NTSB investigations: Robinson Helicopter R44 II
13 cases on aircraft the registry lists as Robinson Helicopter R44 II, where the sequence of events included Loss of engine power (partial). 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
| 2009 | 1 |
|---|---|
| 2012 | 1 |
| 2015 | 3 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 2 |
| 2021 | 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.\"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"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.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" 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 ANC26LA103Accident · No injuriesClass 3 · LimitedPreliminary reportRobinson Helicopter R44 II · Colquitt, GAOn 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 CEN21LA369Accident · Minor injuriesClass 3 · LimitedFinal reportRobinson Helicopter R44 II · Wheeling, ILA partial loss of engine power for reasons that could not be determined based on available information.NTSB ERA20LA054Accident · Minor injuriesClass 3 · LimitedFinal reportRobinson R44 · San Antonio, TXMaintenance 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 CEN19LA250Accident · Minor injuriesClass 3 · LimitedFinal reportRobinson Helicopter R44 II · Lyons, NEThe engine's low cylinder compression, which resulted in low rotor rpm and a subsequent dynamic rollover following landing on soft terrain.NTSB WPR19LA002Accident · No injuriesClass 3 · LimitedFinal reportRobinson R44 · Salinas, CAThe partial loss of engine power after takeoff due to faulty wiring to the engine governor.NTSB ERA18LA161Accident · No injuriesLimited investigationFinal reportRobinson Helicopter R44 II · Fort Morgan, ALA 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 WPR17LA188Accident · Minor injuriesLimited investigationFinal reportRobinson Helicopter R44 II · El Dorado Hills, CAMaintenance 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 WPR17LA140Accident · Serious injuriesLimited investigationFinal reportRobinson R44 · Bella Vista, CAA 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 CEN15LA439Accident · No injuriesLimited investigationFinal reportRobinson Helicopter R44 II · Alice, TXA loss of engine power during a practice power recovery autorotation for reasons that could not be determined based on the available information.NTSB CEN15LA387Accident · Serious injuriesLimited investigationFinal reportRobinson R44 II · Cheyenne, WYThe 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 CEN15LA285Accident · No injuriesLimited investigationFinal reportRobinson Helicopter R44 II · Danville, ARThe loss of engine power for reasons that could not be determined based on the available information.NTSB WPR12LA267Accident · Minor injuriesLimited investigationFinal reportRobinson Helicopter R44 II · Scottsdale, AZThe 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 ERA09LA421Accident · No injuriesLimited investigationFinal reportRobinson Helicopter R44 II · Dunedin, FLA partial loss of engine power for undetermined reasons.