Skip to content

Final NTSB investigations: Franklin 6A&6V335 series

60 cases on aircraft whose registry engine model is Franklin 6A&6V335 series. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.

Defining event

Finding

Phase of flight

Aircraft model

Cases per year

19642026

Final NTSB investigations: Franklin 6A&6V335 series per year, 1964–2026: 60 cases
1964	2
1965	2
1966	2
1969	4
1970	1
1971	3
1973	3
1974	2
1975	1
1976	3
1977	5
1978	1
1979	3
1980	2
1981	1
1982	1
1984	1
1986	1
1990	1
1993	2
1995	1
1996	3
1998	1
1999	1
2000	1
2001	1
2003	2
2006	1
2007	2
2010	1
2012	1
2014	1
2015	1
2018	1
2025	1

Where

Latest cases

Query with 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."completionStatus" = 'Completed' AND 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

duckdb -csv -c "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.\"completionStatus\" = 'Completed'
    AND 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"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

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."completionStatus" = 'Completed'
  AND 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

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

NTSB WPR25LA196Accident · No injuriesClass 4 · LimitedFinal reportMaule M-4-220C · Pendleton, ORThe pilot’s failure to maintain directional control during landing, in gusting crosswind conditions.Jun 24, 2025 · N2051U · Substantial damage NTSB GAA18CA119Accident · No injuriesData collectionFinal reportCessna 172 · Juneau, AKThe pilot’s selection of unsuitable terrain for landing, which resulted in a nose-over.Feb 5, 2018 · N271BJ · Substantial damage NTSB GAA15CA067Accident · No injuriesData collectionFinal reportMaule M 4-220C · Rigby, IDThe pilot's failure to maintain directional control of the airplane during landing roll.May 11, 2015 · N2058U · Substantial damage NTSB WPR14FA252Accident · 1 fatalField investigationFinal reportCessna 175 · Moab, UTThe 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.Jun 18, 2014 · N7043M · Destroyed NTSB WPR13LA050Accident · 1 fatalLimited investigationFinal reportSater Coot A-Amphib · San Andreas, CAThe 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.Nov 23, 2012 · N8VS · Substantial damage NTSB CEN10CA195Accident · No injuriesData collectionFinal reportCessna 175 · Eveleth, MNThe pilot's selection of unsuitable terrain for landing.Apr 6, 2010 · N9266B · Substantial damage NTSB MIA07LA089Accident · Serious injuriesLimited investigationFinal reportHiller UH-12C · Plant City, FLThe loss of engine power due to a magneto impulse coupling failure for undetermined reasons.Apr 27, 2007 · N92993 · Substantial damage NTSB ANC07LA026Accident · No injuriesLimited investigationFinal reportCessna 175 · Bunnell, FLThe 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.Mar 31, 2007 · N8092T · Substantial damage NTSB ATL06LA130Accident · Minor injuriesLimited investigationFinal reportBellanca 14-13-2 · Ellijay, GAA 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.Sep 25, 2006 · N74475 · Substantial damage NTSB LAX03CA274Accident · Serious injuriesData collectionFinal reportBell 47D1 · Chino, CAthe 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.Sep 2, 2003 · N64580 · Substantial damage NTSB DEN03FA113Accident · 1 fatalField investigationFinal reportMattison Starduster Too · Ellicott, COthe 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…Jun 28, 2003 · N80T · Destroyed NTSB LAX01FA236Accident · No injuriesField investigationFinal reportBell 47D-1 · Riverside, CAThe 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.Jul 6, 2001 · N64580 · Substantial damage NTSB FTW00LA096Accident · No injuriesLimited investigationFinal reportSiai-Marchetti S.205/22R · Rayville, LAThe loss of engine power for an undetermined reason, which resulted in a forced landing. A factor was the dark night light condition.Mar 14, 2000 · N2832W · Substantial damage NTSB ANC99LA082Accident · No injuriesLimited investigationFinal reportMaule M-4-220C · Mcgrath, AKA separation of the number 4 engine cylinder, and a fracture of the number 4 engine connecting rod.Jun 24, 1999 · N40677 · Substantial damage NTSB SEA98FA090Accident · 2 fatalField investigationFinal reportMaule M-5-220C · Kettle Falls, WAThe pilot's failure to maintain terrain clearance. A factor was an attempt to perform aerobatics at low altitude.Jun 6, 1998 · N16CB · Destroyed NTSB MIA97LA038Accident · Minor injuriesLimited investigationFinal reportBell 47G · Lantana, FLan 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.Dec 15, 1996 · N1200Z · Destroyed NTSB MIA96LA197Accident · No injuriesLimited investigationFinal reportBell 47D1G · West Boca Raton, FLFailure 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.Jul 30, 1996 · N1200Z · Substantial damage NTSB ATL96LA106Accident · Minor injuriesLimited investigationFinal reportBell 47G · Bartow, FLthe pilot's inadequate visual lookout, and his failure to maintain ground clearance, while maneuvering to avoid a collision with a utility line.Jul 9, 1996 · N6356 · Destroyed NTSB SEA95LA063Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Bonners Ferry, IDRotor RPM was not maintained. Factors to the accident were: inadequate in flight planning/decision and suitable terrain was not available.Mar 7, 1995 · N222TE · Substantial damage NTSB FTW94LA002Accident · No injuriesLimited investigationFinal reportMaule M-5-200C · Watkins, COThe 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.Oct 3, 1993 · N16CB · Substantial damage NTSB DEN93LA028Accident · No injuriesLimited investigationFinal reportMaule M-5-220C · Englewood, COFailure by the pilot to maintain control of the aircraft. A factor was: lack of experience in type of aircraft.Feb 28, 1993 · N16CB · Substantial damage NTSB ATL90DKJ07Accident · Serious injuriesFinal reportBell-Continental Copters 47G · Clayhatchee, ALFailure of the engine magneto(s). The lack of suitable terrain (trees) in the emergency landing area was a related factor.Jul 27, 1990 · N7153 · Substantial damage NTSB LAX86LA277Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Garberville, CAThe 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…Jul 2, 1986 · N26186 · Substantial damage NTSB LAX84LA181Accident · Minor injuriesLimited investigationFinal reportBellanca 14-13-2 · Rialto, CADuring 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…Feb 17, 1984 · N74490 · Substantial damage NTSB SEA82FA111Accident · 4 fatalField investigationFinal reportCessna 172F · Oxbow, ORDuring 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…Jul 15, 1982 · N8230U · Destroyed NTSB LAX81FVW17Accident · No injuriesClosedHiller Acft UH-12B · Las Vegas, NVAug 22, 1981 · N94525 · Substantial damage NTSB ATL81FKW02Accident · Minor injuriesClosedBell 47G · Clarksville, TNOct 8, 1980 · N64877 · Substantial damage NTSB SEA80DYE47Accident · 2 fatalClosedCoot B · Kelso, WAJul 26, 1980 · N7141 · Destroyed NTSB MIA79DKJ57Accident · No injuriesClosedBell 47-D1 · Enterprise, ALJul 29, 1979 · N36015 · Substantial damage NTSB CHI79FEM21Accident · No injuriesClosedBell 47D-1 · Middleville, MIMay 19, 1979 · N64580 · Substantial damage NTSB LAX79DUJ30Accident · Minor injuriesClosedMaule M4220C · Pearce, AZJan 1, 1979 · N3ML · Substantial damage NTSB SEA78DYM44Accident · Serious injuriesClosedMaule M5220C · Enterprise, ORJul 8, 1978 · N62014 · Substantial damage NTSB CHI77FEM34Accident · Serious injuriesClosedBell 47D · Byron Center, MIJul 21, 1977 · N64580 · Substantial damage NTSB FTW77DPG50Accident · No injuriesClosedBell 47G · Weiwer, ARJun 24, 1977 · N64877 · Substantial damage NTSB SEA77FYE24Accident · Serious injuriesClosedHiller Acft 12C · Mt Vernon, WAJun 17, 1977 · N5330V · Destroyed NTSB DEN77FQA31Accident · No injuriesClosedMaule M-4 · Santa Fe, NMApr 28, 1977 · N2063U · Substantial damage NTSB MKC77DCQ13Accident · No injuriesClosedMaule M-4 · Coldwater, KSJan 3, 1977 · N40303 · Substantial damage NTSB OAK77DXQ02Accident · No injuriesClosedMaule M5 · Battle Mountn, NVNov 24, 1976 · N51602 · Substantial damage NTSB FTW76DPG72Accident · No injuriesClosedBell 47G-2 · Beedeville, ARJul 1, 1976 · N64877 · Substantial damage NTSB ANC76FAA26Accident · No injuriesClosedCessna 170B · Fairbanks, AKMar 7, 1976 · N8047A · Substantial damage NTSB ANC76DAA15Accident · Serious injuriesClosedCessna 170B · Fairbanks, AKSep 10, 1975 · N8047A · No damage NTSB DEN75DTC03Accident · No injuriesClosedMaule M-4 · Gillette, WYJul 4, 1974 · N2054U · Substantial damage NTSB LAX74AL057Accident · 2 fatalClosedBell 47D1 · Westminster, CAJan 28, 1974 · N74084 · Destroyed NTSB NYC74FFJ18Accident · Minor injuriesClosedHiller Acft UH-12B · Dansville, NYNov 6, 1973 · N33616 · Substantial damage NTSB OAK74FVD14Accident · No injuriesClosedHiller Acft UH-12C · Brentwood, CASep 14, 1973 · N5330V · Substantial damage NTSB OAK73DVG61Accident · No injuriesClosedStinson 108-2 · Weed, CAMay 7, 1973 · N9529K · Substantial damage NTSB CHI72DEE25Accident · No injuriesClosedSiai-Marche S205 · Northbrook, ILAug 30, 1971 · N2832W · Substantial damage NTSB CHI71FBJ69Accident · No injuriesClosedMaule M-4220 · Midland, MIMar 30, 1971 · N2063U · Substantial damage NTSB MIA71FLD55Accident · Minor injuriesClosedCessna 172 · Lakeland, FLMar 27, 1971 · N8313B · Substantial damage NTSB OAK71DVM12Accident · No injuriesClosedHiller Acft UH-12C · Castroville, CAAug 28, 1970 · N5330V · Substantial damage