# NTSB investigations: Lycoming VO-435 series A list on [Lycoming VO-435 series](https://openairdocs.org/engine/lycoming-vo-435-series.md). Matched to the registry by N-number and event date, newest first. Page 1 of 13 · 630 investigations - [NTSB CEN26LA234](https://openairdocs.org/ntsb/CEN26LA234.md): Bell 47G-2 · Troy, MO · Accident · Serious injuries · Class 3 · Limited · Preliminary report · Jun 22, 2026 · N65520 · Substantial damage > On 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 WPR26LA207](https://openairdocs.org/ntsb/WPR26LA207.md): Bell 47G-2 · Mettler, CA · Accident · No injuries · Class 4 · Limited · Final report · Jun 1, 2026 · N88755 · Substantial damage > The 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 ERA25LA167](https://openairdocs.org/ntsb/ERA25LA167.md): Hiller UH12E · Rockledge, FL · Accident · Serious injuries · Class 3 · Limited · Preliminary report · Apr 6, 2025 · N48263 · Substantial damage > On 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 ERA23LA157](https://openairdocs.org/ntsb/ERA23LA157.md): Bell 47G-2A-1 · Livonia, NY · Accident · No injuries · Class 4 · Limited · Final report · Mar 21, 2023 · N73905 · Substantial damage > The 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 WPR23LA006](https://openairdocs.org/ntsb/WPR23LA006.md): Bell 47G2 · Mesa, AZ · Accident · No injuries · Class 3 · Limited · Final report · Oct 1, 2022 · N24067 · Substantial damage > A total loss of engine power due to fuel exhaustion. - [NTSB WPR22LA096](https://openairdocs.org/ntsb/WPR22LA096.md): Bell 47 · Fallon, NV · Accident · No injuries · Class 4 · Limited · Final report · Feb 11, 2022 · N1023V · Substantial damage > The pilot's failure to maintain control of the helicopter during a hover which, resulted in a collision with a hangar. - [NTSB ERA21LA272](https://openairdocs.org/ntsb/ERA21LA272.md): Bell 47G-2A-1 · Brasstown, NC · Accident · Minor injuries · Class 4 · Limited · Final report · Jun 28, 2021 · N147AH · Substantial damage > The pilot’s inflight loss of control while conducting a hovering maneuver. - [NTSB GAA20CA062](https://openairdocs.org/ntsb/GAA20CA062.md): Bell 47G · Groveland, FL · Accident · No injuries · Data collection · Final report · Nov 7, 2019 · N6746D · Substantial damage > The 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 GAA20CA034](https://openairdocs.org/ntsb/GAA20CA034.md): Bell 47G · King City, CA · Accident · Minor injuries · Data collection · Final report · Oct 18, 2019 · N7060J · Substantial damage > The pilot's failure to maintain a proper descent rate, which resulted in a hard landing and the main rotor blades striking the tailboom. - [NTSB ERA19TA213](https://openairdocs.org/ntsb/ERA19TA213.md): Continental Copters Tomcat MK6C · Franklin, KY · Accident · Minor injuries · Class 3 · Final report · Jul 8, 2019 · N41830 · Substantial damage > The pilot’s failure to maintain main rotor rpm after takeoff, which resulted in a collision with terrain. - [NTSB GAA19CA250](https://openairdocs.org/ntsb/GAA19CA250.md): Bell 47G · Denton, TX · Accident · No injuries · Data collection · Final report · May 6, 2019 · N5990 · Substantial damage > The 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 GAA19CA216](https://openairdocs.org/ntsb/GAA19CA216.md): Bell 47G · Donna, TX · Accident · No injuries · Data collection · Final report · Apr 17, 2019 · N96671 · Substantial damage > The pilot's failure to maintain altitude during an agricultural application flight. - [NTSB CEN19LA067](https://openairdocs.org/ntsb/CEN19LA067.md): Bell 47G · Belen, NM · Accident · No injuries · Limited investigation · Final report · Jan 11, 2019 · N3755Z · Substantial damage > The pilot's failure to maintain adequate main rotor speed while the helicopter was in an out-of-ground effect hover. - [NTSB CEN18LA300](https://openairdocs.org/ntsb/CEN18LA300.md): Continental Copters Tomcat MK5A · Le Sueur, MN · Accident · Minor injuries · Limited investigation · Final report · Jul 27, 2018 · N9005T · Substantial damage > The 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 CEN18FA258](https://openairdocs.org/ntsb/CEN18FA258.md): Bell 47G · Arlington, IN · Accident · 1 fatal · Field investigation · Final report · Jul 6, 2018 · N96195 · Substantial damage > The 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 WPR18CA096](https://openairdocs.org/ntsb/WPR18CA096.md): Bell 47G · Pixley, CA · Accident · Serious injuries · Data collection · Final report · Feb 28, 2018 · N7800S · Substantial damage > A 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 WPR17LA206](https://openairdocs.org/ntsb/WPR17LA206.md): Bell 47G 5 · Salinas, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Sep 17, 2017 · N3285T · Substantial damage > The pilot’s inadequate visual lookout, which resulted in an in-flight collision with a wire. - [NTSB CEN16CA321](https://openairdocs.org/ntsb/CEN16CA321.md): Continental Copters Tomcat MK6B · Sparland, IL · Accident · Serious injuries · Data collection · Final report · Aug 7, 2016 · N17H · Substantial damage > The pilot's improper fuel management, which resulted in fuel exhaustion, a total loss of engine power, and a forced landing. - [NTSB CEN16LA284](https://openairdocs.org/ntsb/CEN16LA284.md): Texas Helicopter OH 13H/M74A · Minonk, IL · Accident · No injuries · Limited investigation · Final report · Jul 25, 2016 · N10009 · Substantial damage > Failure 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 CEN16LA213](https://openairdocs.org/ntsb/CEN16LA213.md): Bell 47G 5 · Laureles, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 9, 2016 · N6203N · Substantial damage > The 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 WPR16LA099](https://openairdocs.org/ntsb/WPR16LA099.md): Bell 47G 5 · San Ardo, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Apr 29, 2016 · N6288N · Substantial damage > The failure of the pin in the outboard end of the lateral flight control torque tube. - [NTSB ERA16LA167](https://openairdocs.org/ntsb/ERA16LA167.md): Bell 47D1 · Myerstown, PA · Accident · No injuries · Limited investigation · Final report · Apr 20, 2016 · N202CH · Substantial damage > A 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 ERA15LA296](https://openairdocs.org/ntsb/ERA15LA296.md): Bell 47G 3B 1 · Camden, AL · Accident · No injuries · Limited investigation · Final report · Aug 3, 2015 · N4002G · Substantial damage > A 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 WPR15LA193](https://openairdocs.org/ntsb/WPR15LA193.md): Bell 47G 5 · Salinas, CA · Accident · 1 fatal · Limited investigation · Final report · Jun 20, 2015 · N4427F · Substantial damage > The 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 GAA15CA122](https://openairdocs.org/ntsb/GAA15CA122.md): Continental Copters Tomcat MK5A · Elk Mound, WI · Accident · No injuries · Data collection · Final report · Jun 14, 2015 · N9045T · Substantial damage > The 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 WPR15LA116](https://openairdocs.org/ntsb/WPR15LA116.md): Bell 47G 2A · Ivanhoe, CA · Accident · Serious injuries · Limited investigation · Final report · Feb 27, 2015 · N4774S · Substantial damage > The pilot’s failure to maintain clearance from a power line while maneuvering at low altitude. - [NTSB CEN14LA415](https://openairdocs.org/ntsb/CEN14LA415.md): Bell 47G 2 · Jeanerette, LA · Accident · 1 fatal · Limited investigation · Final report · Aug 10, 2014 · N4690 · Destroyed > The pilot’s improper decision to operate an unairworthy helicopter, which resulted in a loss of control and subsequent impact with terrain. - [NTSB CEN14CA391](https://openairdocs.org/ntsb/CEN14CA391.md): Continental Copters Tomcat MK5A · Osage, MN · Accident · No injuries · Data collection · Final report · Jul 25, 2014 · N161SH · Substantial damage > The 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 WPR14CA296](https://openairdocs.org/ntsb/WPR14CA296.md): Bell 47G 2A · Merced, CA · Accident · Serious injuries · Data collection · Final report · Jul 18, 2014 · N47DT · Substantial damage > The pilot's failure to adequately monitor the environment to maintain clearance from the power pole guide wire during low level maneuvering. - [NTSB WPR14CA290](https://openairdocs.org/ntsb/WPR14CA290.md): Bell 47K · Kingston, WA · Accident · Minor injuries · Data collection · Final report · Jul 11, 2014 · N88771 · Substantial damage > The pilot's failure to maintain aircraft control during the landing approach, which resulted in an excessive descent angle and settling with power. - [NTSB CEN14LA418](https://openairdocs.org/ntsb/CEN14LA418.md): Texas Helicopter OH 13H/M74A · Little Falls, MN · Accident · 1 fatal · Limited investigation · Final report · May 28, 2014 · N51853 · Substantial damage > The pilot's failure to maintain clearance from a tree at the edge of a field that he was spraying. - [NTSB WPR14CA196](https://openairdocs.org/ntsb/WPR14CA196.md): Bell 47G · Bakersfield, CA · Accident · No injuries · Data collection · Final report · May 18, 2014 · N16414 · Substantial damage > The 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 ERA14FA066](https://openairdocs.org/ntsb/ERA14FA066.md): Texas Helicopter M74L · Sebring, FL · Accident · 1 fatal · Field investigation · Final report · Dec 6, 2013 · N1001N · Destroyed > A 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 WPR13LA429](https://openairdocs.org/ntsb/WPR13LA429.md): Texas Helicopter OH-13E/M74 · Santa Maria, CA · Accident · Minor injuries · Limited investigation · Final report · Sep 29, 2013 · N38113 · Substantial damage > The pilot's inadequate monitoring of the environment and failure to maintain clearance from transmission wires during a low-altitude maneuver. - [NTSB WPR13LA404](https://openairdocs.org/ntsb/WPR13LA404.md): Bell 47G5 · King City, CA · Accident · No injuries · Limited investigation · Final report · Sep 11, 2013 · N7836S · Substantial damage > The 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 CEN13LA537](https://openairdocs.org/ntsb/CEN13LA537.md): Continental Copters Tomcat MK5A · Arlington, MN · Accident · No injuries · Limited investigation · Final report · Sep 6, 2013 · N9005T · Substantial damage > The 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 CEN13LA442](https://openairdocs.org/ntsb/CEN13LA442.md): Texas Helicopter OH-13H/M74A · Streator, IL · Accident · No injuries · Limited investigation · Final report · Jul 29, 2013 · N10009 · Substantial damage > The pilot's diverted attention during an agricultural application maneuver, which resulted in the helicopter impacting a corn field. - [NTSB WPR13CA084](https://openairdocs.org/ntsb/WPR13CA084.md): Bell 47G · Five Points, CA · Accident · Minor injuries · Data collection · Final report · Jan 3, 2013 · N14841 · Substantial damage > The pilot’s failure to maintain clearance with a telephone pole during a low-level maneuver. - [NTSB CEN13LA086](https://openairdocs.org/ntsb/CEN13LA086.md): Bell 47G-2 · Walkerville, MI · Accident · 1 fatal · Limited investigation · Final report · Dec 1, 2012 · N3755Z · Substantial damage > The 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 CEN12LA557](https://openairdocs.org/ntsb/CEN12LA557.md): Bell 47G-2 · Flandreau, SD · Accident · No injuries · Limited investigation · Final report · Aug 14, 2012 · N444EH · Substantial damage > A malfunction of the helicopter’s throttle system, which resulted in a loss of engine power during cruise flight. - [NTSB CEN12CA484](https://openairdocs.org/ntsb/CEN12CA484.md): Bell 47G-2A · Austin, IN · Accident · Serious injuries · Data collection · Final report · Jul 27, 2012 · N652HA · Substantial damage > The pilot did not maintain clearance from terrain during a low-level aerial application flight and lost control of the helicopter. - [NTSB CEN11CA540](https://openairdocs.org/ntsb/CEN11CA540.md): Bell 47G-2 · Charles City, IA · Accident · Serious injuries · Data collection · Final report · Aug 2, 2011 · N4771N · Substantial damage > The pilot's failure to refuel the helicopter which resulted in a loss of engine power due to fuel exhaustion. - [NTSB CEN11CA524](https://openairdocs.org/ntsb/CEN11CA524.md): Texas Helicopter OH-13H/M74A · Creston, IL · Accident · Minor injuries · Data collection · Final report · Jul 28, 2011 · N10009 · Substantial damage > The pilot's failure to maintain adequate skid clearance from the helicopter cart during landing, resulting in a dynamic rollover. - [NTSB CEN11CA525](https://openairdocs.org/ntsb/CEN11CA525.md): Bell 47G-2A · Nicolett, MN · Accident · No injuries · Data collection · Final report · Jul 27, 2011 · N7578 · Substantial damage > The pilot's failure to maintain control of the helicopter while maneuvering during an aerial application flight. - [NTSB WPR11CA339](https://openairdocs.org/ntsb/WPR11CA339.md): Bell 47G-5 · Watsonville, CA · Accident · No injuries · Data collection · Final report · Jul 20, 2011 · N1375X · Substantial damage > The pilot's failure to maintain clearance from a pole while maneuvering during an aerial application flight. - [NTSB CEN11CA231](https://openairdocs.org/ntsb/CEN11CA231.md): Hiller UH-12D · Iowa, LA · Accident · No injuries · Data collection · Final report · Mar 17, 2011 · N11CU · Substantial damage > The pilot's inadequate compensation for gusty crosswinds during takeoff, which resulted in a loss of directional control. - [NTSB WPR10LA446](https://openairdocs.org/ntsb/WPR10LA446.md): Bell 47G · Salinas, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 3, 2010 · N4427F · Substantial damage > The pilot's visual flight rules flight into instrument meteorological conditions, which resulted in his spatial disorientation and loss of helicopter control. - [NTSB CEN10CA411](https://openairdocs.org/ntsb/CEN10CA411.md): Continental Copters Tomcat MK6B · Blackstone, IL · Accident · Minor injuries · Data collection · Final report · Jul 15, 2010 · N17H · Substantial damage > The helicopter encountered a dust devil at a low altitude during the aerial application flight. - [NTSB ERA09CA542](https://openairdocs.org/ntsb/ERA09CA542.md): Schweizer 269C · Quarryville, PA · Accident · Minor injuries · Data collection · Final report · Sep 26, 2009 · N233JA · Substantial damage > An untrained bystander's attempt to marshal the helicopter, which resulted in the helicopter's inadvertent encounter with an object. - [NTSB WPR09CA333](https://openairdocs.org/ntsb/WPR09CA333.md): Bell 47G-2 · Turlock, CA · Accident · No injuries · Data collection · Final report · Jul 8, 2009 · N6768D · Substantial damage > The pilot's failure to maintain rotor RPM while maneuvering at a low altitude. Next page: https://openairdocs.org/engine/lycoming-vo-435-series/ntsb.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql 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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey WHERE a.engine_model_code IN ('41525') ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/engine/lycoming-vo-435-series/ntsb --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.