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Final NTSB investigations: Franklin 6V-335 series

35 cases on aircraft whose registry engine model is Franklin 6V-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

19642026

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 ('27039')) 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 ('27039'))
  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 ('27039'))
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 CEN23LA383Accident · No injuriesClass 4 · LimitedFinal reportHiller UH-12A · Mosby, MOThe pilot’s failure to maintain adequate rotor rpm which resulted in a loss of control and impact with terrain.Aug 27, 2023 · N8178H · Substantial damage NTSB ERA22LA039Accident · No injuriesClass 3 · LimitedFinal reportBell 47D1 · Zelienople, PAA total loss of engine power for reasons that could not be determined.Oct 31, 2021 · N132BR · Substantial damage NTSB CEN21LA124Accident · No injuriesClass 4 · LimitedFinal reportHiller UH12C · Lafayette, INThe 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.Jan 12, 2021 · N552DR · Substantial damage NTSB CHI08LA151Accident · No injuriesLimited investigationFinal reportBell 47D1 · Carrollton, OHThe airframe vibration for an undetermined reason.Jun 1, 2008 · N74898 · Substantial damage NTSB DEN03LA051Accident · Minor injuriesLimited investigationFinal reportPanzl PAN · Vernal, UTthe 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.Mar 18, 2003 · N11ZL · Substantial damage NTSB MIA93FA121Accident · 2 fatalField investigationFinal reportBell 47-G · Parker, FLthe 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.May 16, 1993 · N970B · Destroyed NTSB FTW93LA047Accident · No injuriesLimited investigationFinal reportHiller UH12B · Justin, TXFailure of the main rotor system for undetermined reasons. A factor was the lack of suitable terrain at the pilot's disposal.Dec 2, 1992 · N1048P · Substantial damage NTSB BFO92LA102Accident · No injuriesLimited investigationFinal reportBell 47G · Southwick, MAImproper adjustment of the stabilizer control system by maintenance personnel.Jul 15, 1992 · N3109G · Substantial damage NTSB NYC91LA189Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Westfield, MAThe pilot's failure to refuel resulting in a power failure due to fuel exhaustion, and subsequent forced landing in unsuitable terrain.Jul 27, 1991 · N62246 · Substantial damage NTSB FTW91LA126Accident · No injuriesLimited investigationFinal reportBell 47D-1 · Provencal, LAFuel leakage from the fuel drain valve. A factor was the inaccessibility of suitable terrain for fored landing.Jul 24, 1991 · N3575 · Substantial damage NTSB NYC89LA025Accident · Minor injuriesLimited investigationFinal reportBell 47G · Champion, NYThe pilot was unable to sustain flight due to a severe downdraft accompanied by a power loss at a low altitude.Nov 10, 1988 · N2AR · Substantial damage NTSB ATL88LA232Accident · Serious injuriesLimited investigationFinal reportHiller UH-12A · Paducah, KYAfter 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…Aug 20, 1988 · N4828E · Substantial damage NTSB FTW87LA107Accident · No injuriesLimited investigationFinal reportBell 47D1 · Ardmore, OKThe 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…Apr 25, 1987 · N3575 · Substantial damage NTSB LAX85LA309Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Durham, CAThe 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…Jul 7, 1985 · N1048P · Substantial damage NTSB NYC85FGM02Accident · Serious injuriesFinal reportHiller UH-12B · Butler, PAAfter 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…Nov 15, 1984 · N17129 · Substantial damage NTSB MKC84LA102Accident · No injuriesLimited investigationFinal reportHiller UH-12B · Ulysses, KSThe 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…Mar 15, 1984 · N1021Y · Substantial damage NTSB LAX84FA106Accident · No injuriesField investigationFinal reportHiller UH-12A · Van Nuys, CAThe 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…Dec 16, 1983 · N8108H · Substantial damage NTSB NYC81DFJ06Accident · Minor injuriesClosedHiller UH-12B · Jamestown, NYFeb 27, 1981 · N90803 · Substantial damage NTSB MIA80FA112Accident · 1 fatalClosedCambell 47-D1G · Panama City, FLSep 22, 1980 · N3109G · Destroyed NTSB FTW79DPJ37Accident · No injuriesClosedBell 47D1 · Ardmore, OKSep 12, 1979 · N3575 · Substantial damage NTSB MIA79DKT30Accident · No injuriesClosedBell 47G · Opa Locka, FLJan 7, 1979 · N2AR · Destroyed NTSB MIA77DLA38Accident · Minor injuriesClosedBell 47D1 · Panama City, FLJul 18, 1977 · N3109G · Substantial damage NTSB MIA77DLA37Accident · No injuriesClosedBell 47D1G · Panama Cy Bch, FLJun 17, 1977 · N3109G · Substantial damage NTSB SEA77DYM34Accident · Serious injuriesClosedHiller Acft UH-12C · Albany, ORMay 28, 1977 · N8108H · Destroyed NTSB MIA77DKJ37Accident · No injuriesClosedBell 47D1 · Ozark, ALMay 15, 1977 · N74898 · Substantial damage NTSB MIA77DKG08Accident · No injuriesClosedBell 47D1 · Vanceville, GADec 12, 1976 · N3575 · Substantial damage NTSB MIA76DKJ53Accident · No injuriesClosedBell 47D1 · Enterprise, ALMar 6, 1976 · N3109G · Substantial damage NTSB SEA76FYC20Accident · No injuriesClosedHiller Acft UH-12B · Brownsville, ORSep 20, 1975 · N8108H · Substantial damage NTSB MIA75FKJ54Accident · Serious injuriesClosedBell 47D1-G · Abbeville, ALApr 7, 1975 · N3109G · Destroyed NTSB MIA72DLA26Accident · Minor injuriesClosedBell 47D1 · Milton, FLDec 17, 1971 · N3109G · Substantial damage NTSB SEA71FYC42Accident · 1 fatalClosedHiller UH12A · Brooks, ORJun 11, 1971 · N8178H · Destroyed NTSB MKC68A0049Accident · No injuriesClosedBell 47G · Onawa, IAFeb 6, 1968 · N970B · Destroyed NTSB OAK68A0036Accident · No injuriesClosedHiller UH-12C · Riverdale, CAOct 15, 1967 · N5321V · Substantial damage NTSB MIA66A0006Accident · No injuriesClosedBell 47-D1 · Panama City, FLJul 11, 1965 · N3109G · Substantial damage NTSB UNK64X4188Accident · No injuriesClosedBell 47G · Bakersfield, CASep 27, 1964 · N970B · Substantial damage