# NTSB investigations: Franklin 6V4 series, WA

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 WPR12LA244](https://openairdocs.org/ntsb/WPR12LA244.md): Hiller UH-12B · Pasco, WA · Accident · No injuries · Limited investigation · Final report · Jun 4, 2012 · N93467 · Substantial damage
  > The pilot's failure to maintain the helicopter's rotor rpm while maneuvering at a low altitude over a fruit orchard.
- [NTSB SEA92LA141](https://openairdocs.org/ntsb/SEA92LA141.md): Bell-World 47D1 · Wenatchee, WA · Accident · No injuries · Limited investigation · Final report · Jun 29, 1992 · N17301 · Destroyed
  > Carburetor ice and the pilot in command's not being able to maintain clearance. Factors contributing to the accident were: carburetor icing conditions and tree(s).
- [NTSB SEA89LA120](https://openairdocs.org/ntsb/SEA89LA120.md): Bell 47G-2 · Centralia, WA · Accident · Minor injuries · Limited investigation · Final report · Jun 24, 1989 · N1161N · Destroyed
  > The pilot misjudged his clearance over trees, which resulted in an in-flight tail rotor strike with the trees and loss of tail rotor control. The trees were a related factor.
- [NTSB SEA87LA172](https://openairdocs.org/ntsb/SEA87LA172.md): Bell 47G2 · Grandview, WA · Accident · Serious injuries · Limited investigation · Final report · Aug 21, 1987 · N74161 · Substantial damage
  > After the completion of spray operations the pilot was attempting to place the helicopter onto a trailer. The pilot misjudged his position, over-corrected, and then lost control of the helicopter, striking the ground.
- [NTSB SEA83LA069](https://openairdocs.org/ntsb/SEA83LA069.md): Continental Copters Mkiii · Pasco, WA · Accident · No injuries · Limited investigation · Final report · Apr 1, 1983 · N73865 · Substantial damage
  > While repositioning the helicopter from the ground onto a trailer the acft rolled over when the right skid caught onto the trailer.
- [NTSB SEA81FYP12](https://openairdocs.org/ntsb/SEA81FYP12.md): Bell 47G-2 · Union Gap, WA · Accident · No injuries · Closed · Apr 2, 1981 · N74161 · Substantial damage
- [NTSB SEA78DYP35](https://openairdocs.org/ntsb/SEA78DYP35.md): Bell 47G · Anatone, WA · Accident · No injuries · Closed · Jun 23, 1978 · N6356X · Substantial damage
- [NTSB SEA77FYE19](https://openairdocs.org/ntsb/SEA77FYE19.md): Bell 47D1 · Enumclaw, WA · Accident · No injuries · Closed · May 14, 1977 · N17301 · Substantial damage
- [NTSB SEA76DYG01](https://openairdocs.org/ntsb/SEA76DYG01.md): Bell 47G-2 · Moses Lake, WA · Accident · Minor injuries · Closed · Jul 1, 1975 · N984B · Destroyed
- [NTSB SEA74DYE42](https://openairdocs.org/ntsb/SEA74DYE42.md): Bell 47G-2 · Centralia, WA · Accident · No injuries · Closed · Apr 18, 1974 · N984B · Substantial damage
- [NTSB SEA74AYE04](https://openairdocs.org/ntsb/SEA74AYE04.md): Bell 47D · Anacortes, WA · Accident · No injuries · Closed · Jul 7, 1973 · N964B · Substantial damage
- [NTSB SEA73FYG36](https://openairdocs.org/ntsb/SEA73FYG36.md): Bell Tomcat · Harrington, WA · Accident · Serious injuries · Closed · May 26, 1973 · N73865 · Substantial damage
- [NTSB SEA70F0019](https://openairdocs.org/ntsb/SEA70F0019.md): Bell 47G · Stanwood, WA · Accident · No injuries · Closed · Jun 18, 1969 · N964B · Substantial damage
- [NTSB SEA67A0042](https://openairdocs.org/ntsb/SEA67A0042.md): Hiller UH-12C · Rosalia, WA · Accident · No injuries · Closed · Dec 12, 1966 · N5316V · Substantial damage
- [NTSB SEA66A0031](https://openairdocs.org/ntsb/SEA66A0031.md): Hiller UH-12B · Federal Way, WA · Accident · No injuries · Closed · Nov 11, 1965 · N7212H · Substantial damage
- [NTSB UNK64X2935](https://openairdocs.org/ntsb/UNK64X2935.md): Bell 47D1 · Toppenish, WA · Accident · No injuries · Closed · Jul 19, 1964 · N1161N · 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" = 'WA' 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 ('27033'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27033&state=WA

---
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.