# Final NTSB investigations: Allison 250 SER 250HP

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 6 · 263 cases

## Latest cases

- [NTSB WPR26LA277](https://openairdocs.org/ntsb/WPR26LA277.md): Bell 206B III · Stonewall, OK · Accident · Serious injuries · Class 4 · Limited · Final report · Jul 21, 2026 · N2193X · Substantial damage
  > The pilot’s failure to maintain clearance from power lines while conducting a low-altitude aerial application.
- [NTSB CEN25LA298](https://openairdocs.org/ntsb/CEN25LA298.md): Bell 47G · Assumption, MN · Accident · No injuries · Class 4 · Limited · Final report · Jul 31, 2025 · N102SH · Substantial damage
  > A total loss of engine power due to fuel starvation, which resulted from attitude-inducing unporting of the fuel.
- [NTSB ERA25LA156](https://openairdocs.org/ntsb/ERA25LA156.md): Bell 206 · Chamblee, GA · Accident · Serious injuries · Class 4 · Limited · Final report · Mar 21, 2025 · N5QV · Substantial damage
  > The pilot’s inadequate fuel planning, which resulted in a total loss of engine power during approach due to fuel exhaustion.
- [NTSB WPR25LA078](https://openairdocs.org/ntsb/WPR25LA078.md): Bell 206A · Lemoore, CA · Accident · No injuries · Class 4 · Limited · Final report · Jan 14, 2025 · N6255N · Destroyed
  > The pilot’s failure to maintain clearance from power lines while maneuvering at a low altitude.
- [NTSB ERA25LA059](https://openairdocs.org/ntsb/ERA25LA059.md): Bell 206B · Lakeland, FL · Accident · No injuries · Class 4 · Limited · Final report · Nov 21, 2024 · N422RH · Substantial damage
  > The pilot’s failure to maintain yaw control during a tailwind approach, which resulted in a loss of tail rotor effectiveness, an uncommanded spin, and subsequent hard landing.
- [NTSB ERA25LA027](https://openairdocs.org/ntsb/ERA25LA027.md): Bell Helicopter Textron 206L-1 · Canal Winchester, OH · Accident · No injuries · Class 4 · Limited · Final report · Oct 27, 2024 · N54AE · Substantial damage
  > An in-flight collision with a bird while in cruise flight.
- [NTSB CEN24LA368](https://openairdocs.org/ntsb/CEN24LA368.md): Bell 206 · Lexington, NE · Accident · Serious injuries · Class 4 · Limited · Final report · Sep 25, 2024 · N92PH · Substantial damage
  > The pilot’s failure to maintain proper clearance from powerlines.
- [NTSB ERA24LA148](https://openairdocs.org/ntsb/ERA24LA148.md): Hughes 369D · Belleville, WV · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 18, 2024 · N102SU · Substantial damage
  > The ingestion of foreign object debris into the engine, which resulted in a sudden loss of engine power and a subsequent collision with trees and terrain during the forced landing.
- [NTSB CEN24FA049](https://openairdocs.org/ntsb/CEN24FA049.md): MD Helicopters 600 · Sterling City, TX · Accident · 2 fatal · Class 3 · Field · Final report · Nov 29, 2023 · N745MB · Substantial damage
  > The pilot’s failure to maintain clearance from a power line pole’s static arm during forecasted gusting wind conditions, un-forecasted light turbulence, and un-forecasted low-level wind shear conditions, resulting in main rotor blade contact with the static…
- [NTSB CEN23LA048](https://openairdocs.org/ntsb/CEN23LA048.md): Hughes 369HS · Oxford, CO · Accident · No injuries · Class 4 · Limited · Final report · Nov 23, 2022 · N668M · Substantial damage
  > The designated pilot examiner’s failure to maintain a proper descent during a practice 180° autorotation which resulted in a hard landing.
- [NTSB CEN23LA025](https://openairdocs.org/ntsb/CEN23LA025.md): Bell 206 · Greenville, IL · Accident · Minor injuries · Class 3 · Limited · Final report · Nov 3, 2022 · N61KH · Substantial damage
  > The mechanic’s failure to inspect and clean the entire fuel nozzle assembly in accordance with the engine maintenance manual, which resulted in fuel starvation and a partial loss of engine power, an autorotation, and a hard landing.
- [NTSB CEN22LA009](https://openairdocs.org/ntsb/CEN22LA009.md): Bell 206 · Gonzales, LA · Accident · Minor injuries · Class 3 · Limited · Final report · Oct 6, 2021 · N373SP · Substantial damage
  > The student pilot’s failure to compensate for an unanticipated right yaw, which resulted in a loss of tail rotor effectiveness and helicopter control.
- [NTSB WPR21LA333](https://openairdocs.org/ntsb/WPR21LA333.md): Bell Helicopter Textron 206L-1 · Glide, OR · Accident · Serious injuries · Class 4 · Limited · Final report · Aug 27, 2021 · N303AE · Substantial damage
  > The pilot’s failure to maintain clearance from a tree during an aerial application.
- [NTSB CEN21LA139](https://openairdocs.org/ntsb/CEN21LA139.md): Hughes 369 · Kaufman, TX · Accident · No injuries · Class 4 · Limited · Final report · Feb 26, 2021 · N58431 · Substantial damage
  > The pilot’s failure to maintain clearance from a power line during low-level maneuvering.
- [NTSB WPR21LA084](https://openairdocs.org/ntsb/WPR21LA084.md): Hughes 369D · Winthrop, WA · Accident · No injuries · Class 4 · Limited · Final report · Jan 9, 2021 · N8612F · Substantial damage
  > The pilot’s failure to adequately monitor the environment which resulted in a collision with a snowbank and subsequent loss of control.
- [NTSB ERA21LA040](https://openairdocs.org/ntsb/ERA21LA040.md): Bell 206 · Raleigh, NC · Accident · No injuries · Class 4 · Limited · Final report · Nov 8, 2020 · N123NC · Substantial damage
  > The pilot's loss of helicopter control after entry into vortex ring state, which resulted in main rotor blade contact with the tailboom, and impact with the ground.
- [NTSB ERA21LA023](https://openairdocs.org/ntsb/ERA21LA023.md): Bell 206 · Zephyrhills, FL · Accident · No injuries · Class 3 · Limited · Final report · Oct 16, 2020 · N777CP · Substantial damage
  > Improper torquing of the “B” nut at the fuel control unit, which led to a total loss of engine power and subsequent autorotation that resulted in substantial damage.
- [NTSB CEN20LA328](https://openairdocs.org/ntsb/CEN20LA328.md): Bell 206 · Marathon, TX · Accident · 3 fatal · Class 3 · Limited · Final report · Aug 8, 2020 · N284S · Destroyed
  > The in-flight loss of helicopter control for reasons that could not be determined based on the available evidence.
- [NTSB CEN20LA113](https://openairdocs.org/ntsb/CEN20LA113.md): Bell 206 · Clark, MO · Accident · No injuries · Class 3 · Limited · Final report · Mar 5, 2020 · N32AE · Substantial damage
  > The fatigue failure of the pneumatic line for reasons that could not be determined, which resulted in a loss of engine power and subsequent hard landing.
- [NTSB WPR19LA194](https://openairdocs.org/ntsb/WPR19LA194.md): Bell 47G 3B 1 · Mosby, MT · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 13, 2019 · N3078G · Substantial damage
  > The pilot’s failure to account for environmental conditions conducive to a loss of tail rotor effectiveness, which resulted in a loss of tail rotor effectiveness and subsequent loss of control. Contributing to the accident was the pilot’s inappropriate…
- [NTSB ERA18LA020](https://openairdocs.org/ntsb/ERA18LA020.md): Bell 206 · Union City, TN · Accident · Minor injuries · Class 3 · Limited · Final report · Nov 8, 2017 · N275AE · Substantial damage
  > The pilot’s inadvertent slope landing and attempted recovery, which resulted in an incipient dynamic rollover, mast bumping, and separation of the main rotor.
- [NTSB CEN17LA174](https://openairdocs.org/ntsb/CEN17LA174.md): Bell 407 · Venice, LA · Accident · No injuries · Limited investigation · Final report · May 2, 2017 · N457PH · Substantial damage
  > An in-flight separation of the tip block from the tail rotor blade due to an inadequate blade repair, which resulted in a rotor imbalance sufficient to crack the gearbox attachment studs and gearbox support assembly, and inadequate postrepair test procedures,…
- [NTSB WPR17FA021](https://openairdocs.org/ntsb/WPR17FA021.md): Hughes 369 · Pukoo, HI · Accident · 2 fatal · Field investigation · Final report · Nov 16, 2016 · N81GG · Destroyed
  > The pilot's decision to continue visual flight into an area of instrument meteorological conditions at night in rain, which resulted in his geographic disorientation and controlled flight into terrain.
- [NTSB WPR17LA019](https://openairdocs.org/ntsb/WPR17LA019.md): Bell 206B · Yuma, AZ · Accident · Serious injuries · Limited investigation · Final report · Nov 11, 2016 · N914HH · Substantial damage
  > The pilot’s inability to maintain helicopter control after its skid got caught on the landing pad while he was maneuvering the helicopter to land on it, which resulted in a dynamic roll-over.
- [NTSB WPR16LA125](https://openairdocs.org/ntsb/WPR16LA125.md): Bell 206 · Bishop, CA · Accident · No injuries · Limited investigation · Final report · Jun 14, 2016 · N1076Y · Substantial damage
  > The pilot’s improper preflight weather planning, fuel planning, and fuel management, which resulted in fuel starvation and a loss of engine power. Contributing to the severity of the accident was the pilot's initiation of the landing flare at a high altitude,…
- [NTSB CEN16FA171](https://openairdocs.org/ntsb/CEN16FA171.md): Mcdonnell Douglas Helicopter 369E · Reedsville, WI · Accident · 1 fatal · Field investigation · Final report · May 4, 2016 · N629JK · Substantial damage
  > The failure of the power turbine governor's dual-spool bearing due to a lack of lubrication, which resulted in a complete loss of engine power and subsequent impact with terrain.
- [NTSB CEN15LA370](https://openairdocs.org/ntsb/CEN15LA370.md): Bell 206B · Cresco, IA · Accident · No injuries · Limited investigation · Final report · Aug 18, 2015 · N5743W · Substantial damage
  > The loss of engine power due to the high-cycle fatigue failure of the third-stage turbine wheel.
- [NTSB ERA15LA060](https://openairdocs.org/ntsb/ERA15LA060.md): Bell 206B · West Palm Beach, FL · Accident · No injuries · Limited investigation · Final report · Oct 25, 2014 · N418SV · Substantial damage
  > A hard landing for reasons that could not be determined based on the available evidence.
- [NTSB WPR14CA373](https://openairdocs.org/ntsb/WPR14CA373.md): Bell 407 · Moab, UT · Accident · Minor injuries · Data collection · Final report · Sep 11, 2014 · N142MA · Substantial damage
  > The pilot's failure to ensure adequate clearance from terrain while landing on sloped terrain.
- [NTSB WPR14FA310](https://openairdocs.org/ntsb/WPR14FA310.md): Bell 206A · Wenatchee, WA · Accident · 1 fatal · Field investigation · Final report · Jul 23, 2014 · N949FM · Substantial damage
  > The pilot's failure to maintain a proper decent rate and path, which resulted in a hard landing and dynamic rollover. Contributing to the accident was the pilot's impairment by a sedating medication.
- [NTSB WPR13LA390](https://openairdocs.org/ntsb/WPR13LA390.md): Bell Helicopter Textron 206L-1 · Payson, AZ · Accident · Serious injuries · Limited investigation · Final report · Aug 28, 2013 · N2018R · Substantial damage
  > A partial loss of engine power due to an overtemperature event that thermally damaged the turbine blades and vanes, which resulted in a hard landing.
- [NTSB WPR13CA206](https://openairdocs.org/ntsb/WPR13CA206.md): Bell Helicopter Textron 206L-1 · Grand Canyon, AZ · Accident · No injuries · Data collection · Final report · Apr 23, 2013 · N2072M · Substantial damage
  > The failure of the flight instructor and the pilot receiving instruction to recognize before entering the flare that the wind had shifted to a tailwind and terminate the practice autorotation.
- [NTSB WPR13FA119](https://openairdocs.org/ntsb/WPR13FA119.md): Bell 206B · Acton, CA · Accident · 3 fatal · Field investigation · Final report · Feb 10, 2013 · N59518 · Substantial damage
  > The pilot's decision to conduct a flight in dark night conditions with an illuminated cockpit light that degraded his visibility and his ability to identify and arrest the helicopter's descent while maneuvering, which resulted in controlled flight into…
- [NTSB CEN13CA145](https://openairdocs.org/ntsb/CEN13CA145.md): Hughes 369HS · London, OH · Accident · No injuries · Data collection · Final report · Jan 29, 2013 · N193M · Substantial damage
  > The pilot's failure to comply with established cold weather operating procedures, which resulted in a total loss of engine power. Contributing to the accident was the pilot's excessive aft cyclic input during the landing flare, which resulted in main rotor…
- [NTSB WPR12LA426](https://openairdocs.org/ntsb/WPR12LA426.md): Bell 206 - B · Mammoth Lakes, CA · Accident · No injuries · Limited investigation · Final report · Sep 19, 2012 · N222GR · Destroyed
  > The pilot’s inability to maintain sufficient main rotor rpm while maneuvering in high density altitude conditions, which resulted in a precautionary landing and subsequent rollover.
- [NTSB WPR12LA408](https://openairdocs.org/ntsb/WPR12LA408.md): Bell Helicopter Textron 206L-1 · Grand Canyon, AZ · Accident · No injuries · Limited investigation · Final report · Sep 9, 2012 · N5745Y · Substantial damage
  > A total loss of engine power during descent for reasons that could not be determined because postaccident engine examinations and testing revealed no evidence of an anomaly that would have precluded normal operation.
- [NTSB WPR12LA341](https://openairdocs.org/ntsb/WPR12LA341.md): Fairchild Hiller FH-1100 · Cody, WY · Accident · No injuries · Limited investigation · Final report · Jul 31, 2012 · N5038F · Substantial damage
  > The failure of a tail rotor driveshaft coupling due to fatigue.
- [NTSB WPR12CA236](https://openairdocs.org/ntsb/WPR12CA236.md): Bell 206B · Burbank, WA · Accident · No injuries · Data collection · Final report · May 30, 2012 · N106TV · Substantial damage
  > The failure of maintenance personnel to properly torque an air tube fitting, which resulted in a total loss of engine power.
- [NTSB CEN12LA258](https://openairdocs.org/ntsb/CEN12LA258.md): Bell 206B · Amarillo, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 26, 2012 · N2068X · Substantial damage
  > The pilot's failure to maintain helicopter control during landing in gusty wind conditions associated with a thunderstorm, which resulted in a loss of tail rotor effectiveness.
- [NTSB WPR12LA036](https://openairdocs.org/ntsb/WPR12LA036.md): Bell 206B · Woodburn, OR · Accident · Serious injuries · Limited investigation · Final report · Nov 14, 2011 · N16HA · Substantial damage
  > The pilot’s failure to maintain ground clearance while maneuvering with an external load line.
- [NTSB CEN11LA646](https://openairdocs.org/ntsb/CEN11LA646.md): Bell 206B · Spicewood, TX · Accident · No injuries · Limited investigation · Final report · Sep 15, 2011 · N3181J · Substantial damage
  > The pilot did not maintain adequate rotor rpm during a low-altitude maneuvering flight.
- [NTSB CEN11LA200](https://openairdocs.org/ntsb/CEN11LA200.md): Hughes 369D · Henryetta, OK · Accident · No injuries · Limited investigation · Final report · Feb 23, 2011 · N112AS · Substantial damage
  > Failure of the cyclic control system for reasons undetermined.
- [NTSB CEN11GA020](https://openairdocs.org/ntsb/CEN11GA020.md): Bell 206B · Clarkson Valley, MO · Accident · 1 fatal · Final report · Oct 15, 2010 · N96MP · Substantial damage
  > The total loss of engine power due to fuel exhaustion, which resulted from the pilot's inadequate preflight planning and decision-making, and his improper control inputs following the loss of engine power, which resulted in mast bumping and separation of the…
- [NTSB CEN10LA431](https://openairdocs.org/ntsb/CEN10LA431.md): Bell 47G-4A · Rochester, MN · Accident · 1 fatal · Limited investigation · Final report · Jul 24, 2010 · N124SH · Substantial damage
  > The total loss of engine power due to a high-cycle fatigue fracture of a first-stage compressor blade. The reason for the fracture could not be determined during postaccident examination.
- [NTSB WPR10CA100](https://openairdocs.org/ntsb/WPR10CA100.md): Bell 206B · Kalispell, MT · Accident · No injuries · Data collection · Final report · Jan 7, 2010 · N127TP · Substantial damage
  > The pilot's failure to maintain lateral drift control during landing.
- [NTSB ERA09LA194](https://openairdocs.org/ntsb/ERA09LA194.md): Hughes 369D · Lee, MA · Accident · Serious injuries · Limited investigation · Final report · Mar 10, 2009 · N369RT · Substantial damage
  > The pilot's failure to maintain clearance from the overhead wire.
- [NTSB ANC08LA127](https://openairdocs.org/ntsb/ANC08LA127.md): Bell Helicopter Textron 206L-1 · Homer, AK · Accident · Serious injuries · Limited investigation · Final report · Sep 26, 2008 · N305MH · Substantial damage
  > The pilot's failure to maintain clearance from power lines during an external load lift. Contributing to the accident was the pilot's lack of situational awareness.
- [NTSB NYC08LA287](https://openairdocs.org/ntsb/NYC08LA287.md): Bell 206A · Barnesville, PA · Accident · Serious injuries · Limited investigation · Final report · Aug 22, 2008 · N67AR · Substantial damage
  > The pilot's failure to maintain control of the helicopter during the low-speed, low-altitude maneuver which resulted in a loss of tail rotor effectiveness.
- [NTSB SEA08CA091](https://openairdocs.org/ntsb/SEA08CA091.md): Bell 206B · Oxnard, CA · Accident · No injuries · Data collection · Final report · Mar 11, 2008 · N7028J · Substantial damage
  > The pilot's failure to maintain clearance with terrain during an aerial application.
- [NTSB ANC08LA040](https://openairdocs.org/ntsb/ANC08LA040.md): Bell 206L · Nikolai, AK · Accident · Minor injuries · Limited investigation · Final report · Mar 4, 2008 · N404EH · Substantial damage
  > The pilot's inadequate compensation for wind conditions, and an inadvertent loss of tail rotor effectiveness while maneuvering. A factor contributing to the accident was wind gusts.

Next page: https://openairdocs.org/ntsb.md?engine=03002&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 ('03002', '03003'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03002&status=final

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