Fatal NTSB investigations: Franklin 6V4 series

13 cases on aircraft whose registry engine model is Franklin 6V4 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

19672026

Fatal NTSB investigations: Franklin 6V4 series per year, 1967–2026: 13 cases
1967	1
1969	1
1976	1
1980	2
1984	1
1986	1
1988	1
1990	1
1994	1
1995	1
1997	1
2001	1

Where

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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."highestInjuryLevel" = 'Fatal' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033')) 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.\"highestInjuryLevel\" = 'Fatal'
    AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033'))
  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."highestInjuryLevel" = 'Fatal'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033'))
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 CHI01FA231Accident · 2 fatalField investigationFinal reportWorld Helicopters 47D1 · Ballard, MOThe pilot's improper preflight planning which resulted in fuel exhaustion, and the pilot's subsequent improper autorotation.Jul 22, 2001 · N17301 · Destroyed NTSB MIA97FA248Accident · 2 fatalField investigationFinal reportBell 47G · Saluda, SCin-flight collision with a tree, for undetermined reason(s).Sep 19, 1997 · N70747 · Destroyed NTSB LAX96FA045Accident · 2 fatalField investigationFinal reportBell 47D1 · Shafter, CAthe pilot misjudged the altitude and ground clearance while performing an unwarranted low altitude flight maneuver.Nov 12, 1995 · N78900 · Destroyed NTSB MIA94FA125Accident · 2 fatalField investigationFinal reportBell 47D1 · Marathon, FLSeparation of the tail rotor gearbox and tail rotor blades for an undetermined reason. Factors related to the accident were: failure of maintenance personnel to follow the proper maintenance procedure after a previous tail rotor strike, and failure to conduct…Apr 22, 1994 · N9660 · Destroyed NTSB NYC90DGM02Accident · 1 fatalFinal reportBell 47D1 · Meadville, PAThe pilot's failure to see and avoid the power lines.Jun 22, 1990 · N310A · Destroyed NTSB MKC88FA054Accident · 1 fatalField investigationFinal reportBell 47D1 · Nixa, MODuring the process of moving the helicopter from the hangar the right skid slipped off the concrete helipad and became stuck in the mud. The pilot attempted to dislodge the skid by bringing the aircraft to a hover. The left skid became airborne and contacted…Feb 21, 1988 · N7735 · Destroyed NTSB ATL86FEI07Accident · 1 fatalFinal reportBell 47G2 · Lisbon, OHThe aerial application helicopter was being serviced by a chemical truck that was parked adjacent to the acft. The acft engine was at high idle with the main rotor turning at 250 RPM. The ground crewman jumped off the side of the chemical truck into the main…Jun 26, 1986 · N984B · Minor damage NTSB MIA84FA058Accident · 1 fatalField investigationFinal reportHiller UH-12C · San Juan, PRA performer fell from a trapeze rigged below the helicopter while it was hovering at about 150 ft AGL. The FAA had not authorized the modification to the acft. The plt was not certified for external load operations. The performer reportedly had not done this…Jan 12, 1984 · N5317V · No damage NTSB CHI80FEC26Accident · 1 fatalClosedBell 47D1 · Munith, MIJul 30, 1980 · N3656F · Substantial damage NTSB FTW80FPM14Accident · 1 fatalClosedBell 47G · Calvin, OKJul 16, 1980 · N16657 · Destroyed NTSB ANC76DAH16Accident · 1 fatalClosedBell 47D-1 · Birchwood, AKMay 25, 1976 · N117B · Substantial damage NTSB NYC69F0450Accident · 1 fatalClosedBell 47G · Geneseo, NYMay 5, 1969 · N1273 · Destroyed NTSB OAK67A0071Accident · 3 fatalClosedBell 47D1 · Martinez, CAMar 25, 1967 · N74123 · Destroyed