NTSB investigations: Allison 250 SER 250HP
8 cases on aircraft whose registry engine model is Allison 250 SER 250HP, where the defining event was Loss of engine power (total). 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
| 2010 | 1 |
|---|---|
| 2012 | 2 |
| 2013 | 1 |
| 2015 | 1 |
| 2016 | 1 |
| 2020 | 1 |
| 2025 | 1 |
Where
Open the mapLatest 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.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03002', '03003')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e.\"isDefiningEvent\" AND e.\"tier2Number\" = '341'))
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 ('03002', '03003')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '341'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun 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 WPR25LA134Accident · No injuriesClass 3 · LimitedPreliminary reportBell 206B · Amboy, WAOn April 14, 2025, about 1800 Pacific daylight time, a Bell 206B, N16671, was substantially damaged when it was involved in an accident near Amboy, Washington. The pilot was not injured. The helicopter was operated as a Title 14 Code of Federal Regulations,…NTSB ERA21LA023Accident · No injuriesClass 3 · LimitedFinal reportBell 206 · Zephyrhills, FLImproper torquing of the “B” nut at the fuel control unit, which led to a total loss of engine power and subsequent autorotation that resulted in substantial damage.NTSB CEN16FA171Accident · 1 fatalField investigationFinal reportMcdonnell Douglas Helicopter 369E · Reedsville, WIThe failure of the power turbine governor's dual-spool bearing due to a lack of lubrication, which resulted in a complete loss of engine power and subsequent impact with terrain.NTSB CEN15LA370Accident · No injuriesLimited investigationFinal reportBell 206B · Cresco, IAThe loss of engine power due to the high-cycle fatigue failure of the third-stage turbine wheel.NTSB CEN13CA145Accident · No injuriesData collectionFinal reportHughes 369HS · London, OHThe pilot's failure to comply with established cold weather operating procedures, which resulted in a total loss of engine power. Contributing to the accident was the pilot's excessive aft cyclic input during the landing flare, which resulted in main rotor…NTSB WPR12LA408Accident · No injuriesLimited investigationFinal reportBell Helicopter Textron 206L-1 · Grand Canyon, AZA total loss of engine power during descent for reasons that could not be determined because postaccident engine examinations and testing revealed no evidence of an anomaly that would have precluded normal operation.NTSB WPR12CA236Accident · No injuriesData collectionFinal reportBell 206B · Burbank, WAThe failure of maintenance personnel to properly torque an air tube fitting, which resulted in a total loss of engine power.NTSB CEN10LA431Accident · 1 fatalLimited investigationFinal reportBell 47G-4A · Rochester, MNThe total loss of engine power due to a high-cycle fatigue fracture of a first-stage compressor blade. The reason for the fracture could not be determined during postaccident examination.