# Final NTSB investigations: Allison 250-C47 series

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 1 of 2 · 58 cases

## Latest cases

- [NTSB WPR26LA062](https://openairdocs.org/ntsb/WPR26LA062.md): Bell 407 · Las Vegas, NV · Accident · No injuries · Class 4 · Limited · Final report · Dec 15, 2025 · N404LL · Substantial damage
  > Tail rotor blade impact from an unidentified object at an undetermined time.
- [NTSB CEN25LA380](https://openairdocs.org/ntsb/CEN25LA380.md): Bell 407 · Decatur, TX · Accident · Minor injuries · Class 4 · Limited · Final report · Sep 16, 2025 · N407WA · Substantial damage
  > The instructor candidate’s erroneous operation of the throttle during an autorotation from altitude with power recovery, which resulted in a hard landing.
- [NTSB WPR24LA265](https://openairdocs.org/ntsb/WPR24LA265.md): Bell 407 · Raft River, ID · Accident · Minor injuries · Class 3 · Limited · Final report · Aug 3, 2024 · N20BH · Substantial damage
  > The pilot’s misdiagnosis of an erroneous engine instrument indication and his subsequent decision to enter an autorotation, which resulted in a hard landing due to degraded visual cues and low ambient light conditions. Contributing to the accident were the…
- [NTSB CEN24LA271](https://openairdocs.org/ntsb/CEN24LA271.md): Mcdonnell Douglas Helicopter 600N · Eagle Lake, TX · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 16, 2024 · N609RP · Destroyed
  > The operator’s improper installation of the fuel system, which resulted in fuel starvation, a loss of engine power, and impact with terrain.
- [NTSB WPR24LA247](https://openairdocs.org/ntsb/WPR24LA247.md): Bell 407 · Stanley, ID · Accident · Minor injuries · Class 4 · Limited · Final report · Jul 11, 2024 · N21BH · Substantial damage
  > A sudden wind shift which resulted in a rapid descent and subsequent dynamic rollover and collision into water.
- [NTSB CEN23FA019](https://openairdocs.org/ntsb/CEN23FA019.md): Bell 407 · Morgan City, LA · Accident · 1 fatal · Class 3 · Field · Final report · Oct 26, 2022 · N34BM · Destroyed
  > The pilot’s loss of consciousness due to a cardiovascular event.
- [NTSB WPR22LA333](https://openairdocs.org/ntsb/WPR22LA333.md): Bell 407 · Mount Baldy, CA · Accident · Serious injuries · Class 3 · Limited · Final report · Sep 4, 2022 · N687AM · Substantial damage
  > The pilot’s failure to ensure the throttle was properly positioned before commencing an approach to land, which resulted in a low rotor rpm condition and impact with terrain. Contributing to the accident was a worn throttle detent.
- [NTSB ANC22FA041](https://openairdocs.org/ntsb/ANC22FA041.md): Bell 407 · Kalea, HI · Accident · Serious injuries · Class 3 · Field · Final report · Jun 9, 2022 · N402SH · Substantial damage
  > The in-flight separation of the tail boom as a result of abnormal loading and fracture of the upper-left tail boom attachment bolt due to a gap between the upper-left longeron and aft fuselage bulkhead.
- [NTSB CEN22FA100](https://openairdocs.org/ntsb/CEN22FA100.md): Bell 407 · Houma, LA · Accident · 2 fatal · Class 3 · Field · Final report · Jan 14, 2022 · N167RL · Destroyed
  > The pilot’s sudden loss of consciousness for undetermined reasons during cruise flight, which resulted in a loss of control and impact with terrain.
- [NTSB CEN21LA116](https://openairdocs.org/ntsb/CEN21LA116.md): Mcdonnell Douglas Helicopter 600N · Mankato, MN · Accident · No injuries · Class 4 · Limited · Final report · Jan 22, 2021 · N60BK · Substantial damage
  > The pilot’s loss of situational awareness while landing, resulting in an impact with power lines.
- [NTSB WPR20LA235](https://openairdocs.org/ntsb/WPR20LA235.md): Mcdonnell Douglas 600 · Thompson Falls, MT · Accident · No injuries · Class 3 · Limited · Final report · Jul 21, 2020 · N208MP · Substantial damage
  > A partial loss of engine power for reasons that could not be determined based on available evidence.
- [NTSB WPR20LA228](https://openairdocs.org/ntsb/WPR20LA228.md): Md Helicopter 600 · San Andreas, CA · Accident · No injuries · Class 3 · Limited · Final report · Jul 20, 2020 · N745BW · Destroyed
  > The failure of the output shaft of the overrunning clutch inner race due to frictional overheating of the shaft, which resulted from the failure of the output bearing’s stainless-steel grease seal.
- [NTSB CEN20LA068](https://openairdocs.org/ntsb/CEN20LA068.md): Bell 407 · Minot, ND · Accident · No injuries · Class 3 · Limited · Final report · Jan 22, 2020 · N947LH · Substantial damage
  > The pilot's failure to maintain clearance from fencing around the landing pad during landing, which resulted in the tail rotor contacting the fence.
- [NTSB ERA20FA056](https://openairdocs.org/ntsb/ERA20FA056.md): Bell 407 · Headland, AL · Accident · 1 fatal · Class 3 · Field · Final report · Dec 25, 2019 · N663SF · Substantial damage
  > Pilot incapacitation by a sudden cardiac event related to severe coronary artery disease, which resulted in a loss of helicopter control.
- [NTSB CEN20FA035](https://openairdocs.org/ntsb/CEN20FA035.md): Bell 407 · Gulf of Mexico (Gulf of Mexico) · Accident · 2 fatal · Class 3 · Field · Final report · Dec 7, 2019 · N79LP · Destroyed
  > A total loss of engine power due to the failure of the engine’s Nos. 3 and 4 bearings and the power turbine pinion gear, and subsequent loss of main rotor rpm, which resulted in a loss of control and impact with the water.
- [NTSB CEN19FA095](https://openairdocs.org/ntsb/CEN19FA095.md): Bell 407 · Galliano, LA · Accident · 2 fatal · Class 2 · Field · Final report · Mar 10, 2019 · N577AL · Destroyed
  > The pilot's loss of control during cruise flight as a result of spatial disorientation while operating the helicopter in close proximity to terrain in marginal meteorological conditions.
- [NTSB ERA18FA122](https://openairdocs.org/ntsb/ERA18FA122.md): MD Helicopter 600 · Smethport, PA · Accident · 2 fatal · Field investigation · Final report · Apr 8, 2018 · N602BP · Destroyed
  > The helicopter pilot's failure to maintain adequate clearance during power line construction work, which resulted in the helicopter's main rotor striking and becoming entangled with a wire and a subsequent dynamic rollover and collision with terrain.…
- [NTSB CEN17FA112](https://openairdocs.org/ntsb/CEN17FA112.md): Bell 407 · Chauvin, LA · Accident · 1 fatal · Field investigation · Final report · Feb 27, 2017 · N1371 · Destroyed
  > The pilot's failure to maintain proper altitude resulting in a collision with water for reasons that could not be determined based on the available information.
- [NTSB CEN16LA386](https://openairdocs.org/ntsb/CEN16LA386.md): Bell 407 · Lawton, OK · Accident · Serious injuries · Limited investigation · Final report · Sep 29, 2016 · N361SF · Substantial damage
  > The pilot's loss of helicopter control during landing, which resulted in a hard landing and collision with a wall.
- [NTSB WPR16LA081](https://openairdocs.org/ntsb/WPR16LA081.md): Mcdonnell Douglas Helicopter 600N · Ashland, OR · Accident · No injuries · Limited investigation · Final report · Feb 5, 2016 · N745BW · Substantial damage
  > Fatigue cracking of a main rotor blade for reasons that could not be determined based on the available information.
- [NTSB WPR16FA037](https://openairdocs.org/ntsb/WPR16FA037.md): Bell 407 · McFarland, CA · Accident · 4 fatal · Field investigation · Final report · Dec 11, 2015 · N408FC · Destroyed
  > The pilot's loss of control and collision with terrain while attempting a course reversal after inadvertently entering an area of reduced visibility weather conditions. Contributing to the accident was the pilot's lack of recent experience with night time…
- [NTSB CEN16LA058](https://openairdocs.org/ntsb/CEN16LA058.md): Mcdonnell Douglas Helicopter 600N · Angleton, TX · Accident · Minor injuries · Limited investigation · Final report · Dec 7, 2015 · N607BP · Substantial damage
  > A loss of control while hovering for reasons that could not be determined, because postaccident examination revealed no mechanical anomalies or failures that would have precluded normal operation.
- [NTSB CEN16LA027](https://openairdocs.org/ntsb/CEN16LA027.md): Bell 407 · San Antonio, TX · Accident · No injuries · Limited investigation · Final report · Nov 3, 2015 · N496AE · Substantial damage
  > The failure of the No. 3 tail rotor adapter and shaft due to a loss of torque on the retaining nut. Contributing to the accident was the lack of a requirement to inspect the tail rotor assembly for security in the helicopter manufacturer's maintenance manual…
- [NTSB CEN15LA265](https://openairdocs.org/ntsb/CEN15LA265.md): Bell 407 · Pecan Island, LA · Accident · No injuries · Limited investigation · Final report · Jun 8, 2015 · N501PH · Substantial damage
  > The fatigue fracture of the tail rotor gearbox attachment studs, which resulted in a loss of tail rotor control and a subsequent hard landing.
- [NTSB GAA15CA002](https://openairdocs.org/ntsb/GAA15CA002.md): Bell 407 · Justin, TX · Accident · No injuries · Data collection · Final report · Mar 5, 2015 · N41BH · Substantial damage
  > Abnormal ground contact during an autorotation demonstration, resulting in a severed tailrotor driveshaft.
- [NTSB CEN15IA046](https://openairdocs.org/ntsb/CEN15IA046.md): Bell 407 · Viosca Knoll 989 · Incident · No injuries · Incident investigation · Final report · Nov 11, 2014 · N373RL · No damage
  > Engine power surges during takeoff for reasons that could not be determined during postaccident testing of the engine and the engine control unit.
- [NTSB CEN14FA232](https://openairdocs.org/ntsb/CEN14FA232.md): Bell 407 · Telluride, CO · Accident · No injuries · Field investigation · Final report · May 3, 2014 · N407MH · Substantial damage
  > The failure of the power turbine thrust (No. 5) bearing due to overheating as a result of oil starvation, which led to the engine failure. Also causal to the accident was an undocumented repair to the gearbox cover oil delivery tube port during which an…
- [NTSB WPR14LA173](https://openairdocs.org/ntsb/WPR14LA173.md): Mcdonnell Douglas Helicopter 600N · Adelanto, CA · Accident · Serious injuries · Limited investigation · Final report · Apr 27, 2014 · N606BP · Substantial damage
  > The commercial pilot’s improper control inputs, which resulted in a loss of helicopter control during takeoff.
- [NTSB CEN13FA491](https://openairdocs.org/ntsb/CEN13FA491.md): Bell 407 · Ship Shoal 208H (Gulf of Mexico) · Accident · Minor injuries · Field investigation · Final report · Aug 13, 2013 · N53LP · Substantial damage
  > The ingestion of vented methane gas into the helicopter’s engine during takeoff, which caused an engine compressor surge that led to a total loss of engine power.
- [NTSB CEN13FA003](https://openairdocs.org/ntsb/CEN13FA003.md): Bell 407 · Intracoastal City, LA · Accident · 1 fatal · Field investigation · Final report · Oct 5, 2012 · N406AL · Substantial damage
  > The pilot’s decision to attempt a local flight in marginal visual meteorological conditions and his subsequent loss of control following an inadvertent encounter with instrument metrological conditions shortly after takeoff.
- [NTSB ERA12TA538](https://openairdocs.org/ntsb/ERA12TA538.md): Bell 407 · Bath, NY · Accident · Minor injuries · Final report · Aug 31, 2012 · N11SP · Substantial damage
  > The pilot's improper recovery from an in-flight upset, which resulted in the main rotor striking and separating the tail boom. Contributing to the accident was the helicopter manufacturer's failure to warn pilots of unanticipated and unequal aft cyclic…
- [NTSB ANC12FA084](https://openairdocs.org/ntsb/ANC12FA084.md): Mcdonnell Douglas Helicopter 600N · Delta Junction, AK · Accident · 1 fatal · Field investigation · Final report · Aug 8, 2012 · N737TV · Substantial damage
  > The pilot’s failure to clear the left landing gear skid, which resulted in the entanglement of the left landing gear skid with a log, and his subsequent application of collective pitch, which resulted in a dynamic rollover.
- [NTSB CEN12LA242](https://openairdocs.org/ntsb/CEN12LA242.md): Bell 407 · Aberdeen, SD · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 2012 · N509MT · Substantial damage
  > The fatigue failure of two turbine engine blades due to vibration.
- [NTSB WPR09GA119](https://openairdocs.org/ntsb/WPR09GA119.md): Mcdonnell Douglas Helicopter 600 · San Clemente, CA · Accident · Serious injuries · Final report · Feb 20, 2009 · N608BP · Substantial damage
  > Failure of the engine’s number two bearing during cruise flight, which resulted in a loss of engine power.
- [NTSB DEN08MA116](https://openairdocs.org/ntsb/DEN08MA116.md): Bell 407 · Flagstaff, AZ · Accident · 7 fatal · Major investigation · Final report · Jun 29, 2008 · N407GA · 2 aircraft · Destroyed
  > Both helicopter pilots’ failure to see and avoid the other helicopter on approach to the helipad. Contributing to the accident were the failure of N407GA’s pilot to follow flight arrival route guidelines, and the failure of N407MJ’s pilot to follow…
- [NTSB CHI08CA098](https://openairdocs.org/ntsb/CHI08CA098.md): McDonnell Douglas 600N · Waverly, OH · Accident · Minor injuries · Data collection · Final report · Mar 26, 2008 · N160KC · Substantial damage
  > The pilot's improper flare.
- [NTSB DFW08IA045](https://openairdocs.org/ntsb/DFW08IA045.md): Bell 407 · Hig Island A595 · Incident · No injuries · Incident investigation · Final report · Dec 15, 2007 · N407AK · No damage
  > The loss of tail rotor effectiveness for undetermined reasons.
- [NTSB NYC07FA048](https://openairdocs.org/ntsb/NYC07FA048.md): Bell 407 · Dagsboro, DE · Accident · 2 fatal · Field investigation · Final report · Dec 14, 2006 · N407JJ · Substantial damage
  > The pilot's improper decision to depart under visual flight rules into night instrument meteorological conditions. Contributing to the accident was the fog and the dark night conditions.
- [NTSB DFW05FA040](https://openairdocs.org/ntsb/DFW05FA040.md): Bell 407 · Ship Shoal 130E · Accident · 1 fatal · Field investigation · Final report · Dec 17, 2004 · N976AA · Destroyed
  > The pilot's failure to maintain clearance with a stationary object while maneuvering for landing. Contributing factors were the inadequate facilities available for landing, the pilot's lack of information regarding the landing area, and the operational status…
- [NTSB SEA04MA167](https://openairdocs.org/ntsb/SEA04MA167.md): Bell 407 · Battle Mountain, NV · Accident · 5 fatal · Major investigation · Final report · Aug 22, 2004 · N2YN · Destroyed
  > The pilot's failure to maintain clearance from mountainous terrain. Contributing factors were the pilot's improper decision to take the direct route over mountainous terrain, the dark night conditions, and the pressure to complete the mission induced by the…
- [NTSB CHI04MA182](https://openairdocs.org/ntsb/CHI04MA182.md): Bell 407 · Newberry, SC · Accident · 4 fatal · Major investigation · Final report · Jul 13, 2004 · N503MT · Destroyed
  > The pilot's failure to maintain terrain clearance as a result of fog conditions. A contributing factor was inadequate weather and dispatch information relayed to the pilot.
- [NTSB FTW04LA117](https://openairdocs.org/ntsb/FTW04LA117.md): Bell 407 · Hurst, TX · Accident · No injuries · Limited investigation · Final report · Apr 27, 2004 · N407BP · Substantial damage
  > The student pilot's excessive flare prior to touchdown during the practice autorotation which resulted in the tailboom stinger striking the ground. A contributing factor was the flight instructor's delay to take remedial action.
- [NTSB NYC04CA049](https://openairdocs.org/ntsb/NYC04CA049.md): Bell B407 · Morehead, KY · Accident · No injuries · Data collection · Final report · Dec 21, 2003 · N508MT · Substantial damage
  > The ground personnel's failure to identify the hazardous condition. Factors were blowing snow and night conditions.
- [NTSB FTW04IA023](https://openairdocs.org/ntsb/FTW04IA023.md): Bell 407 · Eugene Is. 27 · Incident · No injuries · Incident investigation · Final report · Nov 16, 2003 · N405PH · Minor damage
  > The loss of engine power due to the failure of the 3rd stage turbine wheel and subsequent catastrophic failure of the turbine assembly.
- [NTSB FTW03TA156](https://openairdocs.org/ntsb/FTW03TA156.md): Bell 407 · Franklin, LA · Accident · No injuries · Final report · May 19, 2003 · N991SP · Substantial damage
  > The loss of tail rotor effectiveness due to the inadequate maintenance performed by other company personnel.
- [NTSB FTW03FA117](https://openairdocs.org/ntsb/FTW03FA117.md): Bell 407 · Houma, LA · Accident · No injuries · Field investigation · Final report · Mar 24, 2003 · N501PH · Substantial damage
  > The loss of tail rotor drive and anti-torque control resulting from the fracture and separation of the #5 tail rotor drive segment due to the overtemperature and subsequent failure of the #5 hangar bearing.
- [NTSB FTW03FA097](https://openairdocs.org/ntsb/FTW03FA097.md): Bell 407 · Mi 700 · Accident · 2 fatal · Field investigation · Final report · Feb 16, 2003 · N407HH · Destroyed
  > The catastrophic failure of the engine resulting from 1st stage turbine wheel blade failure due to type 1 hot corrosion (sulfidation). Contributing factors were the pilot's failure to brief the passengers on emergency safety equipment (life raft), the pilot's…
- [NTSB LAX03GA001](https://openairdocs.org/ntsb/LAX03GA001.md): McDonnell Douglas 600N · Rialto, CA · Accident · Serious injuries · Final report · Oct 4, 2002 · N625SB · Substantial damage
  > an engine deceleration event due to a loose HMU fuel line fitting, which was a result of inadequate maintenance procedures in the 100/300-hour inspection. Also causal was the flying pilot's and pilot-in-command's delayed recognition of the power loss, as well…
- [NTSB ATL02LA095](https://openairdocs.org/ntsb/ATL02LA095.md): McDonnell Douglas MD-600N · Deland, FL · Accident · No injuries · Limited investigation · Final report · May 10, 2002 · N810LA · Substantial damage
  > The pilot's failure to follow the FADEC malfunction checklist that resulted in the loss of rotor RPM, and the pilot's improper use of the flight controls during the precautionary landing that resulted in a hard landing. A factor was the malfunction of the…
- [NTSB NYC02TA026](https://openairdocs.org/ntsb/NYC02TA026.md): Bell 407 · Whitley City, KY · Accident · Serious injuries · Final report · Nov 12, 2001 · N11HX · Substantial damage
  > The pilots decision to operate the helicopter at an airspeed in excess of the maximum demonstrated stable airspeed for the water bucket. A factor in the accident was the pilot did not follow the published emergency procedure.

Next page: https://openairdocs.org/ntsb.md?engine=03029&status=final&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_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."completionStatus" = 'Completed'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03029'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03029&status=final

---
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.