# NTSB investigations: Lycoming VO-435 series, 1990

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 LAX91LA013](https://openairdocs.org/ntsb/LAX91LA013.md): Bell 47G5 · Antarctica · Accident · 2 fatal · Limited investigation · Final report · Oct 22, 1990 · N2294W · Destroyed
  > The pilot's failure to maintain on adequate altitude while maneuvering above the water.
- [NTSB CHI90LA205](https://openairdocs.org/ntsb/CHI90LA205.md): Bell 47G-5 · Hudson, IA · Accident · No injuries · Limited investigation · Final report · Jul 30, 1990 · N8140J · Substantial damage
  > Improper touchdown performed by the pilot in command.
- [NTSB MKC90LA144](https://openairdocs.org/ntsb/MKC90LA144.md): Bell 47D-1 · Fair Oaks, AR · Accident · Minor injuries · Limited investigation · Final report · Jul 12, 1990 · N8117 · Substantial damage
  > Tail rotor cable disengagement due to inadequate maintenance.
- [NTSB CHI90DEP07](https://openairdocs.org/ntsb/CHI90DEP07.md): Bell 47-G2 · Hatley, WI · Accident · No injuries · Final report · Jul 10, 1990 · N6768D · Substantial damage
  > The partial loss of power due to sticking intake valves.
- [NTSB MKC90LA138](https://openairdocs.org/ntsb/MKC90LA138.md): Hiller 12-E · Watson, MN · Accident · No injuries · Limited investigation · Final report · Jun 26, 1990 · N62397 · Substantial damage
  > Pilot misjudged his flare and collided with the terrain.
- [NTSB NYC90LA122](https://openairdocs.org/ntsb/NYC90LA122.md): Bell 47G-3B1 · Becket, MA · Accident · No injuries · Limited investigation · Final report · May 31, 1990 · N39268 · Substantial damage
  > A power loss due to oil starvation, after maintenance personnel failed to comply with Lycoming directives during the engine overhaul. Factors related to the accident were: improper adjustment of the engine oil pressure by maintenance personnel and unsuitable…

## 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 year(c."eventDate") = 1990
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41525&year=1990

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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.