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NTSB investigations: Franklin 6VS-335 series

70 cases on aircraft whose registry engine model is Franklin 6VS-335 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

19652026

NTSB investigations: Franklin 6VS-335 series per year, 1965–2026: 70 cases
1965	5
1966	4
1967	1
1968	2
1969	4
1970	4
1971	3
1972	1
1973	5
1974	3
1975	1
1976	2
1977	3
1978	1
1979	3
1980	2
1981	2
1982	1
1983	4
1984	1
1985	2
1986	2
1987	1
1988	1
1990	1
1992	1
1994	4
1995	1
1999	1
2001	1
2005	1
2007	1
2021	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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27040')) 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27040'))
  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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27040'))
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 ERA22LA069Accident · Serious injuriesClass 4 · LimitedFinal reportK Copters 47G-2 · Lancaster, PAThe flight instructor’s failure to ensure a positive transfer of aircraft control, which resulted in a loss of control and collision with terrain.Nov 20, 2021 · N210JB · Substantial damage NTSB ATL07LA045Accident · 2 fatalLimited investigationFinal reportHiller UH-12A · Bethlehem, GAThe pilot's failure to maintain adequate rotor rpm, which resulted in an attempted autorotation and in-flight collision with trees. Contributing to the severity of the accident was the pilot exceeding the helicopters takeoff capability.Feb 24, 2007 · N8180H · Substantial damage NTSB DFW05CA235Accident · Serious injuriesData collectionFinal reportBell 47G · Swifton, ARThe pilot's failure to maintain clearance with the power lines. A contributing factor was sun glare.Sep 10, 2005 · N862Z · Substantial damage NTSB MIA01LA085Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Whitesburg, GAThe improper emergency procedure performed by the pilot due to his electing to perform a run-on landing resulting in excessive airspeed at touchdown and subsequent roll-over following ground contact with grass. A contributing factor was the inadequate…Feb 24, 2001 · N5307V · Substantial damage NTSB NYC99LA146Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Delphos, OHA blocked fuel line, from an unknown object, that resulted in fuel starvation, and total loss of engine power. A factor in the accident was the pilot's failure to maintain rotor rpm during the autorotation.Jun 16, 1999 · N57CR · Substantial damage NTSB SEA95LA220Accident · No injuriesLimited investigationFinal reportHiller UH-12A · Bonners Ferry, IDThe flight instructor's misjudging his flare during a simulated autorotation.Sep 17, 1995 · N8180H · Substantial damage NTSB SEA95LA022Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Twisp, WAAn unexplained loss of power and the student pilot's delayed application of collective during the landing flare.Nov 28, 1994 · N54594 · Substantial damage NTSB LAX94FA354Accident · 4 fatalField investigationFinal reportStinson 108-3 · Shelter Cove, CAInadequate preflight by the pilot, which resulted in fuel starvation and loss of engine power, improper (or delayed) positioning of the fuel selector to the fullest tank, and failure of the pilot to maintain adequate airspeed, while maneuvering for a forced…Sep 5, 1994 · N6446M · Destroyed NTSB FTW94LA147Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Crystal Beach, TXThe pilot's improper autorotation touchdown, which rsulted in the hard landing. A factor was the power loss due to water contaminated fuel.May 8, 1994 · N6417V · Substantial damage NTSB FTW94LA125Accident · Minor injuriesLimited investigationFinal reportHiller UH-12 · Alvin, TXThe pilot's failure to maintain rotor speed, delay of the flare, and the improper touchdown. A factor was the loss of engine power for undetermined reasons.Apr 16, 1994 · N41319 · Substantial damage NTSB ATL92LA131Accident · No injuriesLimited investigationFinal reportBell 47D1 · Centre, ALThe pilot's inadequate visual lookout, resulting in a collision with a wire.Jun 25, 1992 · N68632 · Substantial damage NTSB FTW91LA007Accident · No injuriesLimited investigationFinal reportBell 47G · Grand Prairie, TXThe pilot's inadequate compensation for the existing tailwind conditions and his failure to maintain rotor RPM.Oct 20, 1990 · N1071Z · Substantial damage NTSB MKC89LA016Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Davenport, IAWhile demonstrating an autorotation touchdown, a tailboom strike was experienced. Damage was incurred to the tailboom, the tail rotor drive shaft, and one main rotor blade. The CFI said everthing felt normal during touchdown and believed the soft terrain…Oct 26, 1988 · N57FD · Substantial damage NTSB NYC87LA129Accident · No injuriesLimited investigationFinal reportBell 47G · Bethel, PAThe student pilot lost directional control of the helicopter and as the instructor pilot attempted to regain control, the main rotor blades struck the ground causing substantial damage to the aircraft.Apr 20, 1987 · N59321 · Substantial damage NTSB SEA86FA139Accident · Serious injuriesField investigationFinal reportHiller UH12B · Rathdrum, IDThe plt reported noticing the fuel gage was nearing empty shortly before the eng quit. The acft crashed during an attempted forced landing on a road. The plt stated he was flying the acft to his residence where it was based. Investigation revealed little fuel…Jun 8, 1986 · N41319 · Destroyed NTSB MKC86FA082Accident · Serious injuriesField investigationFinal reportHiller UH-12B · Fall River, KSThe helicopter flew through the tops of trees next to a plowed field and impacted almost straight down in the plowed field and nosed over to the inverted position. The pilot stated that he had intended to land in the field and allowed the airspeed and main…Apr 7, 1986 · N5307V · Destroyed NTSB MKC85FA114Accident · Serious injuriesField investigationFinal reportBell OH-13E · Jonesboro, ARThe plt reported that the eng quit due to fuel exhaustion. He attempted to land straight ahead on soft terrain, but the helicopter rolled over. During the accident sequence, the main rotor blades struck the tail boom & scattered parts ahead of & to the rgt of…May 29, 1985 · N29WL · Substantial damage NTSB NYC85FNC03Accident · Serious injuriesFinal reportBell 47H-1 · Guilford, VTThe helicopter crashed after losing rotor RPM during a max performance takeoff from a confined area at a private landing area. The plt had added 10 gals of fuel and he was carrying a passenger. The plt said he ahd taken off from this area before with no…Apr 28, 1985 · N2827B · Destroyed NTSB CHI84LA211Accident · Serious injuriesLimited investigationFinal reportBell 47G · Drummond Island, MIThe plt had previously made 2 local flts, during which, he practiced water landings & takeoffs as well as other maneuvers. On the 3rd flt, he made several water takeoffs & landings. Then while on a landing, the helicopter began to roll quickly to the right.…May 28, 1984 · N10174 · Substantial damage NTSB FTW84LA099Accident · No injuriesLimited investigationFinal reportHiller UH-12C · Imperial, TXThe plt reported that when he was in cruise flt at 300 ft AGL, a sudden violent shudder went thru the whole helicopter, then the shudder stopped. He noted no change in the flit characteristics or eng power. The plt elected to make a precautionary landing by…Dec 16, 1983 · N63MC · Substantial damage NTSB ATL83LA315Accident · Minor injuriesLimited investigationFinal reportBell 47D1 · Moultrie, GAAfter completing a swath run, the plt pulled up, made a turn, then started a let down for another pass. As he increased power, the eng RPM went from 3000 to 3100. At the same time, the plt heard a whining noise and noted that the rotor RPM was decreasing. The…Aug 6, 1983 · N68632 · Substantial damage NTSB SEA83LA132Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Jerome, IDThe acft was destroyed by fire after a forced landing due to pwr loss. The pilot stated that he was en route home after an aerial application mission when the engine lost power. He made an auto-rotation downwind and after exiting the acft noticed an engine…Jun 23, 1983 · N245C · Substantial damage NTSB NYC83FHM01Accident · Minor injuriesFinal reportBell 47G · Plainsboro, NJThe acft collided with the ground after a tail rotor drive shaft failed. The plt lost tail rotor control during an aerial application maneuver. The metallurgist report of examination and discovery of fatigue fracture after the accident is a part of the…May 15, 1983 · N6597D · Destroyed NTSB FTW82FPG11Accident · 1 fatalFinal reportMoore Bell 47D1 · Amagon, ARThe purpose of the flight was to test the aerial spray equipment. After starting and warming the engine, the pilot took off, flew about 1/4 mi south, then flew north. A motorist stated that he saw black smoke coming from the helicopter. Two teen-agers heard…May 8, 1982 · N45867 · Destroyed NTSB DEN82FTM04Accident · Minor injuriesClosedHiller UH12C · Logan, UTNov 16, 1981 · N6417V · Substantial damage NTSB FTW81FPD31Accident · No injuriesClosedHiller Acft UH-12C · Burleson, TXJul 15, 1981 · N57CR · Substantial damage NTSB LAX81FUG06Accident · No injuriesClosedHiller Acft UH-12B · Rialto, CADec 25, 1980 · N94731 · Substantial damage NTSB LAX80FA104Accident · No injuriesClosedBell 47G · Long Beach, CAJun 11, 1980 · N8270E · Substantial damage NTSB LAX79DUM13Accident · No injuriesClosedBell 47G-2A · Fallbrook, CAApr 24, 1979 · N73872 · Substantial damage NTSB MIA79FLD57Accident · No injuriesClosedBell 47-D1 · Clearwater, FLApr 13, 1979 · N68632 · Destroyed NTSB OAK79FVD11Accident · No injuriesClosedHiller UH-12B · Brentwood, CAFeb 25, 1979 · N94731 · Substantial damage NTSB NYC78FHM27Accident · No injuriesClosedHiller 12C · Neptune, NJAug 29, 1978 · N63MC · Substantial damage NTSB OAK77DVW31Accident · No injuriesClosedBell 47SG · Ash Springs, NVJun 25, 1977 · N979B · Substantial damage NTSB LAX77DVA16Accident · No injuriesClosedHiller Acft UH-12C · Terra Bella, CAJan 15, 1977 · N6417V · Substantial damage NTSB LAX77FUM12Accident · No injuriesClosedEL Tomcat 47G · San Diego, CAJan 13, 1977 · N73872 · Substantial damage NTSB NYC76FGT27Accident · No injuriesClosedBell 47D1 · Zion Grove, PAAug 18, 1976 · N919B · Substantial damage NTSB MIA76DKJ86Accident · No injuriesClosedBell 47D1 · Centre, ALJul 24, 1976 · N29WL · Destroyed NTSB MKC76FCD07Accident · Minor injuriesClosedBell H-13E · Collins, IAAug 30, 1975 · N29WL · Substantial damage NTSB CHI74AC096Accident · 1 fatalClosedHiller Acft UH-12B · Custar, OHJun 2, 1974 · N6744C · Destroyed NTSB CHI74FEM62Accident · No injuriesClosedEL Tomcat I · Belding, MIMay 29, 1974 · N73872 · Substantial damage NTSB IAD74FIA14Accident · No injuriesClosedBell 47D1 · Stephens City, VAMay 8, 1974 · N919B · Substantial damage NTSB MIA74FLA08Accident · No injuriesClosedBell 47D-1 · Destin, FLAug 5, 1973 · N6579D · Substantial damage NTSB CHI74FEA04Accident · Serious injuriesClosedBell 47G-3 · Dana, INJul 13, 1973 · N8416E · Substantial damage NTSB CHI73DEA37Accident · No injuriesClosedBell 47D-1 · Bloomfield, INJun 5, 1973 · N2794A · Destroyed NTSB FTW73DPJ20Accident · No injuriesClosedHiller UH-12B · Guymon, OKMay 28, 1973 · N6744C · Substantial damage NTSB MIA73FKT53Accident · Serious injuriesClosedBell 47G · Miami Beach, FLJan 22, 1973 · N864Z · Substantial damage NTSB SEA73DYA05Accident · Serious injuriesClosedBell 47G · Murtaugh, IDAug 6, 1972 · N1071Z · Substantial damage NTSB MIA72FKQ12Accident · No injuriesClosedBell 47D-1 · Mt Olive, MSAug 27, 1971 · N2794A · Substantial damage NTSB MKC72FCG11Accident · Minor injuriesClosedHiller UH-12A · Springfield, MOAug 11, 1971 · N4287C · Substantial damage NTSB CHI71DEI52Accident · No injuriesClosedBell 47D1 · Bloomdale, OHMay 27, 1971 · N68632 · Substantial damage