# NTSB investigations: Lycoming O-540-F1B5: Loss of control in flight NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB CEN24LA343](https://openairdocs.org/ntsb/CEN24LA343.md): Robinson Helicopter R44 · Grand Forks, ND · Accident · No injuries · Class 4 · Limited · Final report · Sep 6, 2024 · N896J · Substantial damage > The student pilot’s failure to maintain helicopter control which resulted in impact with the ground. Contributing to the outcome was the flight instructor’s delayed remedial action. - [NTSB CEN24LA135](https://openairdocs.org/ntsb/CEN24LA135.md): Robinson Helicopter R44 · Knox City, TX · Accident · No injuries · Class 4 · Limited · Final report · Mar 13, 2024 · N3040P · Substantial damage > The pilot’s failure to maintain directional control during takeoff, which resulted in a rollover and an impact with terrain. - [NTSB ERA23LA350](https://openairdocs.org/ntsb/ERA23LA350.md): Robinson Helicopter R44 · Immokalee, FL · Accident · Serious injuries · Class 4 · Limited · Final report · Aug 26, 2023 · N4147Q · Substantial damage > The flight instructor’s inadequate supervision of the student pilot during hover flight, which resulted in main rotor blade contact with the ground after the student pilot applied a sudden control input. - [NTSB CEN23LA219](https://openairdocs.org/ntsb/CEN23LA219.md): Robinson Helicopter R44 · Pontiac, MI · Accident · No injuries · Class 4 · Limited · Final report · May 31, 2023 · N7102Z · Substantial damage > The flight crew’s inadequate compensation for gusting wind, and the flight instructor’s delayed remedial action, which resulted in impact with the ground. - [NTSB CEN23LA130](https://openairdocs.org/ntsb/CEN23LA130.md): Robinson Helicopter R44 · De Kalb, TX · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 11, 2023 · N4164T · Substantial damage > The pilot’s inability to maintain control of the helicopter due to his failure to maintain rotor speed. Contributing to the accident was the failure of the helicopter’s low rotor speed warning system. - [NTSB CEN22FA151](https://openairdocs.org/ntsb/CEN22FA151.md): Robinson Helicopter R44 · Rowlett, TX · Accident · 2 fatal · Class 3 · Field · Final report · Mar 25, 2022 · N514CD · Destroyed > A loss of helicopter control while maneuvering, which resulted in main rotor blade contact with the tailboom in flight, tail boom separation, and an uncontrolled descent. - [NTSB CEN21LA095](https://openairdocs.org/ntsb/CEN21LA095.md): Robinson Helicopter R44 · Morris, IL · Accident · Minor injuries · Class 4 · Limited · Final report · Dec 20, 2020 · N3264U · Substantial damage > The pilot's inadequate pedal application during liftoff with a tailwind, which resulted in a loss of yaw control and a subsequent impact with terrain. - [NTSB CEN21LA084](https://openairdocs.org/ntsb/CEN21LA084.md): Robinson R44 · Colorado City, TX · Accident · 2 fatal · Class 3 · Limited · Final report · Dec 10, 2020 · N7085Z · Destroyed > The pilot’s loss of control and exceedance of performance and/or structural limitations during low-altitude operations, which resulted in an inflight breakup.. Contributing to the accident was the pilot’s impairment from the effects of tetrahydrocannabinol. - [NTSB GAA19CA124](https://openairdocs.org/ntsb/GAA19CA124.md): Robinson R44 · Santa Maria Island, FL · Accident · Serious injuries · Data collection · Final report · Jan 2, 2019 · N772MG · Substantial damage > The pilot's loss of helicopter control while maneuvering at a low altitude after being struck in the head by a bird. - [NTSB GAA19CA063](https://openairdocs.org/ntsb/GAA19CA063.md): Robinson R44 · Knox City, TX · Accident · No injuries · Data collection · Final report · Nov 18, 2018 · N4167Y · Substantial damage > The pilot's failure to maintain adequate airspeed with a tailwind, which resulted in the helicopter settling with power, and his subsequent incorrect collective application while attempting to recover, which resulted in a loss of helicopter control due to a… - [NTSB GAA18CA450](https://openairdocs.org/ntsb/GAA18CA450.md): Robinson R44 · Lantana, FL · Accident · Minor injuries · Data collection · Final report · Jul 27, 2018 · N479AT · Substantial damage > The student pilot’s improper pitch control during landing, which resulted in a dynamic rollover. - [NTSB GAA18CA408](https://openairdocs.org/ntsb/GAA18CA408.md): Robinson R44 · Rulo, NE · Accident · No injuries · Data collection · Final report · Jul 10, 2018 · N144DJ · Substantial damage > The pilot's improper collective application, which resulted in low rotor rpm during the takeoff climb and a subsequent ground collision. Contributing to the accident was the pilot’s self-induced pressure to complete the operation. - [NTSB CEN14CA403](https://openairdocs.org/ntsb/CEN14CA403.md): Robinson Helicopter R44 · Allen, NE · Accident · Minor injuries · Data collection · Final report · Jul 31, 2014 · N7194H · Substantial damage > The pilot did not ensure sufficient obstacle clearance for potential wind conditions, which resulted in his loss of control of the helicopter. - [NTSB CEN13LA448](https://openairdocs.org/ntsb/CEN13LA448.md): Robinson R44 · Capron, IL · Accident · Serious injuries · Limited investigation · Final report · Jul 28, 2013 · N9681R · Substantial damage > The pilot's failure to maintain main rotor speed while maneuvering at low altitude during an agricultural application flight, which resulted in an uncontrolled descent into terrain. - [NTSB ANC10LA053](https://openairdocs.org/ntsb/ANC10LA053.md): Robinson Helicopter R44 · Unalaska, AK · Accident · 1 fatal · Limited investigation · Final report · Jun 20, 2010 · N333DV · Substantial damage > The pilot's inappropriate low altitude maneuvering, which resulted in a collision with terrain. - [NTSB ERA09FA497](https://openairdocs.org/ntsb/ERA09FA497.md): Robinson R44 · Jackson, MS · Accident · 1 fatal · Field investigation · Final report · Sep 1, 2009 · N33PX · Substantial damage > The pilot's failure to maintain adequate main rotor rpm, for undetermined reasons. ## 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_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 ('42353') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '240')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-events/240/cases?engine=42353 --- 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.