# NTSB investigations: Robinson Helicopter R44 II: Loss of engine power (partial) 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 ANC26LA103](https://openairdocs.org/ntsb/ANC26LA103.md): Robinson Helicopter R44 II · Colquitt, GA · Accident · No injuries · Class 3 · Limited · Preliminary report · Sep 11, 2026 · N4026E · Substantial damage > On September 11, 2026 about 0830 eastern daylight time, a Robinson R44 helicopter, N4026E, was substantially damaged when it was involved in an accident near Colquitt, Georgia. The pilot was not injured. The helicopter was operated as a Title 14 Code of… - [NTSB CEN21LA369](https://openairdocs.org/ntsb/CEN21LA369.md): Robinson Helicopter R44 II · Wheeling, IL · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 11, 2021 · N4043B · Substantial damage > A partial loss of engine power for reasons that could not be determined based on available information. - [NTSB ERA20LA054](https://openairdocs.org/ntsb/ERA20LA054.md): Robinson R44 · San Antonio, TX · Accident · Minor injuries · Class 3 · Limited · Final report · Dec 14, 2019 · N440AH · Substantial damage > Maintenance personnel’s failure to complete all necessary steps of a service bulletin and subsequent failure to identify the loose lower actuator bearing support bracket during inspections, which resulted in the misalignment of the clutch actuator, resulted… - [NTSB CEN19LA250](https://openairdocs.org/ntsb/CEN19LA250.md): Robinson Helicopter R44 II · Lyons, NE · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 3, 2019 · N440EM · Substantial damage > The engine's low cylinder compression, which resulted in low rotor rpm and a subsequent dynamic rollover following landing on soft terrain. - [NTSB WPR19LA002](https://openairdocs.org/ntsb/WPR19LA002.md): Robinson R44 · Salinas, CA · Accident · No injuries · Class 3 · Limited · Final report · Oct 7, 2018 · N611TH · Substantial damage > The partial loss of engine power after takeoff due to faulty wiring to the engine governor. - [NTSB ERA18LA161](https://openairdocs.org/ntsb/ERA18LA161.md): Robinson Helicopter R44 II · Fort Morgan, AL · Accident · No injuries · Limited investigation · Final report · Jun 7, 2018 · N755KT · Substantial damage > A partial loss of engine power for reasons that could not be determined because postaccident engine examinations did not reveal any evidence of preimpact mechanical malfunctions or failures that would have precluded normal operation. - [NTSB WPR17LA188](https://openairdocs.org/ntsb/WPR17LA188.md): Robinson Helicopter R44 II · El Dorado Hills, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 26, 2017 · N61NM · Substantial damage > Maintenance personnel's inadequate routine maintenance on the helicopter engine, which led to low cylinder compression, improper magneto timing, and camshaft lobe wear, which subsequently resulted in degraded engine performance. - [NTSB WPR17LA140](https://openairdocs.org/ntsb/WPR17LA140.md): Robinson R44 · Bella Vista, CA · Accident · Serious injuries · Limited investigation · Final report · Jul 3, 2017 · N488AS · Substantial damage > A partial loss of engine power during low-altitude maneuvering for reasons that could not be determined because postaccident examinations of the engine and airframe revealed no evidence of any preaccident mechanical malfunctions or failures that would have… - [NTSB CEN15LA439](https://openairdocs.org/ntsb/CEN15LA439.md): Robinson Helicopter R44 II · Alice, TX · Accident · No injuries · Limited investigation · Final report · Sep 14, 2015 · N442CF · Substantial damage > A loss of engine power during a practice power recovery autorotation for reasons that could not be determined based on the available information. - [NTSB CEN15LA387](https://openairdocs.org/ntsb/CEN15LA387.md): Robinson R44 II · Cheyenne, WY · Accident · Serious injuries · Limited investigation · Final report · Aug 28, 2015 · N440SA · Substantial damage > The pilot's improper preflight performance planning, which resulted in a hard landing due to low rotor rpm while operating near maximum gross weight in high density altitude conditions. - [NTSB CEN15LA285](https://openairdocs.org/ntsb/CEN15LA285.md): Robinson Helicopter R44 II · Danville, AR · Accident · No injuries · Limited investigation · Final report · Jun 21, 2015 · N305CG · Substantial damage > The loss of engine power for reasons that could not be determined based on the available information. - [NTSB WPR12LA267](https://openairdocs.org/ntsb/WPR12LA267.md): Robinson Helicopter R44 II · Scottsdale, AZ · Accident · Minor injuries · Limited investigation · Final report · Jun 17, 2012 · N808WH · Substantial damage > The flight instructor’s failure to maintain adequate rotor rpm during a practice autorotation, which resulted in a loss of helicopter control and subsequent hard landing. - [NTSB ERA09LA421](https://openairdocs.org/ntsb/ERA09LA421.md): Robinson Helicopter R44 II · Dunedin, FL · Accident · No injuries · Limited investigation · Final report · Jul 24, 2009 · N645JC · Substantial damage > A partial loss of engine power 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.aircraft_model_code IN ('7640122', '7640123') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s.case_mkey = x.case_mkey AND s.aircrafts_position = x.position AND s."tier2Number" = '342' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-events/342/sequence?model=7640122 --- 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.