Final NTSB investigations: Lycoming TVO-435-GIA
286 cases on aircraft whose registry engine model is Lycoming TVO-435-GIA. 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
| 1964 | 6 |
|---|---|
| 1965 | 3 |
| 1966 | 12 |
| 1967 | 15 |
| 1968 | 14 |
| 1969 | 16 |
| 1970 | 12 |
| 1971 | 6 |
| 1972 | 12 |
| 1973 | 9 |
| 1974 | 12 |
| 1975 | 10 |
| 1976 | 9 |
| 1977 | 10 |
| 1978 | 9 |
| 1979 | 9 |
| 1980 | 11 |
| 1981 | 5 |
| 1982 | 4 |
| 1983 | 5 |
| 1984 | 4 |
| 1985 | 3 |
| 1986 | 8 |
| 1987 | 4 |
| 1988 | 2 |
| 1989 | 4 |
| 1990 | 5 |
| 1991 | 7 |
| 1992 | 3 |
| 1993 | 3 |
| 1994 | 2 |
| 1995 | 1 |
| 1996 | 3 |
| 1997 | 7 |
| 1998 | 4 |
| 1999 | 4 |
| 2000 | 3 |
| 2001 | 1 |
| 2002 | 1 |
| 2003 | 3 |
| 2004 | 2 |
| 2005 | 3 |
| 2006 | 1 |
| 2007 | 1 |
| 2008 | 5 |
| 2012 | 1 |
| 2013 | 2 |
| 2014 | 1 |
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 3 |
| 2020 | 1 |
| 2024 | 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.\"completionStatus\" = 'Completed'
AND c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41526'))
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."completionStatus" = 'Completed'
AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41526'))
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 ERA26LA100Accident · No injuriesClass 4 · LimitedFinal reportBell 47G-3B · Floral City, FLThe student pilot’s loss of helicopter control during landing.NTSB ANC24LA065Accident · No injuriesClass 4 · LimitedFinal reportBeech 65-B80 · Woleai Atoll, MicronesiaThe pilot's selection of an unsuitable takeoff area, resulting in a loss of directional control. Contributing to the accident was a flooded runway.NTSB ERA20LA216Accident · No injuriesClass 3 · LimitedFinal reportBell 47G · Atoka, TNA total loss of engine power due to a blocked fuel line; the reason for the blockage could not be determined based on the available evidence.NTSB WPR19LA019Accident · Serious injuriesClass 3 · LimitedFinal reportBell 47G · Wichita Falls, TXA total loss of engine power for reasons that could not be determined based on the available information.NTSB CEN18LA306Accident · Minor injuriesClass 3 · LimitedFinal reportBell 47G 3B · Custer, SDThe pilot’s mismanagement of rotor RPM and subsequent forced landing on uneven terrain which led to a dynamic rollover.NTSB CEN18LA269Accident · Serious injuriesLimited investigationFinal reportBell 47J · Franklin, INA total loss of engine power for reasons that could not be determined based on the available evidence.NTSB GAA17CA436Accident · No injuriesData collectionFinal reportBell 47G 3B · Toterville, IAThe pilot’s failure to maintain rotor rpm while maneuvering at low altitude with low airspeed and a tailwind.NTSB WPR16LA069Accident · Minor injuriesLimited investigationFinal reportBell 47G 3B 1 · Carson City, NVThe pilot's failure to maintain sufficient main rotor rpm, which resulted in a loss of helicopter control and a dynamic rollover.NTSB GAA16CA055Accident · No injuriesData collectionFinal reportBell 47G · Searchlight, NVThe pilot's failure to maintain adequate clearance from a tree during hover flight.NTSB CEN14LA174Accident · No injuriesLimited investigationFinal reportBell 47G 3B · Oglesby, TXMaintenance personnel’s failure to safety wire the throttle control adapter per maintenance instructions when the carburetor was replaced and to detect that the adapter was not safety wired during the annual inspection, which resulted in the throttle control…NTSB CEN13LA395Accident · Minor injuriesLimited investigationFinal reportBell 47G-3B-1 · Plover, WIThe pilot’s failure to maintain proper engine rpm, which resulted in a high rate of descent and ground impact.NTSB CEN13FA357Accident · 1 fatalField investigationFinal reportBell 47G-3B-1 · Maplewood, MNThe loss of helicopter control for reasons that could not be determined because an examination of the helicopter and its systems revealed no malfunctions or failures that would have precluded normal operation.NTSB CEN12CA435Accident · No injuriesData collectionFinal reportBell 47G-3B-2 · Treynor, IAThe pilot’s improper fuel management, which resulted in a loss of engine power due to fuel exhaustion.NTSB CHI08CA254Accident · No injuriesData collectionFinal reportBell 47G-3B · Kenyon, MNThe pilot's inadequate preflight planning which resulted in the helicopter settling with power.NTSB CHI08CA210Accident · No injuriesData collectionFinal reportBell 47G-3B-2 · Lafetyette, INThe loss of engine power during an aerial application flight due to a fatigue fracture of the carburetor heat control valve spring and the inadequate maintenance inspection by the pilot/mechanic. An additional cause was the low altitude of the operation.NTSB LAX08CA229Accident · No injuriesData collectionFinal reportBell 47G-3B-1 · Shafter, CAThe pilot's failure to maintain adequate altitude while maneuvering. Contributing factors were the failure of the helicopter's lights during the night flight and the effect of that failure on the pilot's visual perception.NTSB CHI08CA192Accident · Minor injuriesData collectionFinal reportBell 47G-3B · Port Edwards, WIThe pilot failed to maintain control of the helicopter when he inadvertently flared the helicopter and the rotor rpm decayed as a result of sustaining bee stings during an aerial application flight. Contributing to the accidnet included the bees and the low…NTSB LAX08LA097Accident · No injuriesLimited investigationFinal reportBell 47G-3B-1 · Denio, NVThe pilot's inadvertent hard landing induced by a perceived loss of power and a main transmission anomaly while maneuvering at low altitude.NTSB DEN07LA155Accident · No injuriesLimited investigationFinal reportBell 47G-3B-1 · Avondale, COThe pilot's failure to attain translational lift and his improper flare. A contributing factor in this accident was the sudden wind shift.NTSB DFW06CA055Accident · No injuriesData collectionFinal reportBell 47-B3 · Dennison, TXThe in-flight separation of the stabilizer bar tube.NTSB DEN05LA137Accident · No injuriesLimited investigationFinal reportBell 47G-3B-1 · Rock Springs, WYthe pilot's failure to maintain control of the helicopter during the attempted autorotation after he experienced an engine overspeed that occurred for reasons undetermined.NTSB DFW05CA231Accident · No injuriesData collectionFinal reportBell 47 · Monette, ARThe loss of control as result of a loss of hydraulic pressure for undetermined reasons.NTSB SEA05CA122Accident · Minor injuriesData collectionFinal reportBell 47G-3B-1 · Brewster, WAThe pilot's inadvertent anti-torque pedal input, which resulted in a loss of control and collision with trees while hovering.NTSB SEA04LA114Accident · Serious injuriesLimited investigationFinal reportBell 47G-3B-1 · Medford, ORThe pilot's failure to maintain clearance from a tree while maneuvering. Trees were a factor.NTSB LAX04CA121Accident · No injuriesData collectionFinal reportBell 47-G3B2 · Salome, AZthe pilot's failure to maintain an adequate clearance from trees while approaching the landing zone.NTSB SEA03LA189Accident · Serious injuriesLimited investigationFinal reportBell 47G-3B-1 · Diamond, ORLoss of engine power for undetermined reasons during hover.NTSB IAD03LA042Accident · No injuriesLimited investigationFinal reportBell BHT-47-G3B2A · Lexington, KYThe pilot's failure to maintain directional control while maneuvering to land after a loss of engine power. A factor was the loss of engine power.NTSB SEA03LA023Accident · No injuriesLimited investigationFinal reportBell 47G · Idaho Falls, IDIn-flight loss of engine power for undetermined reasons.NTSB LAX03TA043Accident · No injuriesFinal reportBell 47G-3B-1 · Panaca, NVseparation of the no. 6 cylinder intake valve head from the valve stem, which resulted in a loss of engine power. The mechanism responsible for the valve failure is unknown.NTSB FTW01LA087Accident · No injuriesLimited investigationFinal reportBell 47G2 · Ardmore, OKthe loss of tail rotor control during maneuvering resultant from the failure of the tail rotor drive shaft coupling due to a stripped thread which allowed the grease lubricating the shaft to leak out. A factor was the lack of suitable terrain for the forced…NTSB ATL00LA086Accident · No injuriesLimited investigationFinal reportBell 47G-3B-2 · Pine Hill, ALThe pilot's failure to adequately preflight the helicopter, which resulted in his failure to remove the tie down.NTSB SEA00LA124Accident · Minor injuriesLimited investigationFinal reportBell 47G · Haines, ORThe pilot's failure to correctly judge his rate of descent and his failure to initiate his level off soon enough to keep the helicopter from impacting the terrain. Factors include hilly terrain near the edge of the field he was spraying.NTSB SEA00FA061Accident · 1 fatalField investigationFinal reportBell 47G-3B-1 · Stanwood, WAThe disengagement of the oil jet fitting from its threaded receptacle at the forward end of the engine crankshaft. This resulted in excessive oil within the clutch assembly, the subsequent slipping of the clutch, and ultimately the disengagement of the rotor…NTSB DEN99LA168Accident · No injuriesLimited investigationFinal reportBell 47G3B2A · Tremonton, UTThe pilot's failure to maintain rotor rpm while attempting a precautionary autorotation landing. A factor was the loss of engine power for undetermined reasons.NTSB MIA99LA217Accident · No injuriesLimited investigationFinal reportBell 47G-B3 · Selma, ALThe pilot's failure to maintain the proper touchdown point during landing causing the landing skid to become entangled with the edge of the helipad platform and the resultant rollover and main rotor blade strike of the tow vehicle.NTSB ATL99LA105Accident · Minor injuriesLimited investigationFinal reportBell 47 · Trenton, GAThe loss of main rotor rpm due to improper use of the flight controls by the pilot. Factors were the tailwind and trees.NTSB SEA99LA098Accident · No injuriesLimited investigationFinal reportBell 47G3B2A · Pendleton, ORA fouled external load cable, and the pilot's operation of the helicopter with a non-approved external bucket installation, resulting in misrouted hydraulic lines and consequent malfunction of the external load release system.NTSB FTW98LA400Accident · No injuriesLimited investigationFinal reportBell 47-G-2 · Ardmore, OKThe pilots failure to maintain clearance with terrain and the ensuing loss of control.NTSB CHI98LA198Accident · Serious injuriesLimited investigationFinal reportBell 47G · Le Center, MNthe pilot's failure to maintain clearance with the wire. A factor associated with the accident was the wire which the helicopter contacted.NTSB SEA98LA069Accident · No injuriesLimited investigationFinal reportBell 47G3B2A · Stanwood, WAThe failure of the number two connecting rod, which led to additional internal engine damage and a complete loss of power. Factors include soft terrain in the area where the pilot found it necessary to execute his forced landing.NTSB FTW98GA097Accident · 1 fatalFinal reportBell 47G-3B-2 · Spanish Fork, UTA total loss of power due to repeated engine overspeeds. A related factor was unsuitable terrain.NTSB SEA98LA006Accident · No injuriesLimited investigationFinal reportBell 47-G3B · Winston, MTFuel starvation due to fuel flow restriction from a failed carburetor automatic mixture control device. Factors include night light conditions for the forced landing.NTSB FTW97LA319Accident · No injuriesLimited investigationFinal reportBell 47G-3B-2 · Montrose, COfailure of the flight instructor (CFI) to properly supervise the flight and ensure that adequate rotor rpm was maintainted during the autorotation/landing. The high density altitude was a related factor.NTSB IAD97LA104Accident · Minor injuriesLimited investigationFinal reportBell 47G-3B-1 · Mt. Vernon, OHThe pilot's failure to maintain rotor RPM.NTSB SEA97LA168Accident · Minor injuriesLimited investigationFinal reportBell 47G-3B · Idaho Falls, IDThe pilot mismanaged his fuel supply which led to fuel exhaustion and subsequent loss of engine power. Factors contributing to the accident were the lack of adequate altitude and airspeed to successfully execute an autorotation.NTSB SEA97LA158Accident · Serious injuriesLimited investigationFinal reportBell 47G-3B-1 · Roosevelt, UTthe pilot's failure to maintain directional control. Wind gusts were a factor.NTSB LAX97TA213Accident · No injuriesFinal reportBell 47G-3B-1 · Fallon, NVexhaustion of the aircraft's fuel supply, due to improper planning and/or decision. A factor related to the accident was the high density altitude which made a successful autorotative landing unlikely.NTSB SEA97LA112Accident · Minor injuriesLimited investigationFinal reportBell 47G-3B · Snohomish, WAthe pilot's encounter with of a loss of tail rotor effectiveness (LTE) situation, and his subsequent inadequate remedial action. Related factors included: wind conditions that were conducive to an unanticipated right yaw event, and the pilot's limited…NTSB MIA96LA235Accident · No injuriesLimited investigationFinal reportBell 47G-3B-1 · Borinquen, PRthe pilot failed to maintain control of the aircraft while hover taxing. Factors in this accident were wind gusts and a tailwind.NTSB FTW96TA383Accident · No injuriesFinal reportBell 47G-3B-1 · Rangely, COthe pilot's excessive cyclic control input during a low altitude operation, and his failure to maintain altitude/clearance from high vegetation (sage brush). The proximity of high vegetation was a related factor.