# NTSB investigations: Franklin 6A&6V335 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.

Page 1 of 2 · 60 cases

## Latest cases

- [NTSB WPR25LA196](https://openairdocs.org/ntsb/WPR25LA196.md): Maule M-4-220C · Pendleton, OR · Accident · No injuries · Class 4 · Limited · Final report · Jun 24, 2025 · N2051U · Substantial damage
  > The pilot’s failure to maintain directional control during landing, in gusting crosswind conditions.
- [NTSB GAA18CA119](https://openairdocs.org/ntsb/GAA18CA119.md): Cessna 172 · Juneau, AK · Accident · No injuries · Data collection · Final report · Feb 5, 2018 · N271BJ · Substantial damage
  > The pilot’s selection of unsuitable terrain for landing, which resulted in a nose-over.
- [NTSB GAA15CA067](https://openairdocs.org/ntsb/GAA15CA067.md): Maule M 4-220C · Rigby, ID · Accident · No injuries · Data collection · Final report · May 11, 2015 · N2058U · Substantial damage
  > The pilot's failure to maintain directional control of the airplane during landing roll.
- [NTSB WPR14FA252](https://openairdocs.org/ntsb/WPR14FA252.md): Cessna 175 · Moab, UT · Accident · 1 fatal · Field investigation · Final report · Jun 18, 2014 · N7043M · Destroyed
  > The pilot’s decision to approach rising mountainous terrain at too low an altitude to clear it and his subsequent attempt to climb, which exceeded the airplane’s critical angle-of-attack and resulted in a stall/spin.
- [NTSB WPR13LA050](https://openairdocs.org/ntsb/WPR13LA050.md): Sater Coot A-Amphib · San Andreas, CA · Accident · 1 fatal · Limited investigation · Final report · Nov 23, 2012 · N8VS · Substantial damage
  > The pilot's excessive flight control inputs, which led to flight that exceeded the structural limits of the airplane and resulted in structural failure of both wings.
- [NTSB CEN10CA195](https://openairdocs.org/ntsb/CEN10CA195.md): Cessna 175 · Eveleth, MN · Accident · No injuries · Data collection · Final report · Apr 6, 2010 · N9266B · Substantial damage
  > The pilot's selection of unsuitable terrain for landing.
- [NTSB MIA07LA089](https://openairdocs.org/ntsb/MIA07LA089.md): Hiller UH-12C · Plant City, FL · Accident · Serious injuries · Limited investigation · Final report · Apr 27, 2007 · N92993 · Substantial damage
  > The loss of engine power due to a magneto impulse coupling failure for undetermined reasons.
- [NTSB ANC07LA026](https://openairdocs.org/ntsb/ANC07LA026.md): Cessna 175 · Bunnell, FL · Accident · No injuries · Limited investigation · Final report · Mar 31, 2007 · N8092T · Substantial damage
  > The loss of engine power during cruise due to the separation of an engine piston, which resulted in a forced landing in a swamp and a collision with trees.
- [NTSB ATL06LA130](https://openairdocs.org/ntsb/ATL06LA130.md): Bellanca 14-13-2 · Ellijay, GA · Accident · Minor injuries · Limited investigation · Final report · Sep 25, 2006 · N74475 · Substantial damage
  > A loss of engine power due to fuel contamination. Also causal was the mechanic's failure to ensure the aircraft's fuel system was free of contamination while performing an annual inspection.
- [NTSB LAX03CA274](https://openairdocs.org/ntsb/LAX03CA274.md): Bell 47D1 · Chino, CA · Accident · Serious injuries · Data collection · Final report · Sep 2, 2003 · N64580 · Substantial damage
  > the student pilot's inappropriate remedial action through the application of excessive aft cyclic during a run-on landing. A factor in the accident was the student's disregard for company procedures.
- [NTSB DEN03FA113](https://openairdocs.org/ntsb/DEN03FA113.md): Mattison Starduster Too · Ellicott, CO · Accident · 1 fatal · Field investigation · Final report · Jun 28, 2003 · N80T · Destroyed
  > the pilot's improper in-flight planning/decision to perform aerobatics at low altitude and the failed welds at the elevator horn and torque tube. Factors contributing to the accident were the pilot performing aerobatics at low altitude, his inability to…
- [NTSB LAX01FA236](https://openairdocs.org/ntsb/LAX01FA236.md): Bell 47D-1 · Riverside, CA · Accident · No injuries · Field investigation · Final report · Jul 6, 2001 · N64580 · Substantial damage
  > The engine crankshaft's failure as the result of fatigue cracking initiated by surface damage and localized overheating due to the installation at overhaul of incorrectly sized bearings.
- [NTSB FTW00LA096](https://openairdocs.org/ntsb/FTW00LA096.md): Siai-Marchetti S.205/22R · Rayville, LA · Accident · No injuries · Limited investigation · Final report · Mar 14, 2000 · N2832W · Substantial damage
  > The loss of engine power for an undetermined reason, which resulted in a forced landing. A factor was the dark night light condition.
- [NTSB ANC99LA082](https://openairdocs.org/ntsb/ANC99LA082.md): Maule M-4-220C · Mcgrath, AK · Accident · No injuries · Limited investigation · Final report · Jun 24, 1999 · N40677 · Substantial damage
  > A separation of the number 4 engine cylinder, and a fracture of the number 4 engine connecting rod.
- [NTSB SEA98FA090](https://openairdocs.org/ntsb/SEA98FA090.md): Maule M-5-220C · Kettle Falls, WA · Accident · 2 fatal · Field investigation · Final report · Jun 6, 1998 · N16CB · Destroyed
  > The pilot's failure to maintain terrain clearance. A factor was an attempt to perform aerobatics at low altitude.
- [NTSB MIA97LA038](https://openairdocs.org/ntsb/MIA97LA038.md): Bell 47G · Lantana, FL · Accident · Minor injuries · Limited investigation · Final report · Dec 15, 1996 · N1200Z · Destroyed
  > an undetermined throttle problem, which resulted in a stuck (binding) throttle; and inadequate remedial action by the pilot, which led to a hard landing and subsequent nose over.
- [NTSB MIA96LA197](https://openairdocs.org/ntsb/MIA96LA197.md): Bell 47D1G · West Boca Raton, FL · Accident · No injuries · Limited investigation · Final report · Jul 30, 1996 · N1200Z · Substantial damage
  > Failure of the pilot to apply carburetor heat following a loss of engine power due to inadequate altitude over a populated area. Contributing to the accident was the encounter with conditions favorable for carburetor icing.
- [NTSB ATL96LA106](https://openairdocs.org/ntsb/ATL96LA106.md): Bell 47G · Bartow, FL · Accident · Minor injuries · Limited investigation · Final report · Jul 9, 1996 · N6356 · Destroyed
  > the pilot's inadequate visual lookout, and his failure to maintain ground clearance, while maneuvering to avoid a collision with a utility line.
- [NTSB SEA95LA063](https://openairdocs.org/ntsb/SEA95LA063.md): Hiller UH-12C · Bonners Ferry, ID · Accident · No injuries · Limited investigation · Final report · Mar 7, 1995 · N222TE · Substantial damage
  > Rotor RPM was not maintained. Factors to the accident were: inadequate in flight planning/decision and suitable terrain was not available.
- [NTSB FTW94LA002](https://openairdocs.org/ntsb/FTW94LA002.md): Maule M-5-200C · Watkins, CO · Accident · No injuries · Limited investigation · Final report · Oct 3, 1993 · N16CB · Substantial damage
  > The pilot's loss of directional control resulting in the inadvertent ground loop. A factor was the instructor's failure to take remedial action on a timely manner.
- [NTSB DEN93LA028](https://openairdocs.org/ntsb/DEN93LA028.md): Maule M-5-220C · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Feb 28, 1993 · N16CB · Substantial damage
  > Failure by the pilot to maintain control of the aircraft. A factor was: lack of experience in type of aircraft.
- [NTSB ATL90DKJ07](https://openairdocs.org/ntsb/ATL90DKJ07.md): Bell-Continental Copters 47G · Clayhatchee, AL · Accident · Serious injuries · Final report · Jul 27, 1990 · N7153 · Substantial damage
  > Failure of the engine magneto(s). The lack of suitable terrain (trees) in the emergency landing area was a related factor.
- [NTSB LAX86LA277](https://openairdocs.org/ntsb/LAX86LA277.md): Hiller UH-12C · Garberville, CA · Accident · No injuries · Limited investigation · Final report · Jul 2, 1986 · N26186 · Substantial damage
  > The student plt had just taken off on a training x-country flt when the main rotor tachometer needle decreased below the engine tachometer needle. He turned the helicopter to return to the arpt but was unable to maintain altitude and landed hard in rough…
- [NTSB LAX84LA181](https://openairdocs.org/ntsb/LAX84LA181.md): Bellanca 14-13-2 · Rialto, CA · Accident · Minor injuries · Limited investigation · Final report · Feb 17, 1984 · N74490 · Substantial damage
  > During the initial climb after takeoff, the eng lost power. The plt then made a wheels-up landing on rough terrain & the acft was damaged. An exam revealed that the left fuel tank was empty & the right tank was full. The plt reported that he may have taken…
- [NTSB SEA82FA111](https://openairdocs.org/ntsb/SEA82FA111.md): Cessna 172F · Oxbow, OR · Accident · 4 fatal · Field investigation · Final report · Jul 15, 1982 · N8230U · Destroyed
  > During the final approach the aircraft was observed to descend to approximately 50 feet above the river and then execute a pullup and begin a left turn to either reenter a left downwind or reverse the direction of landing. The pilot lost control, the left…
- [NTSB LAX81FVW17](https://openairdocs.org/ntsb/LAX81FVW17.md): Hiller Acft UH-12B · Las Vegas, NV · Accident · No injuries · Closed · Aug 22, 1981 · N94525 · Substantial damage
- [NTSB ATL81FKW02](https://openairdocs.org/ntsb/ATL81FKW02.md): Bell 47G · Clarksville, TN · Accident · Minor injuries · Closed · Oct 8, 1980 · N64877 · Substantial damage
- [NTSB SEA80DYE47](https://openairdocs.org/ntsb/SEA80DYE47.md): Coot B · Kelso, WA · Accident · 2 fatal · Closed · Jul 26, 1980 · N7141 · Destroyed
- [NTSB MIA79DKJ57](https://openairdocs.org/ntsb/MIA79DKJ57.md): Bell 47-D1 · Enterprise, AL · Accident · No injuries · Closed · Jul 29, 1979 · N36015 · Substantial damage
- [NTSB CHI79FEM21](https://openairdocs.org/ntsb/CHI79FEM21.md): Bell 47D-1 · Middleville, MI · Accident · No injuries · Closed · May 19, 1979 · N64580 · Substantial damage
- [NTSB LAX79DUJ30](https://openairdocs.org/ntsb/LAX79DUJ30.md): Maule M4220C · Pearce, AZ · Accident · Minor injuries · Closed · Jan 1, 1979 · N3ML · Substantial damage
- [NTSB SEA78DYM44](https://openairdocs.org/ntsb/SEA78DYM44.md): Maule M5220C · Enterprise, OR · Accident · Serious injuries · Closed · Jul 8, 1978 · N62014 · Substantial damage
- [NTSB CHI77FEM34](https://openairdocs.org/ntsb/CHI77FEM34.md): Bell 47D · Byron Center, MI · Accident · Serious injuries · Closed · Jul 21, 1977 · N64580 · Substantial damage
- [NTSB FTW77DPG50](https://openairdocs.org/ntsb/FTW77DPG50.md): Bell 47G · Weiwer, AR · Accident · No injuries · Closed · Jun 24, 1977 · N64877 · Substantial damage
- [NTSB SEA77FYE24](https://openairdocs.org/ntsb/SEA77FYE24.md): Hiller Acft 12C · Mt Vernon, WA · Accident · Serious injuries · Closed · Jun 17, 1977 · N5330V · Destroyed
- [NTSB DEN77FQA31](https://openairdocs.org/ntsb/DEN77FQA31.md): Maule M-4 · Santa Fe, NM · Accident · No injuries · Closed · Apr 28, 1977 · N2063U · Substantial damage
- [NTSB MKC77DCQ13](https://openairdocs.org/ntsb/MKC77DCQ13.md): Maule M-4 · Coldwater, KS · Accident · No injuries · Closed · Jan 3, 1977 · N40303 · Substantial damage
- [NTSB OAK77DXQ02](https://openairdocs.org/ntsb/OAK77DXQ02.md): Maule M5 · Battle Mountn, NV · Accident · No injuries · Closed · Nov 24, 1976 · N51602 · Substantial damage
- [NTSB FTW76DPG72](https://openairdocs.org/ntsb/FTW76DPG72.md): Bell 47G-2 · Beedeville, AR · Accident · No injuries · Closed · Jul 1, 1976 · N64877 · Substantial damage
- [NTSB ANC76FAA26](https://openairdocs.org/ntsb/ANC76FAA26.md): Cessna 170B · Fairbanks, AK · Accident · No injuries · Closed · Mar 7, 1976 · N8047A · Substantial damage
- [NTSB ANC76DAA15](https://openairdocs.org/ntsb/ANC76DAA15.md): Cessna 170B · Fairbanks, AK · Accident · Serious injuries · Closed · Sep 10, 1975 · N8047A · No damage
- [NTSB DEN75DTC03](https://openairdocs.org/ntsb/DEN75DTC03.md): Maule M-4 · Gillette, WY · Accident · No injuries · Closed · Jul 4, 1974 · N2054U · Substantial damage
- [NTSB LAX74AL057](https://openairdocs.org/ntsb/LAX74AL057.md): Bell 47D1 · Westminster, CA · Accident · 2 fatal · Closed · Jan 28, 1974 · N74084 · Destroyed
- [NTSB NYC74FFJ18](https://openairdocs.org/ntsb/NYC74FFJ18.md): Hiller Acft UH-12B · Dansville, NY · Accident · Minor injuries · Closed · Nov 6, 1973 · N33616 · Substantial damage
- [NTSB OAK74FVD14](https://openairdocs.org/ntsb/OAK74FVD14.md): Hiller Acft UH-12C · Brentwood, CA · Accident · No injuries · Closed · Sep 14, 1973 · N5330V · Substantial damage
- [NTSB OAK73DVG61](https://openairdocs.org/ntsb/OAK73DVG61.md): Stinson 108-2 · Weed, CA · Accident · No injuries · Closed · May 7, 1973 · N9529K · Substantial damage
- [NTSB CHI72DEE25](https://openairdocs.org/ntsb/CHI72DEE25.md): Siai-Marche S205 · Northbrook, IL · Accident · No injuries · Closed · Aug 30, 1971 · N2832W · Substantial damage
- [NTSB CHI71FBJ69](https://openairdocs.org/ntsb/CHI71FBJ69.md): Maule M-4220 · Midland, MI · Accident · No injuries · Closed · Mar 30, 1971 · N2063U · Substantial damage
- [NTSB MIA71FLD55](https://openairdocs.org/ntsb/MIA71FLD55.md): Cessna 172 · Lakeland, FL · Accident · Minor injuries · Closed · Mar 27, 1971 · N8313B · Substantial damage
- [NTSB OAK71DVM12](https://openairdocs.org/ntsb/OAK71DVM12.md): Hiller Acft UH-12C · Castroville, CA · Accident · No injuries · Closed · Aug 28, 1970 · N5330V · Substantial damage

Next page: https://openairdocs.org/ntsb.md?engine=27020&page=2

## 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 ('27020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27020

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