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NTSB investigations: Allison 250-C20 series

19 cases on aircraft whose registry engine model is Allison 250-C20 series, where the first occurrence was “Loss of engine power(total) - mech failure/malf”. 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

19832026

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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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020')
      AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 351))
  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 SEA07LA108Accident · Minor injuriesLimited investigationFinal reportHughes 369D · Kahuku, HIFatigue cracking of the oil line from the engine gearbox to the oil pressure gauge, which resulted in loss of engine lubricating oil, leading to seizure of the power turbine.Apr 20, 2007 · N911FT · Substantial damageNTSB DFW05FA032Accident · Serious injuriesField investigationFinal reportHughes 369D · Zachary, LAThe loss of engine power as a result of fatigue cracking of the compressor adaptor coupling initiated by fretting on the pilot diameter and subsequent disconnection of the compressor from the turbine assembly. A contributing factor was the low operating…Dec 9, 2004 · N7148Z · Substantial damageNTSB CHI04LA027Accident · Minor injuriesLimited investigationFinal reportBell 206B · Coleman, WIThe loss of engine power for undetermined reasons and the unsuitable terrain encountered for the forced landing. The garage building was a factor.Nov 3, 2003 · N3198C · DestroyedNTSB SEA03FA169Accident · Serious injuriesField investigationFinal reportAerospatiale AS350D · Webb, IDAn over temperature condition within the gas generator turbine which led to first stage turbine blade fatigue as well as first stage blade track warping and consequent blade tip rub. The fatigue and blade tip rub ultimately led to blade separation and failure…Aug 13, 2003 · N57731 · Substantial damageNTSB ANC03LA073Accident · Minor injuriesLimited investigationFinal reportBell 206B · Aniak, AKThe compressor discharge pressure line (Pc line) B-nut coming loose at the fuel control unit, which resulted in a total loss of engine power, and subsequent in-flight collision with trees during an autorotation. A factor associated with the accident was the…Jul 10, 2003 · N111MT · Substantial damageNTSB LAX03LA183Accident · Minor injuriesLimited investigationFinal reportBell 206B · Malone, TXa fuel starvation induced loss of engine power due to fuel contamination.Jun 6, 2003 · N242TK · Substantial damageNTSB LAX02GA209Accident · Serious injuriesFinal reportMcDonnell Douglas 369E · Ontario, CAThe mechanic's improper maintenance procedures (FOD prevention) during a 100-hour inspection, which resulted in foreign object damage (FOD) to the compressor section and catastrophic engine failure. Factors were the presence of vehicles and power lines…Jun 25, 2002 · N40NT · DestroyedNTSB LAX01FA306Accident · Minor injuriesField investigationFinal reportBell 206B · Hilo, HIThe failure of the mechanic to secure the No. 8 bearing thrust nut during maintenance work, which resulted in the total failure of the first stage turbine wheel shaft. Also causal was his misjudgment of his height during the flare resulting in a hard landing.…Sep 30, 2001 · N206KS · DestroyedNTSB LAX00LA047Accident · No injuriesLimited investigationFinal reportBoeing 369E · Taft, CAThe fatigue failure of a second stage compressor vane due to erosion, which resulted in a catastrophic engine failure. An inadequate inspection of the compressor section by company maintenance personnel during the last 300-hour inspection was also causal in…Nov 30, 1999 · N5238C · Substantial damageNTSB LAX97LA120Accident · No injuriesLimited investigationFinal reportMcDonnell Douglas MD 369HS · Pacific Ocean (Pacific Ocean)A loss of engine power due to a deteriorated compressor air seal, which resulted from inadequate maintenance inspection of the helicopter to detect corrosion in the compressor case while being operated in a marine environment.Mar 11, 1997 · N95MS · DestroyedNTSB LAX96LA104Accident · No injuriesLimited investigationFinal reportBell 206BIII · Kamuela, HIfailure of the nose case (No.1) bearing resulting in oil starvation.Feb 1, 1996 · N90194 · Substantial damageNTSB MIA95LA078Accident · No injuriesLimited investigationFinal reportHughes 500C · Key Largo, FLThe pilot's misjudgment of altitude and failure to apply collective cushioning pitch during an autorotation resulting in a hard landing. Contributing to the accident was a total loss of engine power due to a loose coupling B-nut on the pneumatic fuel control…Feb 20, 1995 · N7172Z · Substantial damageNTSB FTW94LA110Accident · No injuriesLimited investigationFinal reportBell 206B · Belen, NMThe hard landing due to a delayed flare and improper touchdown. A factor was the loss of engine power.Mar 27, 1994 · N2779B · Substantial damageNTSB LAX89LA141Accident · No injuriesLimited investigationFinal reportHughes 369D · Vallejo, CAFatigue failure of a defective pc tube assembly resulting in a loss of engine power. A contributing factor was the unsuitable terrain.Mar 31, 1989 · N5108E · Substantial damageNTSB FTW89LA036Accident · Minor injuriesLimited investigationFinal reportBell 206B-III · S.Timbalier 151A collision between the aircraft and the platform during the emergency autorotation which caused the left skid and float to separate and destabilized the autorotation. The collision was probably unadoidable due to the maneuver that was being conducted at the…Jan 3, 1989 · N22704 · DestroyedNTSB LAX86LA155Accident · No injuriesLimited investigationFinal reportBell 206B · Huntington Bch, CAA Bell 206B collided with a berm after an eng failure while departing a helipad. The plt indicated he had just departed the helipad at night and at aprx 50 ft AGL the eng failed. The acft vertical fin hit the berm causing the tail boom to bend aft of the…Mar 23, 1986 · N49643 · Substantial damageNTSB LAX86LA091Accident · Minor injuriesLimited investigationFinal reportBell 206B-3 · Waimea, HIWhile on a local flt, the plt descended to aprx 500 ft AGL and flew the helicopter along a coastal area. He reported the helicopter suddenly lost power and he initiated an autorotative landing to the beach where the helicopter 'had a hard landing.' An exam…Jan 16, 1986 · N3179X · Substantial damageNTSB FTW84LA270Accident · Minor injuriesLimited investigationFinal reportBell 206B · South PeltoWhile cruising at 550 ft above the gulf of Mexico, the plt noted hi tot indications, followed by loss of N1 RPM & eng failure. An autorotation was initiated which terminated in a hard landing in 5 ft waves. One emergency float separated during the landing &…Jun 8, 1984 · N2276Q · Substantial damageNTSB ANC83FA144Accident · No injuriesField investigationFinal reportBell 206L-1 · Bettles, AKAccording to the plt, the low fuel warning light illuminated when the fuel gage was indicating 200 lbs. He reported he could see the arpt lights & elected to continue the flt. After arriving, he terminated his apch to a 30 to 50 ft hover with no forward…Aug 13, 1983 · N1081K · Substantial damage