NTSB investigations: Allison 250-C20 series
14 cases on aircraft whose registry engine model is Allison 250-C20 series, where the first occurrence was “Hard landing”. 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
| 1987 | 2 |
|---|---|
| 1988 | 1 |
| 1991 | 1 |
| 1992 | 1 |
| 1995 | 1 |
| 1997 | 1 |
| 1998 | 1 |
| 2001 | 1 |
| 2002 | 1 |
| 2003 | 2 |
| 2007 | 2 |
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_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 200))
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_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 200))
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 SEA07CA139Accident · No injuriesData collectionFinal reportHughes 369D · Torrance, CAThe pilot's loss of helicopter control while maneuvering at low altitude, which resulted in a hard landing. The wind gusts were a contributing factor.NTSB LAX07CA177Accident · Minor injuriesData collectionFinal reportMD Helicopters 500-E · Yerington, NVThe failure of the student and instructor to maintain an adequate main rotor rpm, and the instructor’s inadequate in-flight supervision while conducting a low-level simulated emergency procedure, which resulted in a hard landing.NTSB ATL03LA095Accident · No injuriesLimited investigationFinal reportAerospatiale AS355F2 · Bainbridge, GAThe pilot's improper flare during an attempted landing.NTSB FTW03LA147Accident · No injuriesLimited investigationFinal reportBell 206B · Hurst, TXThe improper flare by the pilot receiving instruction, which resulted in the hard landing. A contributing factor was the flight instructor's inadequate supervision.NTSB NYC02LA105Accident · No injuriesLimited investigationFinal reportBell 206 · Columbus, OHThe flight instructor's delay in applying remedial action. A factor in the accident was the pilot allowing the rotor rpm to become too low during the deceleration and touchdown phase of the autorotation.NTSB IAD01TA051Accident · Minor injuriesFinal reportHughes 369D · Taylorsville, KYthe flight instructor's inadequate aircraft control during a practice autorotation which resulted in a hard landing.NTSB FTW98LA235Accident · No injuriesLimited investigationFinal reportBell 206BIII · Hurst, TXThe pilot's delayed recovery from a simulated autorotative landing.NTSB NYC97LA041Accident · No injuriesLimited investigationFinal reportBell 206A · Linden, NJthe pilot allowing the rotor RPM to decay and his failure to take remedial action in time to recover the autorotation.NTSB NYC95LA198Accident · Minor injuriesLimited investigationFinal reportBell 206B · Bingham, MEthe pilot's inadequate landing flare resulting in a hard landing and roll over, and a subsequent collision with trees.NTSB SEA92LA088Accident · No injuriesLimited investigationFinal reportHughes 369E · Hillsboro, ORThe pilot in command's excessive application of collective.NTSB SEA91FA124Accident · No injuriesField investigationFinal reportBell 206BII · Brewster, WAThe pilot-in-command's selection of unsuitable terrain for the emergency simulation.NTSB ATL89FA051Accident · No injuriesField investigationFinal reportBell 206B · Pinson, ALTwo FAA inspectors were conducting currency training when the helicopter landed hard during a practice power recovery autorotation. The pilot had delayed in applying power and collective pitch. Upon contact with the ground, all engine instruments indicated…NTSB CHI87LA180Accident · No injuriesLimited investigationFinal reportHughes 369HS · Griffith, INThe tail boom of the helicopter was severed after rotor blade contact during a hard landing. The acc occurred during an autorotation demo for the police dept with a power recovery. Application of power was late and the helicopter landed hard and bounced. The…NTSB LAX87LA157Accident · No injuriesLimited investigationFinal reportMcDonnell Douglas 369E · Phoenix, AZDuring factory flt training, prior to delivery of the new helicopter to the owner, the CFI said he asked the student to perform a series of emergency procedures which included quick stops from an initial takeoff followed by hovering autorotations. The CFI…