# NTSB investigations: Bell 47D1, OK

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 FTW02LA044](https://openairdocs.org/ntsb/FTW02LA044.md): Bell 47G · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · Dec 1, 2001 · N5226 · Substantial damage
  > the flight instructor's selection of an unsuitable area for practicing a full touchdown autorotation, which resulted in a nose over. A contributing factor was the soft ground.
- [NTSB FTW96LA192](https://openairdocs.org/ntsb/FTW96LA192.md): Bell 47D1 · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · Apr 26, 1996 · N5226 · Substantial damage
  > the student's inadvertent dynamic rollover, and inadequate supervision by the flight instructor.
- [NTSB FTW95FA181](https://openairdocs.org/ntsb/FTW95FA181.md): Bell 47D1 · Ardmore, OK · Accident · 2 fatal · Field investigation · Final report · Apr 25, 1995 · N2202C · Destroyed
  > Inflight collision with a power transmission array static line when the flight instructor and dual (private pilot) student failed to maintain adequate visual lookout.
- [NTSB FTW90LA041](https://openairdocs.org/ntsb/FTW90LA041.md): Bell 47D1 · Ardmore, OK · Accident · Serious injuries · Limited investigation · Final report · Dec 4, 1989 · N2202C · Substantial damage
  > Pilot's inadequate compensation for existing wind conditions. Contributing to the accident were the gusty tail winds.
- [NTSB FTW89LA104](https://openairdocs.org/ntsb/FTW89LA104.md): Bell 47D-1 · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · May 26, 1989 · N2202C · Substantial damage
  > The flight instructor failed to recognize that the aircraft was developing a dangerous sink rate during the autorotation and take corrective action by executing a power recovery. Contributing to the accident were the gusty wind conditions.
- [NTSB FTW87LA107](https://openairdocs.org/ntsb/FTW87LA107.md): Bell 47D1 · Ardmore, OK · Accident · No injuries · Limited investigation · Final report · Apr 25, 1987 · N3575 · Substantial damage
  > The pilot reportedly heard an unusual noise in the engine and made a precautionary autorotation to landing. Touchdown was on uneven terrain and in a nose low attitude. This resulted in the tail rotor assembly being chopped off the tail boom by the main rotor…
- [NTSB FTW85LA074](https://openairdocs.org/ntsb/FTW85LA074.md): Bell 47D1 · Ardmore, OK · Accident · Serious injuries · Limited investigation · Final report · Dec 7, 1984 · N5226 · Substantial damage
  > The acft collided with power lines during a recovery from a practice autorotational landing. The instructor plt took control of the acft for recovery and did not see the wires.
- [NTSB FTW79DPJ37](https://openairdocs.org/ntsb/FTW79DPJ37.md): Bell 47D1 · Ardmore, OK · Accident · No injuries · Closed · Sep 12, 1979 · N3575 · Substantial damage
- [NTSB FTW74FPM29](https://openairdocs.org/ntsb/FTW74FPM29.md): EL Tomcat 47 · Zafra, OK · Accident · No injuries · Closed · Jun 19, 1974 · N4227A · Destroyed

## 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" = 'OK' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1180802'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1180802&state=OK

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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.