# NTSB investigations: Franklin 6V-335 series

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 CEN23LA383](https://openairdocs.org/ntsb/CEN23LA383.md): Hiller UH-12A · Mosby, MO · Accident · No injuries · Class 4 · Limited · Final report · Aug 27, 2023 · N8178H · Substantial damage
  > The pilot’s failure to maintain adequate rotor rpm which resulted in a loss of control and impact with terrain.
- [NTSB ERA22LA039](https://openairdocs.org/ntsb/ERA22LA039.md): Bell 47D1 · Zelienople, PA · Accident · No injuries · Class 3 · Limited · Final report · Oct 31, 2021 · N132BR · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB CEN21LA124](https://openairdocs.org/ntsb/CEN21LA124.md): Hiller UH12C · Lafayette, IN · Accident · No injuries · Class 4 · Limited · Final report · Jan 12, 2021 · N552DR · Substantial damage
  > The pilot’s failure to maintain control of the helicopter shortly after liftoff into a hover, which resulted in a dynamic rollover when the left landing skid contacted the ground.
- [NTSB CHI08LA151](https://openairdocs.org/ntsb/CHI08LA151.md): Bell 47D1 · Carrollton, OH · Accident · No injuries · Limited investigation · Final report · Jun 1, 2008 · N74898 · Substantial damage
  > The airframe vibration for an undetermined reason.
- [NTSB DEN03LA051](https://openairdocs.org/ntsb/DEN03LA051.md): Panzl PAN · Vernal, UT · Accident · Minor injuries · Limited investigation · Final report · Mar 18, 2003 · N11ZL · Substantial damage
  > the pilot's inadequate preflight preparation and his lack of familiarity with the airplane, which subsequently resulted in fuel starvation to the engine. Contributing factors were unfavorable wind conditions and the downdraft weather condition.
- [NTSB MIA93FA121](https://openairdocs.org/ntsb/MIA93FA121.md): Bell 47-G · Parker, FL · Accident · 2 fatal · Field investigation · Final report · May 16, 1993 · N970B · Destroyed
  > the misjudgement of the distance by the nonrated pilot-in-command and subsequent collision with a tree. Contributing to the accident was the lack of helicopter experience of the pilot-in-command.
- [NTSB FTW93LA047](https://openairdocs.org/ntsb/FTW93LA047.md): Hiller UH12B · Justin, TX · Accident · No injuries · Limited investigation · Final report · Dec 2, 1992 · N1048P · Substantial damage
  > Failure of the main rotor system for undetermined reasons. A factor was the lack of suitable terrain at the pilot's disposal.
- [NTSB BFO92LA102](https://openairdocs.org/ntsb/BFO92LA102.md): Bell 47G · Southwick, MA · Accident · No injuries · Limited investigation · Final report · Jul 15, 1992 · N3109G · Substantial damage
  > Improper adjustment of the stabilizer control system by maintenance personnel.
- [NTSB NYC91LA189](https://openairdocs.org/ntsb/NYC91LA189.md): Hiller UH-12B · Westfield, MA · Accident · No injuries · Limited investigation · Final report · Jul 27, 1991 · N62246 · Substantial damage
  > The pilot's failure to refuel resulting in a power failure due to fuel exhaustion, and subsequent forced landing in unsuitable terrain.
- [NTSB FTW91LA126](https://openairdocs.org/ntsb/FTW91LA126.md): Bell 47D-1 · Provencal, LA · Accident · No injuries · Limited investigation · Final report · Jul 24, 1991 · N3575 · Substantial damage
  > Fuel leakage from the fuel drain valve. A factor was the inaccessibility of suitable terrain for fored landing.
- [NTSB NYC89LA025](https://openairdocs.org/ntsb/NYC89LA025.md): Bell 47G · Champion, NY · Accident · Minor injuries · Limited investigation · Final report · Nov 10, 1988 · N2AR · Substantial damage
  > The pilot was unable to sustain flight due to a severe downdraft accompanied by a power loss at a low altitude.
- [NTSB ATL88LA232](https://openairdocs.org/ntsb/ATL88LA232.md): Hiller UH-12A · Paducah, KY · Accident · Serious injuries · Limited investigation · Final report · Aug 20, 1988 · N4828E · Substantial damage
  > After departure the eng quit & PIC made an autorotative landing in a wooded area. Initial exam of eng revealed water in the carb float bowl. Investigation showed helo had 100 hr inspection recorded in the log, but may have been returned to service by mechanic…
- [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 LAX85LA309](https://openairdocs.org/ntsb/LAX85LA309.md): Hiller UH-12B · Durham, CA · Accident · No injuries · Limited investigation · Final report · Jul 7, 1985 · N1048P · Substantial damage
  > The purpose of the LCL flight was for the CFI to demo the newly acquired helicopter to its owner. The CFI reported that during the flt a 'somewhat common' vibration was detected, & he associated the vibration with the acft's wooden main rotor blades. He…
- [NTSB NYC85FGM02](https://openairdocs.org/ntsb/NYC85FGM02.md): Hiller UH-12B · Butler, PA · Accident · Serious injuries · Final report · Nov 15, 1984 · N17129 · Substantial damage
  > After training at mcville arpt for about 1HR & 15MIN the plt decided to purchase fuel, taxied to the fuel pumps & discovered that the operator was not there. The CFI EST that there was sufficient fuel to fly to Butler county arpt, aprx 18 miles away. During…
- [NTSB MKC84LA102](https://openairdocs.org/ntsb/MKC84LA102.md): Hiller UH-12B · Ulysses, KS · Accident · No injuries · Limited investigation · Final report · Mar 15, 1984 · N1021Y · Substantial damage
  > The plt made an autorotative precautionary landing after feeling vibrations in the anti-torque pedals. The acft was turned into the wind but landed hard in a field. The plt upon exiting the acft found the anti-torque rotor and gearbox missing. They were found…
- [NTSB LAX84FA106](https://openairdocs.org/ntsb/LAX84FA106.md): Hiller UH-12A · Van Nuys, CA · Accident · No injuries · Field investigation · Final report · Dec 16, 1983 · N8108H · Substantial damage
  > The instructor plt (CFI) stated that the eng quit 2 times after he refueled the helicopter. He then drained a quantity of water from the fuel gascolator & restarted the helicopter. After that he air taxied the helicopter to the flt school where, without…
- [NTSB NYC81DFJ06](https://openairdocs.org/ntsb/NYC81DFJ06.md): Hiller UH-12B · Jamestown, NY · Accident · Minor injuries · Closed · Feb 27, 1981 · N90803 · Substantial damage
- [NTSB MIA80FA112](https://openairdocs.org/ntsb/MIA80FA112.md): Cambell 47-D1G · Panama City, FL · Accident · 1 fatal · Closed · Sep 22, 1980 · N3109G · Destroyed
- [NTSB FTW79DPJ37](https://openairdocs.org/ntsb/FTW79DPJ37.md): Bell 47D1 · Ardmore, OK · Accident · No injuries · Closed · Sep 12, 1979 · N3575 · Substantial damage
- [NTSB MIA79DKT30](https://openairdocs.org/ntsb/MIA79DKT30.md): Bell 47G · Opa Locka, FL · Accident · No injuries · Closed · Jan 7, 1979 · N2AR · Destroyed
- [NTSB MIA77DLA38](https://openairdocs.org/ntsb/MIA77DLA38.md): Bell 47D1 · Panama City, FL · Accident · Minor injuries · Closed · Jul 18, 1977 · N3109G · Substantial damage
- [NTSB MIA77DLA37](https://openairdocs.org/ntsb/MIA77DLA37.md): Bell 47D1G · Panama Cy Bch, FL · Accident · No injuries · Closed · Jun 17, 1977 · N3109G · Substantial damage
- [NTSB SEA77DYM34](https://openairdocs.org/ntsb/SEA77DYM34.md): Hiller Acft UH-12C · Albany, OR · Accident · Serious injuries · Closed · May 28, 1977 · N8108H · Destroyed
- [NTSB MIA77DKJ37](https://openairdocs.org/ntsb/MIA77DKJ37.md): Bell 47D1 · Ozark, AL · Accident · No injuries · Closed · May 15, 1977 · N74898 · Substantial damage
- [NTSB MIA77DKG08](https://openairdocs.org/ntsb/MIA77DKG08.md): Bell 47D1 · Vanceville, GA · Accident · No injuries · Closed · Dec 12, 1976 · N3575 · Substantial damage
- [NTSB MIA76DKJ53](https://openairdocs.org/ntsb/MIA76DKJ53.md): Bell 47D1 · Enterprise, AL · Accident · No injuries · Closed · Mar 6, 1976 · N3109G · Substantial damage
- [NTSB SEA76FYC20](https://openairdocs.org/ntsb/SEA76FYC20.md): Hiller Acft UH-12B · Brownsville, OR · Accident · No injuries · Closed · Sep 20, 1975 · N8108H · Substantial damage
- [NTSB MIA75FKJ54](https://openairdocs.org/ntsb/MIA75FKJ54.md): Bell 47D1-G · Abbeville, AL · Accident · Serious injuries · Closed · Apr 7, 1975 · N3109G · Destroyed
- [NTSB MIA72DLA26](https://openairdocs.org/ntsb/MIA72DLA26.md): Bell 47D1 · Milton, FL · Accident · Minor injuries · Closed · Dec 17, 1971 · N3109G · Substantial damage
- [NTSB SEA71FYC42](https://openairdocs.org/ntsb/SEA71FYC42.md): Hiller UH12A · Brooks, OR · Accident · 1 fatal · Closed · Jun 11, 1971 · N8178H · Destroyed
- [NTSB MKC68A0049](https://openairdocs.org/ntsb/MKC68A0049.md): Bell 47G · Onawa, IA · Accident · No injuries · Closed · Feb 6, 1968 · N970B · Destroyed
- [NTSB OAK68A0036](https://openairdocs.org/ntsb/OAK68A0036.md): Hiller UH-12C · Riverdale, CA · Accident · No injuries · Closed · Oct 15, 1967 · N5321V · Substantial damage
- [NTSB MIA66A0006](https://openairdocs.org/ntsb/MIA66A0006-201538.md): Bell 47-D1 · Panama City, FL · Accident · No injuries · Closed · Jul 11, 1965 · N3109G · Substantial damage
- [NTSB UNK64X4188](https://openairdocs.org/ntsb/UNK64X4188.md): Bell 47G · Bakersfield, CA · Accident · No injuries · Closed · Sep 27, 1964 · N970B · 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27039'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27039

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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.