NTSB investigations: Lycoming T-53 series
16 cases on aircraft whose registry engine model is Lycoming T-53 series, where the first occurrence was “Airframe/component/system failure/malfunction”. 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
| 1984 | 1 |
|---|---|
| 1986 | 1 |
| 1989 | 2 |
| 1990 | 1 |
| 1993 | 2 |
| 1994 | 1 |
| 1996 | 1 |
| 1997 | 3 |
| 1998 | 1 |
| 1999 | 1 |
| 2000 | 1 |
| 2001 | 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 ('41552', '41549', '41587')
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\" = 130))
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 ('41552', '41549', '41587')
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" = 130))
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 SEA01LA046Accident · 1 fatalLimited investigationFinal reportWestern International UH-1H · Darby, MTInflight loss of a tail rotor pitch change link-to-blade grip attach bolt, resulting partial loss of tail rotor control, and subsequent entanglement of the helicopter's external load cable with a tree during emergency descent. Factors included the pilot's…NTSB MIA00LA170Accident · No injuriesLimited investigationFinal reportSouthwest Florida SW204 · Fort Pierce, FLAn in-flight separation of a tail rotor blade tip weight resulting in tail rotor assembly imbalance and separation due to the installation of an unapproved rotor blade by company maintenance personnel, and the subsequent collision with trees during an…NTSB LAX99LA283Accident · No injuriesLimited investigationFinal reportBell UH-1B · Lost Hills, CAFailure and separation of the 90-degree gearbox as a result of the disengagement of the pinion and gear teeth. The cause(s) of the pinion and gear disengagement were undetermined.NTSB SEA99LA020Accident · Serious injuriesLimited investigationFinal reportGarlick UH-1H · Darrington, WAThe total separation of the vertical fin (stabilizer), as the result of fatigue cracks which initiated in the fourth rivet hole above where the fin extends from the tailboom.NTSB SEA98LA017Accident · Minor injuriesLimited investigationFinal reportBell TH-1L · Canby, ORThe pilot's allowance of excessive airspeed resulting in the long-line hook impacting the tail rotor, and his allowance of an airspeed bleed-off preventing a successful run-on landing due to a loss of yaw control.NTSB SEA97FA196Accident · 1 fatalField investigationFinal reportSouthern Aero UH-1B · Skykomish, WAA fatigue fracture in the main rotor mast, which resulted in an in flight separation of the main rotor from the helicopter. Contributing to the accident was insufficient Federal Aviation Administration airworthiness standards and requirements for the aircraft.NTSB MIA97TA139Accident · No injuriesFinal reportBell 204-B · Calderwood, TNThe inadequate maintenance inspection of the helicopter resulting in loss of lubrication from the main drive shaft going undetected until failure of the drive shaft.NTSB SEA96FA187Accident · Serious injuriesField investigationFinal reportGarlick UH-1H · Coeur D'Alene, IDFatigue fracture of the left forward vertical stabilizer spar, resulting in loss of the vertical stabilizer and tail rotor and subsequent loss of control. A factor was insufficient applicability (by make and model) of an existing FAA airworthiness directive…NTSB BFO94LA159Accident · No injuriesLimited investigationFinal reportBell UH-1B · Carrabasset, MEFracture failure of the tail rotor drive intermediate gearbox.NTSB SEA93LA207Accident · No injuriesLimited investigationFinal reportBell UH-1B · Pierce, IDSeparation of the 90 degree gearbox after fatigue failure of the gearbox attach bolts. Factors include hilly/mountainous terrain.NTSB ANC93FA056Accident · 1 fatalField investigationFinal reportBell 204B · Copper Harbor, AKFatigue failure of the tail rotor gearbox, and improper helicopter operations being conducted by the operator resulting in repetitive at and over maximum loads. Factors in the accident were: material defect of the tail rotor gear box (inadequate quality…NTSB ATL90FA100Accident · 1 fatalField investigationFinal reportBell 205A-1 · Moncks Corner, SCThe in-flight separation of the main rotor because of the failure of a pillow block bolt, and the failure of the operator/repair station to follow the overhaul procedures.NTSB LAX90DUJ05Accident · No injuriesFinal reportBell UH-1E · Mesa, AZThe inflight separation of the tail rotor due to improper maintenance procedures and the installation of incorrect attachment hardware on the tail rotor blade pitch change linkages.NTSB ATL89FA130Accident · Serious injuriesField investigationFinal reportBell UH-1E · Aiken, SCImproper installation of a tail rotor pitch change crosshead retention bolt by the company mechanic, which resulted in loosening of the bolt and eventual failure of the tail rotor assembly/blade and subsequent loss of control. Trees at the crash site…NTSB LAX86DVA06Accident · Minor injuriesFinal reportBell UH-1B · Chowchilla, CAWhile returning from a spraying operation the plt observed that the main transmission oil pressure gage indicated zero. The plt reported that the engine master caution did not illuminate and that the oil temperature gage was normal. The plt stated that he…NTSB MIA84FA166Accident · 1 fatalField investigationFinal reportBell UH-1B · Clermont, FLThe plt was not aware that two ground attendants were riding the cable during a logging operation when there was an accidental cable release & the attendants fell to the ground. Examination of the acfts hook did not reveal a system failure or malfunction.…