NTSB investigations: Allison 250-C20 series, 1999
16 cases on aircraft whose registry engine model is Allison 250-C20 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
| 1973 | 2 |
|---|---|
| 1974 | 1 |
| 1975 | 2 |
| 1978 | 1 |
| 1979 | 3 |
| 1980 | 3 |
| 1981 | 5 |
| 1982 | 2 |
| 1983 | 2 |
| 1984 | 7 |
| 1985 | 6 |
| 1986 | 6 |
| 1987 | 6 |
| 1988 | 5 |
| 1989 | 7 |
| 1990 | 6 |
| 1991 | 5 |
| 1992 | 9 |
| 1993 | 7 |
| 1994 | 13 |
| 1995 | 10 |
| 1996 | 10 |
| 1997 | 10 |
| 1998 | 4 |
| 1999 | 16 |
| 2000 | 13 |
| 2001 | 13 |
| 2002 | 14 |
| 2003 | 19 |
| 2004 | 15 |
| 2005 | 14 |
| 2006 | 12 |
| 2007 | 19 |
| 2008 | 5 |
| 2009 | 10 |
| 2010 | 4 |
| 2011 | 4 |
| 2012 | 6 |
| 2013 | 9 |
| 2014 | 11 |
| 2015 | 5 |
| 2016 | 2 |
| 2017 | 9 |
| 2018 | 10 |
| 2019 | 2 |
| 2020 | 5 |
| 2021 | 6 |
| 2022 | 7 |
| 2023 | 3 |
| 2024 | 5 |
| 2026 | 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 year(c.\"eventDate\") = 1999
AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020'))
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 year(c."eventDate") = 1999
AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03020'))
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 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…NTSB SEA00FA021Accident · Minor injuriesField investigationFinal reportBell 206L-3 · Seattle, WAAdequate separation and lookout not maintained by the pilots of both aircraft.NTSB CHI00FA020Accident · 2 fatalField investigationFinal reportBell 206B · Cottage Grove, MNUndetermined.NTSB LAX00GA025Accident · 2 fatalFinal reportMcDonnell Douglas 500N · San Jose, CAThe pilot's in-flight loss of control due to the failure and separation of the forward thruster control cable telescoping sleeve ball swivel fitting, which resulted in a stuck thruster and the entry into an uncontrollable yaw/spin. Also causal was the…NTSB LAX00LA016Accident · Minor injuriesLimited investigationFinal reportBell 206-B3 · Soda Springs, CAThe failure of the pilot-in-command to maintain landing skid clearance during hover taxi, which resulted in a dynamic rollover.NTSB LAX99LA292Accident · 2 fatalLimited investigationFinal reportHughes 369HS · Pohnpei (Pacific Ocean)An in-flight collision with the water for undetermined reasons.NTSB LAX99LA237Accident · No injuriesLimited investigationFinal reportHiller UH-12ET · Williams, CAThe pilot's inadequate preflight planning and verification that fuel was available for the intended flight. A factor was the fuel quantity false indication.NTSB NYC99LA147Accident · Minor injuriesLimited investigationFinal reportBell 206B-III · Tinicum, PAThe pilot's failure to maintain a proper altitude above the water.NTSB LAX99LA253Accident · Minor injuriesLimited investigationFinal reportHughes 369HS · Pacific Ocean (Pacific Ocean)The removal of the tail rotor blade abrasion strips by the use of an unapproved method by the maintenance personnel which resulted in the imbalance of the tail rotor blade assembly and subsequent separation of the 90-degree gear box; the pilot/mechanic's…NTSB MIA99FA158Accident · 1 fatalField investigationFinal reportHughes 369E · Intercession, FLThe pilot's improper fuel management that resulted in fuel exhaustion and a total loss of engine power.NTSB LAX99FA136Accident · 1 fatalField investigationFinal reportBell 206B · Grand Canyon, AZThe failure of the flight crew to properly preflight the helicopter and to detect and remove accumulated snow from the engine inlets and plenum chamber. Factors in the accident were the clouded plenum chamber inspection window and the failure of preceding…NTSB MIA99LA111Accident · No injuriesLimited investigationFinal reportFairchild Hiller FH-1100 · Zephyrhills, FLThe student pilot's improper use of flight controls (cyclic and collective) during a takeoff to a hover. This resulted in the helicopter encountering dynamic rollover and rolling over on its right side.NTSB LAX99LA116Accident · Minor injuriesLimited investigationFinal reportBell 206B · Delhi, CAThe pilot's failure to maintain clearance while landing in proximity to high vegetation, which resulted in the inadvertent contact of the spray boom to the trees.NTSB SEA99FA037Accident · No injuriesField investigationFinal reportHiller UH-12E · Yellow Pine, IDAltitude deviation during aerial taxi for undetermined reasons.NTSB FTW99LA076Accident · Minor injuriesLimited investigationFinal reportBell 206-B3 · Sabine Pass, TXThe pilot's inadvertent flight into instrument meteorological conditions and subsequent spatial disorientation. Factors were the dark night conditions, the fog, and the pilot's failure to obtain a weather briefing prior to the flight.NTSB DEN99TA031Accident · No injuriesFinal reportHughes 369D · Woodruff, UTA partial loss of engine power due to erosion in the compressor assembly module. Factors were a missing rotating labyrinth seal, the installation of which had not been performed by unknown maintenance personnel.