocs.org/ntsb/ANC94LA132.md): James Chisum CHISUM-SCRAPS · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Sep 7, 1994 · N1771C · Substantial damage
  > The failure of the pilot to maintain directional control of the airplane. Factors in the accident were the soft terrain and inadequate remedial action.
- [NTSB SEA88LA127](https://openairdocs.org/ntsb/SEA88LA127.md): Enstrom F-28F · Haines, AK · Accident · No injuries · Limited investigation · Final report · Jul 13, 1988 · N8620C · Substantial damage
  > The pilot purchased the helicopter with an undocumented modification designed to restrain the collective. Reportedly, hereceived no guidance regarding the use of the collective hold-down device. According to the aircraft manufacturer there existed no Enstrom…
- [NTSB SEA88LA073](https://openairdocs.org/ntsb/SEA88LA073.md): Hughes 269C · Sitka, AK · Accident · No injuries · Limited investigation · Final report · Apr 12, 1988 · N92PC · Substantial damage
  > During sling operations, the long line became separated and entangled in the tail rotor at about 300 feet AGL. The pilot landed the helicopter onto a beach area where it rolled over onto its left side striking the main rotor. No accident report has been filed…
- [NTSB ANC82DAG01](https://openairdocs.org/ntsb/ANC82DAG01.md): Enstrom F-28C · Big Lake, AK · Accident · No injuries · Closed · Oct 1, 1981 · N51727 · Substantial damage
- [NTSB ANC80FA052](https://openairdocs.org/ntsb/ANC80FA052.md): Enstrom F-28-C · Talkeetna, AK · Accident · No injuries · Closed · Jun 19, 1980 · N544H · 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 ('41524'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41524&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.