# NTSB investigations: Lycoming VO-435 series, 1993

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 ATL94LA009](https://openairdocs.org/ntsb/ATL94LA009.md): Bell 47G2 · Billingsley, AL · Accident · No injuries · Limited investigation · Final report · Oct 25, 1993 · N866Z · Substantial damage
  > The pilot's improper vertical liftoff which resulted in dynamic roll-over and the main rotor's impact with the ground.
- [NTSB CHI93DEP05](https://openairdocs.org/ntsb/CHI93DEP05.md): Bell 47-G5 · Fulton, WI · Accident · Minor injuries · Final report · Aug 25, 1993 · N1464W · Substantial damage
  > the failure (fracture) of the number one cylinder intake valve retainer (keeper).
- [NTSB CHI93LA320](https://openairdocs.org/ntsb/CHI93LA320.md): Bell 47-G5 · Schaumburg, IL · Accident · Minor injuries · Limited investigation · Final report · Aug 12, 1993 · N1347X · Substantial damage
  > the pilot's improper autorotation techniques.
- [NTSB DEN93LA091](https://openairdocs.org/ntsb/DEN93LA091.md): Continental Copters Tomcat MK5A · Duson, LA · Accident · No injuries · Limited investigation · Final report · Jul 30, 1993 · N9014T · Substantial damage
  > Failure of the transmission mast bearing, resulting in oil contamination and subsequent blockage of the internal oil ports and passages. Factors were: total loss of collective control and partial loss of cyclic control.
- [NTSB FTW93LA178](https://openairdocs.org/ntsb/FTW93LA178.md): Bell-Transworld 47G-2 · Wynne, AR · Accident · No injuries · Limited investigation · Final report · Jun 5, 1993 · N9238Z · Substantial damage
  > Partial power loss due to the failure of one magneto. A factor was the lack of suitable terrain for the forced landing.
- [NTSB CHI93LA179](https://openairdocs.org/ntsb/CHI93LA179.md): Bell 47 · Berlin, WI · Accident · Minor injuries · Limited investigation · Final report · May 21, 1993 · N8458E · Destroyed
  > The pilot-in-command's failure to see the obstruction.
- [NTSB LAX93LA157](https://openairdocs.org/ntsb/LAX93LA157.md): Bell 47G5 · Greenfield, CA · Accident · Minor injuries · Limited investigation · Final report · Mar 20, 1993 · N7080J · Substantial damage
  > The pilot's failure to maintain an adequate clearance from the power lines while performing an aerial application run.
- [NTSB MIA93LA076](https://openairdocs.org/ntsb/MIA93LA076.md): Huddleston-Bell 47G2 · Rio Grande, PR · Accident · Minor injuries · Limited investigation · Final report · Feb 28, 1993 · N37870 · Substantial damage
  > Poor in-flight planning by the pilot-in-command. Contributing to the accident was the flight's lack of total experience.

## 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") = 1993
  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=1993

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