NTSB investigations: Lycoming VO-435 series
629 cases on aircraft whose registry engine model is Lycoming VO-435 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
| 1964 | 17 |
|---|---|
| 1965 | 18 |
| 1966 | 15 |
| 1967 | 21 |
| 1968 | 12 |
| 1969 | 16 |
| 1970 | 28 |
| 1971 | 15 |
| 1972 | 20 |
| 1973 | 25 |
| 1974 | 28 |
| 1975 | 24 |
| 1976 | 18 |
| 1977 | 14 |
| 1978 | 27 |
| 1979 | 20 |
| 1980 | 18 |
| 1981 | 16 |
| 1982 | 15 |
| 1983 | 14 |
| 1984 | 14 |
| 1985 | 16 |
| 1986 | 13 |
| 1987 | 10 |
| 1988 | 12 |
| 1989 | 11 |
| 1990 | 6 |
| 1991 | 13 |
| 1992 | 10 |
| 1993 | 8 |
| 1994 | 11 |
| 1995 | 9 |
| 1996 | 7 |
| 1997 | 4 |
| 1998 | 5 |
| 1999 | 5 |
| 2000 | 6 |
| 2001 | 5 |
| 2002 | 8 |
| 2003 | 8 |
| 2004 | 4 |
| 2005 | 4 |
| 2006 | 4 |
| 2007 | 4 |
| 2009 | 3 |
| 2010 | 2 |
| 2011 | 5 |
| 2012 | 3 |
| 2013 | 6 |
| 2014 | 6 |
| 2015 | 4 |
| 2016 | 5 |
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 6 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 1 |
| 2025 | 1 |
| 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 c.\"mKey\" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525'))
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 ('41525'))
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 CEN26LA234Accident · Serious injuriesClass 3 · LimitedPreliminary reportBell 47G-2 · Troy, MOOn June 22, 2026, about 1840 central daylight time, a Bell 47G-2 helicopter, N65520, was substantially damaged when it was involved in an accident near Troy, Missouri. The pilot sustained serious injuries. The helicopter was operated as a Title 14 Code of…NTSB WPR26LA207Accident · No injuriesClass 4 · LimitedFinal reportBell 47G-2 · Mettler, CAThe pilot's failure to ensure the loading hose had been disconnected before takeoff, which resulted in an interrupted takeoff and subsequent loss of control. Contributing to the accident was the ground loader's failure to disconnect the hose before…NTSB ERA25LA167Accident · Serious injuriesClass 3 · LimitedPreliminary reportHiller UH12E · Rockledge, FLOn April 6, 2025, about 1020 eastern daylight time, a Hiller UH-12E, N48263, was substantially damaged when it was involved in an accident near Rockledge, Florida. The private pilot and passenger sustained serious injuries. The helicopter was operated as a…NTSB ERA23LA157Accident · No injuriesClass 4 · LimitedFinal reportBell 47G-2A-1 · Livonia, NYThe pilot’s delayed action to arrest the high descent rate during a practice autorotation in tailwind conditions which ultimately resulted in loss of control.NTSB WPR23LA006Accident · No injuriesClass 3 · LimitedFinal reportBell 47G2 · Mesa, AZA total loss of engine power due to fuel exhaustion.NTSB WPR22LA096Accident · No injuriesClass 4 · LimitedFinal reportBell 47 · Fallon, NVThe pilot's failure to maintain control of the helicopter during a hover which, resulted in a collision with a hangar.NTSB ERA21LA272Accident · Minor injuriesClass 4 · LimitedFinal reportBell 47G-2A-1 · Brasstown, NCThe pilot’s inflight loss of control while conducting a hovering maneuver.NTSB GAA20CA062Accident · No injuriesData collectionFinal reportBell 47G · Groveland, FLThe student pilot's improper cyclic input after a reported hydraulic failure, the reason for which could not be determined, and his failure to follow the emergency procedures, which resulted in a hard landing.NTSB GAA20CA034Accident · Minor injuriesData collectionFinal reportBell 47G · King City, CAThe pilot's failure to maintain a proper descent rate, which resulted in a hard landing and the main rotor blades striking the tailboom.NTSB ERA19TA213Accident · Minor injuriesClass 3Final reportContinental Copters Tomcat MK6C · Franklin, KYThe pilot’s failure to maintain main rotor rpm after takeoff, which resulted in a collision with terrain.NTSB GAA19CA250Accident · No injuriesData collectionFinal reportBell 47G · Denton, TXThe flight instructor's improper decision to instruct the student pilot to establish a hover and reposition the helicopter with a tailwind, which resulted in the student pilot's loss of pitch control.NTSB GAA19CA216Accident · No injuriesData collectionFinal reportBell 47G · Donna, TXThe pilot's failure to maintain altitude during an agricultural application flight.NTSB CEN19LA067Accident · No injuriesLimited investigationFinal reportBell 47G · Belen, NMThe pilot's failure to maintain adequate main rotor speed while the helicopter was in an out-of-ground effect hover.NTSB CEN18LA300Accident · Minor injuriesLimited investigationFinal reportContinental Copters Tomcat MK5A · Le Sueur, MNThe pilot's inadequate preflight and in-flight fuel planning, during which he did not visually check the fuel quantity in the fuel tanks and instead relied on the fuel gauges that were showing erroneous fuel quantity indications, which resulted in fuel…NTSB CEN18FA258Accident · 1 fatalField investigationFinal reportBell 47G · Arlington, INThe inflight separation of the upper transmission due to the thread failure of transmission housing attachment bolts, which were installed on the helicopter with thread damage from a prior installation.NTSB WPR18CA096Accident · Serious injuriesData collectionFinal reportBell 47G · Pixley, CAA total loss of engine power due to fuel starvation, which resulted from the pilot’s failure to ensure that adequate fuel was on board for the flight. Contributing to the accident was the pilot’s self-induced pressure to complete the flight due to impending…NTSB WPR17LA206Accident · Minor injuriesClass 3 · LimitedFinal reportBell 47G 5 · Salinas, CAThe pilot’s inadequate visual lookout, which resulted in an in-flight collision with a wire.NTSB CEN16CA321Accident · Serious injuriesData collectionFinal reportContinental Copters Tomcat MK6B · Sparland, ILThe pilot's improper fuel management, which resulted in fuel exhaustion, a total loss of engine power, and a forced landing.NTSB CEN16LA284Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH 13H/M74A · Minonk, ILFailure of the truck driver to ensure that he had adequate clearance to pass under the helicopter and the failure of the loader to park in a safer area for reloading operations.NTSB CEN16LA213Accident · Minor injuriesLimited investigationFinal reportBell 47G 5 · Laureles, TXThe pilot's failure to apply additional engine power when he applied collective input, which led to a loss of rotor speed and the exceedance of the helicopter’s performance capability.NTSB WPR16LA099Accident · Minor injuriesClass 3 · LimitedFinal reportBell 47G 5 · San Ardo, CAThe failure of the pin in the outboard end of the lateral flight control torque tube.NTSB ERA16LA167Accident · No injuriesLimited investigationFinal reportBell 47D1 · Myerstown, PAA total loss of engine power for reasons that could not be determined because examination of the engine revealed no mechanical anomalies that would have precluded normal operation.NTSB ERA15LA296Accident · No injuriesLimited investigationFinal reportBell 47G 3B 1 · Camden, ALA failure of the helicopter's hydraulic flight control systems for reasons that could not be determined due to the fire damage, and the pilot's inability to turn off the hydraulic system to relieve control pressure.NTSB WPR15LA193Accident · 1 fatalLimited investigationFinal reportBell 47G 5 · Salinas, CAThe non-instrument-rated pilot's visual flight rules flight into instrument meteorological conditions, which resulted in his spatial disorientation and loss of helicopter control. Contributing to the accident was the pilot's impairment by high-dose opioid use.NTSB GAA15CA122Accident · No injuriesData collectionFinal reportContinental Copters Tomcat MK5A · Elk Mound, WIThe pilot's failure to maintain a positive rate of climb after taking off from the service truck, which resulted in the helicopter impacting terrain.NTSB WPR15LA116Accident · Serious injuriesLimited investigationFinal reportBell 47G 2A · Ivanhoe, CAThe pilot’s failure to maintain clearance from a power line while maneuvering at low altitude.NTSB CEN14LA415Accident · 1 fatalLimited investigationFinal reportBell 47G 2 · Jeanerette, LAThe pilot’s improper decision to operate an unairworthy helicopter, which resulted in a loss of control and subsequent impact with terrain.NTSB CEN14CA391Accident · No injuriesData collectionFinal reportContinental Copters Tomcat MK5A · Osage, MNThe total loss of engine power due to water contamination of the fuel, which resulted in the pilot's forced landing and impact with terrain. Contributing to the accident was the pilot's decision to operate the helicopter without resolving the fuel…NTSB WPR14CA296Accident · Serious injuriesData collectionFinal reportBell 47G 2A · Merced, CAThe pilot's failure to adequately monitor the environment to maintain clearance from the power pole guide wire during low level maneuvering.NTSB WPR14CA290Accident · Minor injuriesData collectionFinal reportBell 47K · Kingston, WAThe pilot's failure to maintain aircraft control during the landing approach, which resulted in an excessive descent angle and settling with power.NTSB CEN14LA418Accident · 1 fatalLimited investigationFinal reportTexas Helicopter OH 13H/M74A · Little Falls, MNThe pilot's failure to maintain clearance from a tree at the edge of a field that he was spraying.NTSB WPR14CA196Accident · No injuriesData collectionFinal reportBell 47G · Bakersfield, CAThe pilot's failure to maintain aircraft control after the helicopter's skid catching on the side of a trailer during takeoff, which resulted in a dynamic rollover.NTSB ERA14FA066Accident · 1 fatalField investigationFinal reportTexas Helicopter M74L · Sebring, FLA partial loss of engine power as a result of contamination of the engine’s fuel supply, and the pilot’s impaired performance due to his use of diphenhydramine, which resulted in his inability to complete a forced or precautionary autorotative landing…NTSB WPR13LA429Accident · Minor injuriesLimited investigationFinal reportTexas Helicopter OH-13E/M74 · Santa Maria, CAThe pilot's inadequate monitoring of the environment and failure to maintain clearance from transmission wires during a low-altitude maneuver.NTSB WPR13LA404Accident · No injuriesLimited investigationFinal reportBell 47G5 · King City, CAThe failure of the helicopter’s center frame tube due to a fatigue crack and corrosion originating from a welded surface. Contributing to the accident was maintenance personnel’s inadequate inspection of the helicopter during its most recent 100-hour…NTSB CEN13LA537Accident · No injuriesLimited investigationFinal reportContinental Copters Tomcat MK5A · Arlington, MNThe pilot’s failure to maintain control of the helicopter while maneuvering when he removed his hand from the collective control while plugging in his radio connection to his helmet, which resulted in the collective moving to the full-down position.NTSB CEN13LA442Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH-13H/M74A · Streator, ILThe pilot's diverted attention during an agricultural application maneuver, which resulted in the helicopter impacting a corn field.NTSB WPR13CA084Accident · Minor injuriesData collectionFinal reportBell 47G · Five Points, CAThe pilot’s failure to maintain clearance with a telephone pole during a low-level maneuver.NTSB CEN13LA086Accident · 1 fatalLimited investigationFinal reportBell 47G-2 · Walkerville, MIThe pilot's failure to maintain altitude while maneuvering, which resulted in a collision with trees. Contributing to the accident was the pilot's decision to fly at a low altitude, which did not provide enough margin to recover from the descent.NTSB CEN12LA557Accident · No injuriesLimited investigationFinal reportBell 47G-2 · Flandreau, SDA malfunction of the helicopter’s throttle system, which resulted in a loss of engine power during cruise flight.NTSB CEN12CA484Accident · Serious injuriesData collectionFinal reportBell 47G-2A · Austin, INThe pilot did not maintain clearance from terrain during a low-level aerial application flight and lost control of the helicopter.NTSB CEN11CA540Accident · Serious injuriesData collectionFinal reportBell 47G-2 · Charles City, IAThe pilot's failure to refuel the helicopter which resulted in a loss of engine power due to fuel exhaustion.NTSB CEN11CA524Accident · Minor injuriesData collectionFinal reportTexas Helicopter OH-13H/M74A · Creston, ILThe pilot's failure to maintain adequate skid clearance from the helicopter cart during landing, resulting in a dynamic rollover.NTSB CEN11CA525Accident · No injuriesData collectionFinal reportBell 47G-2A · Nicolett, MNThe pilot's failure to maintain control of the helicopter while maneuvering during an aerial application flight.NTSB WPR11CA339Accident · No injuriesData collectionFinal reportBell 47G-5 · Watsonville, CAThe pilot's failure to maintain clearance from a pole while maneuvering during an aerial application flight.NTSB CEN11CA231Accident · No injuriesData collectionFinal reportHiller UH-12D · Iowa, LAThe pilot's inadequate compensation for gusty crosswinds during takeoff, which resulted in a loss of directional control.NTSB WPR10LA446Accident · Serious injuriesLimited investigationFinal reportBell 47G · Salinas, CAThe pilot's visual flight rules flight into instrument meteorological conditions, which resulted in his spatial disorientation and loss of helicopter control.NTSB CEN10CA411Accident · Minor injuriesData collectionFinal reportContinental Copters Tomcat MK6B · Blackstone, ILThe helicopter encountered a dust devil at a low altitude during the aerial application flight.NTSB ERA09CA542Accident · Minor injuriesData collectionFinal reportSchweizer 269C · Quarryville, PAAn untrained bystander's attempt to marshal the helicopter, which resulted in the helicopter's inadvertent encounter with an object.NTSB WPR09CA333Accident · No injuriesData collectionFinal reportBell 47G-2 · Turlock, CAThe pilot's failure to maintain rotor RPM while maneuvering at a low altitude.