# NTSB investigations: Robinson Helicopter R44 II 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. Page 3 of 6 · 291 cases ## Cases, newest first - [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 WPR20FA013](https://openairdocs.org/ntsb/WPR20FA013.md): Robinson R44 · Las Vegas, NV · Accident · 2 fatal · Class 3 · Field · Final report · Oct 23, 2019 · N225JM · Substantial damage > An undetermined inflight event that resulted in the pilot performing an autorotation to uneven terrain for reasons that could not be determined due to the extent of impact damage. - [NTSB GAA19CA531](https://openairdocs.org/ntsb/GAA19CA531.md): Robinson R44 · Nuiqsut, AK · Accident · No injuries · Data collection · Final report · Sep 6, 2019 · N447PA · Substantial damage > The pilot's improper decision to land downwind from unsecured debris, which resulted in the helicopter’s main rotor disk ingesting foreign objects. - [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 GAA19CA473](https://openairdocs.org/ntsb/GAA19CA473.md): Robinson R44 · Fessenden, ND · Accident · Minor injuries · Data collection · Final report · Jul 31, 2019 · N3066T · Substantial damage > The pilot's failure to maintain clearance from wires during an agricultural application flight. - [NTSB CEN19LA240](https://openairdocs.org/ntsb/CEN19LA240.md): Robinson R44 · Blair, NE · Accident · Minor injuries · Class 3 · Limited · Final report · Jul 27, 2019 · N7508Z · Substantial damage > The failure of the lower actuator bearing support bracket, which resulted in the misalignment of the clutch actuator, the loss of belt tension on the main rotor drive system, and the subsequent forced landing on sloped terrain. - [NTSB GAA19CA428](https://openairdocs.org/ntsb/GAA19CA428.md): Robinson R44 · Council Bluff, IA · Accident · Minor injuries · Data collection · Final report · Jul 16, 2019 · N124LA · Substantial damage > The pilot's improper cyclic input during liftoff from a landing deck, which resulted in the right skid hooking onto an opening on the landing deck and a subsequent dynamic rollover. - [NTSB WPR19FA188](https://openairdocs.org/ntsb/WPR19FA188.md): Robinson R44 · Hayward, CA · Accident · 1 fatal · Class 3 · Field · Final report · Jul 15, 2019 · N144TG · Substantial damage > The pilots’ loss of control during a low altitude maneuver for undetermined reasons, which resulted in impact with terrain. - [NTSB ERA19TA204](https://openairdocs.org/ntsb/ERA19TA204.md): Robinson R44 · Parsons, WV · Accident · Serious injuries · Class 3 · Final report · Jun 29, 2019 · N883TY · Substantial damage > The pilot's decision to maneuver the helicopter at low altitude over a river, which resulted in a wire strike and subsequent collision with terrain. - [NTSB CEN19TA178](https://openairdocs.org/ntsb/CEN19TA178.md): Robinson R44 · La Ward, TX · Accident · No injuries · Class 3 · Final report · Jun 21, 2019 · N445AP · Substantial damage > The pilot’s failure to maintain helicopter control during a course reversal, which resulted in impact with terrain. - [NTSB GAA19CA476](https://openairdocs.org/ntsb/GAA19CA476.md): Robinson R44 · Lebanon, MO · Accident · No injuries · Data collection · Final report · Jun 9, 2019 · N724H · Substantial damage > The pilot's loss of yaw control and failure to maintain a proper descent rate and his subsequent improper use of the collective instead of the antitorque pedals to correct the yaw, which resulted in a hard landing. - [NTSB CEN19LA162](https://openairdocs.org/ntsb/CEN19LA162.md): Robinson R44 · Last Chance, CO · Accident · Minor injuries · Class 3 · Limited · Final report · Jun 8, 2019 · N4504L · Substantial damage > The pilot's failure to maintain adequate main rotor rpm while descending with a tailwind during an aerial application maneuver, which resulted in an uncontrolled descent into terrain. - [NTSB CEN19FA160](https://openairdocs.org/ntsb/CEN19FA160.md): Robinson R44 · Cass, AR · Accident · 3 fatal · Class 3 · Field · Final report · Jun 3, 2019 · N41351 · Substantial damage > A loss of engine power for reasons that could not be determined based on the available information. - [NTSB WPR19FA148](https://openairdocs.org/ntsb/WPR19FA148.md): Robinson R44 · Alpine, UT · Accident · 2 fatal · Class 3 · Field · Final report · May 17, 2019 · N744TW · Substantial damage > The noninstrument-rated pilot’s continued visual flight rules flight into instrument meteorological conditions, which resulted in spatial disorientation and subsequent loss of control. Contributing to the accident was hypoxia due to the high altitude at which… - [NTSB ERA19FA142](https://openairdocs.org/ntsb/ERA19FA142.md): Robinson R44 II · Tampa, FL · Accident · 1 fatal · Field investigation · Final report · Apr 4, 2019 · N4046J · Substantial damage > Contamination of and an inadequate bond between the two layers of fabric comprising the helicopter engine's air induction inlet duct, which resulted a partial collapse of the duct, obstruction of the airflow into the engine, and a total loss of engine power. - [NTSB GAA19CA195](https://openairdocs.org/ntsb/GAA19CA195.md): Robinson R44 · Taunton, MA · Accident · No injuries · Data collection · Final report · Apr 2, 2019 · N344R · Substantial damage > The pilot's improper decision to land with a gusting left quartering tailwind and his subsequent attempt to reposition the helicopter and take off, which resulted in a dynamic rollover. - [NTSB CEN19LA065](https://openairdocs.org/ntsb/CEN19LA065.md): Robinson R44 · Uvalde, TX · Accident · Minor injuries · Limited investigation · Final report · Jan 8, 2019 · N484AB · Substantial damage > The slipping of the sprag clutch due to galling of the sprags and corresponding sprag contact surfaces within the clutch assembly, which rendered the helicopter uncontrollable. - [NTSB GAA19CA110](https://openairdocs.org/ntsb/GAA19CA110.md): Robinson R44 · Grace, ID · Accident · No injuries · Data collection · Final report · Jan 3, 2019 · N4246Z · Substantial damage > The pilot's failure to maintain clearance from the power lines. - [NTSB GAA19CA103](https://openairdocs.org/ntsb/GAA19CA103.md): Robinson R44 · Strykersville, NY · Accident · No injuries · Data collection · Final report · Dec 18, 2018 · N7535S · Substantial damage > The structural failure of the home-built landing platform during landing, which resulted in the helicopter rolling over. - [NTSB GAA19CA066](https://openairdocs.org/ntsb/GAA19CA066.md): Robinson R44 · Lihue, HI · Accident · No injuries · Data collection · Final report · Nov 10, 2018 · N445KP · Substantial damage > The passenger’s improper decision to hold her cell phone outside the helicopter, which resulted in it departing the helicopter and striking the tail rotor. - [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 ERA18LA269](https://openairdocs.org/ntsb/ERA18LA269.md): Robinson R44 · Westminster, MD · Accident · No injuries · Limited investigation · Final report · Sep 30, 2018 · N440SH · Substantial damage > The pilot's attempt to move the helicopter from a sloped surface after an overspeed event, which resulted in a loss of helicopter control and impact with a car. The overspeed event resulted from misrouted and damaged wiring in the magneto, which subsequently… - [NTSB GAA18CA534](https://openairdocs.org/ntsb/GAA18CA534.md): Robinson R44 · Girdwood, AK · Accident · No injuries · Data collection · Final report · Aug 30, 2018 · N99645 · Substantial damage > The fisherman's fishing rod striking the helicopter’s rotating main rotor disk during loading. - [NTSB ANC18LA058](https://openairdocs.org/ntsb/ANC18LA058.md): Robinson R44 · Bettles, AK · Accident · No injuries · Limited investigation · Final report · Jul 29, 2018 · N744AK · Substantial damage > Maintenance personnel's application of insufficient preload on the attachment hardware for the idler gear shaft during engine overhaul, which resulted in the dismounting of the idler gear shaft assembly due to wear and deformation and the subsequent total… - [NTSB GAA18CA453](https://openairdocs.org/ntsb/GAA18CA453.md): Robinson R44 · Elma, IA · Accident · Minor injuries · Data collection · Final report · Jul 27, 2018 · N466EL · Substantial damage > The pilot's failure maintain clearance from power lines during an agricultural application flight. - [NTSB GAA18CA430](https://openairdocs.org/ntsb/GAA18CA430.md): Robinson R44 · Okawville, IL · Accident · No injuries · Data collection · Final report · Jul 9, 2018 · N944DC · Substantial damage > The pilot's improper preflight weight and balance calculation, which resulted in his operating the helicopter over its maximum gross takeoff weight and in its subsequent failure to climb. - [NTSB ERA18FA187](https://openairdocs.org/ntsb/ERA18FA187.md): Robinson R44 · Williamsburg, VA · Accident · 2 fatal · Field investigation · Final report · Jul 8, 2018 · N616HS · Destroyed > The pilot's failure to safely operate the helicopter due to his impaired cognitive and physical abilities, which resulted in a loss of control. - [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 WPR18LA133](https://openairdocs.org/ntsb/WPR18LA133.md): Robinson Helicopter R44 II · Borrego Springs, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Apr 30, 2018 · N423ML · Substantial damage > The loss of the helicopter’s drive system for reasons that could not be determined from the available evidence, which led to an autorotation that resulted in a hard landing and rollover on uneven sandy terrain. - [NTSB ANC18LA032](https://openairdocs.org/ntsb/ANC18LA032.md): Robinson Helicopter R44 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Apr 20, 2018 · N511CC · Substantial damage > The pilot's failure to maintain helicopter control while in a hovering turn, which resulted in a collision with obstacles. - [NTSB GAA18CA140](https://openairdocs.org/ntsb/GAA18CA140.md): Robinson Helicopter R44 · Woodland, CA · Accident · Minor injuries · Data collection · Final report · Feb 24, 2018 · N630ML · Substantial damage > The pilot’s distraction due to her malfunctioning iPad, which led to her inadvertent forward cyclic application. - [NTSB CEN18LA087](https://openairdocs.org/ntsb/CEN18LA087.md): Robinson Helicopter R44 II · Loveland, CO · Accident · Minor injuries · Limited investigation · Final report · Jan 26, 2018 · N878BC · 2 aircraft · Substantial damage > The airplane pilot’s failure to see and avoid the helicopter while in the traffic pattern, which resulted in a midair collision between the two aircraft. Contributing to the accident was the airplane pilot’s misunderstanding of the helicopter pilot’s… - [NTSB CEN18LA069](https://openairdocs.org/ntsb/CEN18LA069.md): Robinson Helicopter R44 II · Albany, TX · Accident · No injuries · Limited investigation · Final report · Jan 8, 2018 · N797JR · Substantial damage > A loss of helicopter control for reasons that could not be determined because postaccident examination did not reveal any evidence of mechanical malfunctions or failures of the main rotor and tail rotor systems that would have precluded normal operation. - [NTSB GAA18CA089](https://openairdocs.org/ntsb/GAA18CA089.md): Robinson Helicopter R44 · Newark, OH · Accident · Minor injuries · Data collection · Final report · Dec 13, 2017 · N441ML · Substantial damage > The pilot’s failure to maintain lateral control of the helicopter during takeoff, which resulted in dynamic rollover. - [NTSB GAA18CA066](https://openairdocs.org/ntsb/GAA18CA066.md): Robinson Helicopter R44 · New Orleans, LA · Accident · No injuries · Data collection · Final report · Nov 29, 2017 · N744WT · Substantial damage > The pilot’s failure to land the helicopter with both skids on the trailer platform, which resulted in a loss of control. - [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 ANC17LA040](https://openairdocs.org/ntsb/ANC17LA040.md): Robinson Helicopter R44 · Solomon, AK · Accident · No injuries · Class 3 · Limited · Final report · Aug 3, 2017 · N4138M · Substantial damage > The pilot's failure to maintain adequate altitude above water, and his loss of situational awareness, which resulted in an inadvertent descent and collision with water. - [NTSB GAA17CA450](https://openairdocs.org/ntsb/GAA17CA450.md): Robinson Helicopter R44 · Dunlap, IL · Accident · Minor injuries · Data collection · Final report · Jul 31, 2017 · N344MM · Substantial damage > The pilot’s failure to visually confirm that the helicopter was disconnected from hoses during refueling operations. Contributing to the accident was the pilot’s and ground crew’s misunderstanding of the hand signals. - [NTSB WPR17LA168](https://openairdocs.org/ntsb/WPR17LA168.md): Robinson Helicopter R44 II · Lake Sutherlin, MT · Accident · No injuries · Limited investigation · Final report · Jul 25, 2017 · N233JD · Substantial damage > The pilot’s transition into an out-of-ground-effect hover in high-density altitude conditions that exceeded the helicopter’s performance capabilities, which resulted in loss of rotor rpm. - [NTSB WPR17LA159](https://openairdocs.org/ntsb/WPR17LA159.md): Robinson Helicopter R44 II · Van Nuys, CA · Accident · Serious injuries · Limited investigation · Final report · Jul 21, 2017 · N3254E · Substantial damage > An improper repair of the right magneto's tachometer and governor signal wire, which failed during cruise flight and initiated a simultaneous malfunction of both the engine tachometer and governor control system, which resulted in erroneous and contradictory… - [NTSB CEN17CA346](https://openairdocs.org/ntsb/CEN17CA346.md): Robinson Helicopter R44 II · Logan, IA · Accident · Minor injuries · Data collection · Final report · Jul 20, 2017 · N192E · Substantial damage > The pilot’s failure to maintain clearance from a wire during an agricultural application flight. - [NTSB GAA17CA401](https://openairdocs.org/ntsb/GAA17CA401.md): Robinson Helicopter R44 · Paoli, IN · Accident · No injuries · Data collection · Final report · Jul 7, 2017 · N3203D · Substantial damage > The pilot's decision to maneuver an overgross weight helicopter at a low altitude and airspeed with a gusting tailwind, which resulted in a high descent rate and collision with terrain. Contributing to the accident was the pilot's self-induced pressure to… - [NTSB GAA17CA398](https://openairdocs.org/ntsb/GAA17CA398.md): Robinson Helicopter R44 II · Pocahontas, IL · Accident · No injuries · Data collection · Final report · Jul 7, 2017 · N62FA · Substantial damage > The helicopter pilot’s miscommunication with the ground crewmember during reloading operations, which resulted in a takeoff with the filler hose attached to the helicopter and subsequent impact with a truck. - [NTSB WPR17LA143](https://openairdocs.org/ntsb/WPR17LA143.md): Robinson Helicopter R44 II · Ronan, MT · Accident · Serious injuries · Limited investigation · Final report · Jul 6, 2017 · N442DR · Substantial damage > The pilot's failure to maintain adequate airspeed, which resulted in a loss of tail rotor effectiveness during a low-altitude orbiting maneuver and a subsequent hard landing. - [NTSB GAA17CA383](https://openairdocs.org/ntsb/GAA17CA383.md): Robinson Helicopter R44 · Easton, PA · Accident · No injuries · Data collection · Final report · Jul 4, 2017 · N3025J · Substantial damage > The pilot’s distraction during liftoff due to the tail rotor chip warning light illuminating, which resulted in the helicopter drifting right, the skid touching down, and a dynamic roll-over. - [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 CEN17LA219](https://openairdocs.org/ntsb/CEN17LA219.md): Robinson Helicopter R44 II · Douglas, WY · Accident · Serious injuries · Limited investigation · Final report · Jun 9, 2017 · N590GG · Substantial damage > The pilot's inability to control the helicopter's descent after encountering a sudden wind shift to a tailwind while performing a near maximum gross weight landing at a high density altitude. - [NTSB CEN17FA209](https://openairdocs.org/ntsb/CEN17FA209.md): Robinson Helicopter R44 II · Dimmitt, TX · Accident · 1 fatal · Field investigation · Final report · Jun 3, 2017 · N7091F · Substantial damage > The pilot's incapacitation due to scarring from previous heart attacks and severe hypertrophy of the left ventricular wall which resulted in arrhythmia and a loss of control while maneuvering at low altitude. - [NTSB GAA17CA279](https://openairdocs.org/ntsb/GAA17CA279.md): Robinson Helicopter R44 · Vevay, IN · Accident · No injuries · Data collection · Final report · May 10, 2017 · N428JG · Substantial damage > The pilot’s failure to see and avoid power lines during an agricultural application flight due to distraction when reading a map. - [NTSB ERA17LA168](https://openairdocs.org/ntsb/ERA17LA168.md): Robinson R44 · Newton, NC · Accident · Minor injuries · Limited investigation · Final report · Apr 27, 2017 · N728CB · Substantial damage > The pilot's failure to maintain an adequate airspeed during out-of-ground-effect maneuvering at a low airspeed with a tailwind, which resulted in a loss of helicopter control due to a loss of tail rotor effectiveness. Next page: https://openairdocs.org/ntsb.md?model=7640122&page=4 ## 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')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?model=7640122&page=3 --- 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.