# NTSB investigations: Lycoming GO-435C&D 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 ANC01LA066](https://openairdocs.org/ntsb/ANC01LA066.md): Helio H-391B · Anvik, AK · Accident · No injuries · Limited investigation · Final report · Jun 2, 2001 · N25BA · Substantial damage
  > The pilot's continued operation of the accident airplane with known equipment deficiencies, and an improper installation of the float assembly by maintenance personnel. A factor in the accident was the pilot's delay in aborting the takeoff.
- [NTSB ANC94LA117](https://openairdocs.org/ntsb/ANC94LA117.md): Stinson 108-1 · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Aug 31, 1994 · N9130K · Substantial damage
  > The binding in the mechanical fuel selector valve, and lack of suitable terrain for a forced landing.
- [NTSB ANC90LA178](https://openairdocs.org/ntsb/ANC90LA178.md): Helio H-391B · Circle, AK · Accident · No injuries · Limited investigation · Final report · Sep 13, 1990 · N316HW · Substantial damage
  > Pilot-in-command's failure to maintain airplane control and the pilot's failure to identify the stall.
- [NTSB ANC84LA126](https://openairdocs.org/ntsb/ANC84LA126.md): Grumman G-44A · Shanin Lake, AK · Accident · No injuries · Limited investigation · Final report · Jul 28, 1984 · N9900H · Substantial damage
  > The plt reported that shortly after takeoff the acft encountered severe wind shear. The plt lost directional control of the acft & it collided with a mud bank.
- [NTSB ANC83LA011](https://openairdocs.org/ntsb/ANC83LA011.md): Beech 50 · Quinhagak, AK · Accident · No injuries · Limited investigation · Final report · Nov 3, 1982 · N3582B · Substantial damage
  > Left engine lost power after takeoff. Pilot feathered left engine and returned to runway on one engine. Since he was overshooting he elected to land on grass wheels up to avoid overrun and collision with ditch. The following discrepancies were found: exhaust…
- [NTSB ANC77DAH05](https://openairdocs.org/ntsb/ANC77DAH05-201360.md): Helio Acft H-391B · Anchorage, AK · Accident · No injuries · Closed · Oct 23, 1976 · N4144D · Substantial damage
- [NTSB ANC71DAG83](https://openairdocs.org/ntsb/ANC71DAG83.md): Helio H391B · Anchorage, AK · Accident · No injuries · Closed · Apr 10, 1971 · N4123D · Substantial damage
- [NTSB ANC71DAG19](https://openairdocs.org/ntsb/ANC71DAG19.md): Helio Acft H-391B · Ninilchik, AK · Accident · No injuries · Closed · Aug 24, 1970 · N4123D · 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 ('41521'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41521&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.