NTSB investigations: Franklin 6V4 series, TX

32 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.

Cases per year

19642026
NTSB investigations: Franklin 6V4 series, TX per year, 1964–2026: 32 cases
19642
19652
19671
19681
19692
19703
19715
19723
19734
19751
19761
19771
19811
19821
19841
19881
20171
20261

Latest cases

Query with SQL
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.\"eventStateOrRegion\" = 'TX' AND c.\"eventCountry\" = 'USA'
    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.

NTSB WPR26LA247Accident · Serious injuriesClass 4 · LimitedFinal reportBell 47G · Springtown, TXThe pilot’s failure to maintain clearance from trees while in a low hover.Jul 3, 2026 · N7985A · Substantial damageNTSB CEN17LA113Accident · Serious injuriesLimited investigationFinal reportBell-Transworld Helicopters 47D1 · Archer City, TXThe total loss of engine power due to fuel starvation, which resulted from the pilot’s inadvertent positioning of the mixture control to the “fuel cutoff” position.Feb 9, 2017 · N2875F · Substantial damageNTSB FTW89DPA03Accident · Serious injuriesFinal reportBell 47-D1 · Allen, TXUnqualified pilot's poor judgement in leveling the helicopter during the flare and contributing to this was his lack of total experience in this type aircraft.Dec 2, 1988 · N74124 · Substantial damageNTSB FTW85LA043Accident · No injuriesLimited investigationFinal reportBell 47D1 · Terlingua, TXShortly after the plt took off on a sight-seeing flt, the eng lost power when the helicopter was over rough terrain at about 200 ft AGL. During an autorotative landing, the helicopter rocked forward causing the main rotor blades to strike the tail boom.…Nov 4, 1984 · N93067 · Substantial damageNTSB FTW82DA073Accident · No injuriesFinal reportBell 47G · Dallas, TXThe pilot attempted to land on a narrow flatbed trailer. He stated that he encountered some buffeting from the wind funneling between two hangars. On his third attempt to position the helicopter on the trailer, the right skid slipped off. The main rotor…Feb 28, 1982 · N1773 · Substantial damageNTSB FTW81FA045Accident · Minor injuriesClosedBell 47D1 · Roanoke, TXFeb 10, 1981 · N9736Z · Substantial damageNTSB FTW77FRA13Accident · No injuriesClosedBell 47D1 · Houston, TXFeb 27, 1977 · N9736Z · Substantial damageNTSB FTW77FRG02Accident · Serious injuriesClosedBell 47G · Kerrville, TXOct 12, 1976 · N2772 · DestroyedNTSB FTW76FPA15Accident · No injuriesClosedBell 47D-1 · Irving, TXDec 7, 1975 · N5226 · Substantial damageNTSB FTW74DPD01Accident · No injuriesClosedHiller UH-12A · Dublin, TXJul 13, 1973 · N6448D · Substantial damageNTSB FTW73FPD37Accident · No injuriesClosedBell 47D1 · Decatur, TXMay 21, 1973 · N74121 · Substantial damageNTSB FTW73DPD34Accident · No injuriesClosedHiller Acft UH-12C · Justin, TXMay 14, 1973 · N5328V · DestroyedNTSB FTW73DRG66Accident · No injuriesClosedBell 47G · San Antonio, TXApr 4, 1973 · N2772 · Substantial damageNTSB FTW73DPD17Accident · No injuriesClosedHiller Acft UH-12C · Valley View, TXDec 23, 1972 · N5328V · Substantial damageNTSB FTW72FPD48Accident · No injuriesClosedBell 47H-1 · Graham, TXJun 23, 1972 · N4958E · DestroyedNTSB FTW72DPD40Accident · No injuriesClosedBell 47D1 · Glen Rose, TXMay 8, 1972 · N74121 · Substantial damageNTSB FTW72FPA09Accident · No injuriesClosedBell 47D1 · Carrollton, TXOct 24, 1971 · N7735 · Substantial damageNTSB FTW72FPA07Accident · No injuriesClosedHiller UH-12C · Lorena, TXOct 7, 1971 · N73875 · Substantial damageNTSB FTW72DPD18Accident · No injuriesClosedHiller UH12C · Grandview, TXSep 14, 1971 · N73875 · Substantial damageNTSB FTW72DPD09Accident · No injuriesClosedHiller UH12C · Roanoke, TXSep 5, 1971 · N5328V · Substantial damageNTSB FTW71FPD52Accident · No injuriesClosedHiller UH12B · Arlington, TXApr 28, 1971 · N10195 · DestroyedNTSB FTW70FPD05Accident · No injuriesClosedBell 47G · Fort Worth, TXMar 5, 1970 · N16657 · Substantial damageNTSB FTW70FPA07Accident · No injuriesClosedBell 47D1 · Howe, TXMar 4, 1970 · N74121 · Substantial damageNTSB FTW70FRG10Accident · No injuriesClosedBell 47D1 · Randolph Afb, TXFeb 14, 1970 · N4229A · Substantial damageNTSB FTW69F0497Accident · No injuriesClosedBell 47D1 · Powell, TXMay 13, 1969 · N7735 · Substantial damageNTSB FTW69F0491Accident · No injuriesClosedBell 47G · Fort Worth, TXMay 2, 1969 · N16657 · Substantial damageNTSB FTW69F0246Accident · No injuriesClosedBell 47H-1 · Houston, TXOct 5, 1968 · N996B · Substantial damageNTSB FTW68A0029Accident · No injuriesClosedBell 47D1 · Irving, TXSep 8, 1967 · N8116 · Substantial damageNTSB FTW65A0109Accident · No injuriesClosedHiller UH12B · Mcallen, TXMay 4, 1965 · N10195 · Substantial damageNTSB FTW65A0095Accident · No injuriesClosedHiller UH12B · San Antonio, TXMar 29, 1965 · N6448D · Substantial damageNTSB UNK65X1015Accident · No injuriesClosedHiller UH-12B · Pharr, TXDec 14, 1964 · N10195 · Substantial damageNTSB UNK65X1004Accident · No injuriesClosedHiller UH12A · Austin, TXDec 13, 1964 · N6444D · Substantial damage