NTSB investigations: Allison 250-C20 series
9 cases on aircraft whose registry engine model is Allison 250-C20 series, where the defining event was Loss of control in flight. 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
| 2011 | 1 |
|---|---|
| 2012 | 1 |
| 2013 | 1 |
| 2014 | 1 |
| 2018 | 3 |
| 2020 | 1 |
| 2026 | 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 ('03020')
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\" = '240'))
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 ('03020')
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" = '240'))
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 WPR26LA199Accident · Minor injuriesClass 4 · LimitedFinal reportBell 206-L4 · Cedar City, UTThe flight instructor's failure to maintain helicopter control while manipulating the engine governor reference rpm adjustment during hover operations, which resulted in a loss of control and impact with the ground.NTSB WPR20CA162Accident · No injuriesClass 4 · Data collectionFinal reportBell 206 · Elko, NVThe pilot's failure to maintain helicopter control in gusting wind that resulted in a loss in altitude and subsequent collision with a fence.NTSB GAA18CA512Accident · No injuriesClass 4 · Data collectionFinal reportBell 206 · Battle Mountain, NVThe pilot's failure to maintain the proper altitude and airspeed while flying in a canyon in gusting wind conditions.NTSB GAA18CA117Accident · No injuriesData collectionFinal reportHughes Helicopters 369 · Wrightwood, CAThe pilot’s high altitude, high gross weight landing with insufficient tail rotor thrust resulting in a loss of tail rotor effectiveness.NTSB WPR18FA074Accident · 1 fatalField investigationFinal reportHughes 369D · Pomeroy, WAA loss of control following the gunner's failure to ensure that the net maintained clearance from the tail rotor.NTSB CEN14CA525Accident · No injuriesData collectionFinal reportBell 206B · Nashoba, OKThe pilot's loss of directional control due a loss of tail rotor effectiveness.NTSB WPR13LA287Accident · Serious injuriesLimited investigationFinal reportBell 206B · Royal City, WAThe pilot's failure to maintain clearance from netting material during a low pass over trees, which resulted in a loss of helicopter control.NTSB CEN12FA321Accident · 1 fatalField investigationFinal reportBell 206-L4 · (Gulf of Mexico)The pilot’s failure to maintain clearance from an obstacle while landing on an obstructed helipad, which resulted in a collision and loss of control. Contributing to the accident was the failure of the helipad owner to mark the helipad closed and the failure…NTSB WPR11LA151Accident · No injuriesLimited investigationFinal reportBell 206B-III · Tooele, UTThe pilot did not maintain yaw control of the helicopter during a maneuvering hover. Contributing to the accident was the pilot’s lack of experience in the make and model helicopter.