# NTSB investigations: Allison 250-C20 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 2 of 8 · 372 cases

## Cases, newest first

- [NTSB ERA16LA104](https://openairdocs.org/ntsb/ERA16LA104.md): Bell 206 · Linden, NJ · Accident · Serious injuries · Limited investigation · Final report · Feb 6, 2016 · N206R · Substantial damage
  > The pilot receiving instruction's failure to maintain helicopter control during the initial takeoff, which resulted in a dynamic rollover. Contributing to the accident was the flight instructor's inadequate remedial action due to his distraction by looking…
- [NTSB ERA16LA030](https://openairdocs.org/ntsb/ERA16LA030.md): Hughes 369D · Marion, SC · Accident · No injuries · Limited investigation · Final report · Oct 30, 2015 · N920JP · Substantial damage
  > A momentary jam in the tail rotor control system from an undetermined source, resulting in a torsional fracture of the tail rotor control torque tube and a loss of helicopter control.
- [NTSB ERA16LA015](https://openairdocs.org/ntsb/ERA16LA015.md): Bell 206L 3 · Dickinson, AL · Accident · No injuries · Limited investigation · Final report · Oct 15, 2015 · N206CJ · Substantial damage
  > The improper installation by company maintenance personnel of the securing hardware of a tail rotor driveshaft section, which resulted in that section of tail rotor driveshaft disconnecting and a complete loss of tail rotor thrust.
- [NTSB CEN15LA423](https://openairdocs.org/ntsb/CEN15LA423.md): Bell 206B · Woodville, TX · Accident · Serious injuries · Limited investigation · Final report · Sep 24, 2015 · N648CA · Substantial damage
  > The loss of engine power due to water contamination in the fuel system. Contributing to the accident were the pilot’s inadequate preflight inspection of the fuel tanks and the operator’s inadequate inspection of the fuel supply truck that did not detect water…
- [NTSB ERA15LA337](https://openairdocs.org/ntsb/ERA15LA337.md): Mcdonnell Douglas Helicopter 369E · New Smyrna Beach, FL · Accident · Serious injuries · Limited investigation · Final report · Sep 3, 2015 · N16056 · Substantial damage
  > The pilot’s inadequate visual lookout and failure to maintain clearance from trees while maneuvering at low altitude.
- [NTSB GAA15CA102](https://openairdocs.org/ntsb/GAA15CA102.md): Bell 206 - B11 · Caledonia, MI · Accident · No injuries · Data collection · Final report · May 29, 2015 · N206ED · Substantial damage
  > A loss of tail rotor effectiveness while maneuvering at low altitude, resulting in a collision with trees.
- [NTSB ERA15CA055](https://openairdocs.org/ntsb/ERA15CA055.md): Mcdonnell Douglas Helicopter MD500 · Decatur, AL · Accident · No injuries · Data collection · Final report · Nov 18, 2014 · N8371F · Substantial damage
  > An undetermined pilot's failure to maintain clearance from an electrical transmission tower resulting in substantial damage to a main rotor blade. Postaccident investigation could not determine which of two pilots was flying the helicopter at the time the…
- [NTSB ERA15CA018](https://openairdocs.org/ntsb/ERA15CA018.md): Bell 206B · Prattville, AL · Accident · No injuries · Data collection · Final report · Oct 16, 2014 · N59541 · Substantial damage
  > The pilot's improper fuel planning, which resulted in a total loss of engine power due to fuel exhaustion.
- [NTSB CEN15CA007](https://openairdocs.org/ntsb/CEN15CA007.md): Bell 206B · Atlanta, AR · Accident · Serious injuries · Data collection · Final report · Oct 3, 2014 · N4426M · Substantial damage
  > The pilot's inadequate preflight inspection when he did not remove a tie-down strap prior to takeoff, which resulted in a dynamic rollover.
- [NTSB CEN14CA525](https://openairdocs.org/ntsb/CEN14CA525.md): Bell 206B · Nashoba, OK · Accident · No injuries · Data collection · Final report · Sep 25, 2014 · N152CA · Substantial damage
  > The pilot's loss of directional control due a loss of tail rotor effectiveness.
- [NTSB WPR14CA363](https://openairdocs.org/ntsb/WPR14CA363.md): Hughes 369D · Willows, CA · Accident · Serious injuries · Data collection · Final report · Sep 2, 2014 · N516PJ · Substantial damage
  > The pilot's failure to adequately secure cargo (a jacket), which resulted in the jacket exiting the cabin compartment and colliding with the tail rotor during cruise flight.
- [NTSB ERA14FA396](https://openairdocs.org/ntsb/ERA14FA396.md): Mcdonnell Douglas Helicopter 369E · Northport, AL · Accident · 2 fatal · Field investigation · Final report · Aug 19, 2014 · N444RS · Substantial damage
  > An inadvertent collision with a utility wire for reasons that could not be determined from recorded data and examination of the helicopter and accident site.
- [NTSB WPR14LA308](https://openairdocs.org/ntsb/WPR14LA308.md): Mdhi 369D · Oso, WA · Accident · Serious injuries · Limited investigation · Final report · Jul 22, 2014 · N5225C · Substantial damage
  > The pilot/mechanic’s failure to properly perform required inspections of the main rotor blades at the necessary intervals, which resulted in an in-flight separation of a main rotor blade due to disbonding and fatigue cracking. Contributing to the accident was…
- [NTSB CEN14LA296](https://openairdocs.org/ntsb/CEN14LA296.md): Bell 206B · Decatur, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 17, 2014 · N536T · Substantial damage
  > The flight instructor’s improper recovery from a practice autorotation, which resulted in a hard landing.
- [NTSB CEN14IA270](https://openairdocs.org/ntsb/CEN14IA270.md): Bell 407 · Eugene Island 182A · Incident · No injuries · Incident investigation · Final report · May 30, 2014 · N1197 · No damage
  > The improper repair of the outer combustion case, which led to its ultimate failure due to the continued progression of a fatigue crack and resulted in a partial loss of engine power during takeoff.
- [NTSB WPR14LA159](https://openairdocs.org/ntsb/WPR14LA159.md): Bell 206B III · Missoula, MT · Accident · Minor injuries · Limited investigation · Final report · Apr 4, 2014 · N43MA · Substantial damage
  > A dynamic rollover during attempted liftoff.
- [NTSB WPR14LA113](https://openairdocs.org/ntsb/WPR14LA113.md): Bell 206 · Bountiful, UT · Accident · No injuries · Limited investigation · Final report · Feb 5, 2014 · N3211N · Substantial damage
  > The pilots' inaccurate assessment of the snow depth on the landing zone, which resulted in a landing on snow deeper than that for which the helicopter was equipped and led to dynamic rollover.
- [NTSB WPR13GA374](https://openairdocs.org/ntsb/WPR13GA374.md): Mcdonnell Douglas Helicopter 369E · Burns, OR · Accident · No injuries · Final report · Aug 12, 2013 · N62PJ · Substantial damage
  > The total loss of engine power during cruise flight due to the separation of one of the 4th-stage turbine wheel blades due to low-cycle fatigue cracking that had progressed to high-cycle fatigue cracking, which ultimately led to the overload failure of the…
- [NTSB WPR13LA358](https://openairdocs.org/ntsb/WPR13LA358.md): Bell 206B · Chualar, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 4, 2013 · N90146 · Substantial damage
  > Maintenance personnel's failure to properly tighten the bolts securing the main driveshaft to the transmission, which resulted in fatigue failure of the bolts and disconnection of the driveshaft during low-altitude flight.
- [NTSB ERA13TA341](https://openairdocs.org/ntsb/ERA13TA341.md): Mcdonnell Douglas Helicopter 369E · Jackson, KY · Accident · Serious injuries · Final report · Jul 29, 2013 · N1608D · Destroyed
  > The helicopter pilot's inadvertent collision with an unmarked and uncharted utility wire of which he was unaware.
- [NTSB ERA13LA344](https://openairdocs.org/ntsb/ERA13LA344.md): Hughes 369D · Center Point, WV · Accident · Minor injuries · Limited investigation · Final report · Jul 29, 2013 · N31HM · Substantial damage
  > A total loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB ANC13LA066](https://openairdocs.org/ntsb/ANC13LA066.md): Cessna T207A · King Salmon, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 21, 2013 · N499K · Substantial damage
  > The pilot’s inadequate visual lookout while departing from a multiple-use waterway, which resulted in a collision with a drifting boat. Contributing to the accident were the lack of visual conspicuity of the boat and the limited amount of time the boat…
- [NTSB WPR13LA287](https://openairdocs.org/ntsb/WPR13LA287.md): Bell 206B · Royal City, WA · Accident · Serious injuries · Limited investigation · Final report · Jun 24, 2013 · N407FK · Substantial damage
  > The pilot's failure to maintain clearance from netting material during a low pass over trees, which resulted in a loss of helicopter control.
- [NTSB ERA13LA236](https://openairdocs.org/ntsb/ERA13LA236.md): Bell 206B · Hartford, KY · Accident · No injuries · Limited investigation · Final report · May 10, 2013 · N94PH · Substantial damage
  > The pilot’s failure to avoid a powerline that crossed a field that he was spraying. Contributing to the collision was the company’s failure to specifically mention that flight hazards be identified during a pre-work conference.
- [NTSB WPR13FA208](https://openairdocs.org/ntsb/WPR13FA208.md): Bell 206B · Shepherd, MT · Accident · 1 fatal · Field investigation · Final report · Apr 27, 2013 · N150SP · Substantial damage
  > The pilot’s loss of control while maneuvering during low-altitude operations due to sudden neurological impairment or incapacitation and the helicopter’s subsequent collision with power lines.
- [NTSB WPR13GA128](https://openairdocs.org/ntsb/WPR13GA128.md): Bell 206B · Eureka, NV · Accident · 1 fatal · Final report · Feb 18, 2013 · N20620 · Substantial damage
  > The pilot’s failure to maintain clearance from a wire while maneuvering during low-altitude operations. Contributing to the accident was task- and/or work-related fatigue.
- [NTSB WPR13CA057](https://openairdocs.org/ntsb/WPR13CA057.md): Hughes 369D · Sheridan, OR · Accident · Minor injuries · Data collection · Final report · Nov 27, 2012 · N163PJ · Substantial damage
  > The pilot’s failure to prevent the helicopter from entering a vortex ring state (settling with power) condition during an external load operation, which resulted in the helicopter’s main rotor blades impacting the truck.
- [NTSB CEN13FA009](https://openairdocs.org/ntsb/CEN13FA009.md): Bell 206B · Crowley, LA · Accident · 1 fatal · Field investigation · Final report · Oct 10, 2012 · N333DR · Substantial damage
  > The pilot’s failure to maintain clearance from the broadcast tower guy-wires.
- [NTSB WPR12LA328](https://openairdocs.org/ntsb/WPR12LA328.md): Hughes Helicopters 369E · The Dalles, OR · Accident · Serious injuries · Limited investigation · Final report · Jul 26, 2012 · N427WC · Substantial damage
  > The loss of engine power due to fuel starvation, which resulted from the fuel tank supply pickup becoming unported while the helicopter was pulling power lines.
- [NTSB CEN12FA321](https://openairdocs.org/ntsb/CEN12FA321.md): Bell 206-L4 · (Gulf of Mexico) · Accident · 1 fatal · Field investigation · Final report · May 28, 2012 · N7077F · Substantial damage
  > The pilot’s failure to maintain clearance from an obstacle while landing on an obstructed helipad, which resulted in a collision and loss of control. Contributing to the accident was the failure of the helipad owner to mark the helipad closed and the failure…
- [NTSB CEN12CA319](https://openairdocs.org/ntsb/CEN12CA319.md): Hughes 369HS · Delavan, MN · Accident · Serious injuries · Data collection · Final report · May 25, 2012 · N11ZX · Substantial damage
  > The pilot’s failure to maintain clearance with power lines during an aerial application flight.
- [NTSB WPR12LA125](https://openairdocs.org/ntsb/WPR12LA125.md): Aerospatiale AS 355F1 · Makakilo City, HI · Accident · No injuries · Limited investigation · Final report · Mar 3, 2012 · N101MZ · Substantial damage
  > A partial loss of engine power while maneuvering over rough/uneven terrain that was precipitated by the failure of a 3rd stage turbine blade as a result of high-cycle fatigue.
- [NTSB CEN11CA533](https://openairdocs.org/ntsb/CEN11CA533.md): Garlick Helicopters OH-58C · Rushford, MN · Accident · No injuries · Data collection · Final report · Jul 31, 2011 · N82855 · Substantial damage
  > The pilot's diverted attention, which resulted in the failure to maintain clearance from the power line.
- [NTSB CEN11CA509](https://openairdocs.org/ntsb/CEN11CA509.md): Bell 206B · Temple, OK · Accident · No injuries · Data collection · Final report · Jul 23, 2011 · N118TV · Substantial damage
  > The pilot’s failure to maintain clearance from static power lines.
- [NTSB CEN11CA303](https://openairdocs.org/ntsb/CEN11CA303.md): Bell 206 · Venice, LA · Accident · Minor injuries · Data collection · Final report · Apr 13, 2011 · N887T · Substantial damage
  > The pilot's improper use of the collective and cyclic control during taxi operations, which induced a dynamic rollover.
- [NTSB WPR11LA151](https://openairdocs.org/ntsb/WPR11LA151.md): Bell 206B-III · Tooele, UT · Accident · No injuries · Limited investigation · Final report · Mar 1, 2011 · N206BY · Substantial damage
  > The pilot did not maintain yaw control of the helicopter during a maneuvering hover. Contributing to the accident was the pilot’s lack of experience in the make and model helicopter.
- [NTSB CEN11WA042](https://openairdocs.org/ntsb/CEN11WA042.md): Agusta A109 · New Castle, United Kingdom · Accident · 3 fatal · Foreign investigation · Oct 23, 2010 · N2NR · Destroyed
- [NTSB CEN10CA545](https://openairdocs.org/ntsb/CEN10CA545.md): Aerospatiale AS 355F1 · Pikes Peak, CO · Accident · Serious injuries · Data collection · Final report · Sep 17, 2010 · N5802W · Substantial damage
  > The helicopter's encounter with an unexpected downdraft, which resulted in a hard landing.
- [NTSB WPR10CA314](https://openairdocs.org/ntsb/WPR10CA314.md): Bell 206B · Rickreall, OR · Accident · No injuries · Data collection · Final report · Jun 23, 2010 · N3194G · Substantial damage
  > A total loss of engine power due to fuel exhaustion as a result of the pilot's failure to ensure that adequate fuel was aboard for the flight.
- [NTSB ERA10LA238](https://openairdocs.org/ntsb/ERA10LA238.md): Mcdonnell Douglas Helicopter 369E · Newfane, VT · Accident · Serious injuries · Limited investigation · Final report · Apr 21, 2010 · N400MB · Substantial damage
  > The pilot's inadvertent encounter with a rope while maneuvering during powerline operations for undetermined reasons.
- [NTSB ERA10LA032](https://openairdocs.org/ntsb/ERA10LA032.md): Bell 206 · Eupora, MS · Accident · Serious injuries · Limited investigation · Final report · Oct 25, 2009 · N57PH · Destroyed
  > A loss of engine power due to fuel contamination of the helicopter’s fuel supply.
- [NTSB WPR10TA025](https://openairdocs.org/ntsb/WPR10TA025.md): Mcdonnell Douglas Helicopter 500N · Los Alamitos, CA · Accident · No injuries · Final report · Oct 16, 2009 · N521HB · Substantial damage
  > The flight instructor's delayed remedial action during the instructional autorotative landing, which resulted in a failure to maintain an adequate rotor rpm to avoid a hard landing.
- [NTSB CEN09LA571](https://openairdocs.org/ntsb/CEN09LA571.md): Messerschmitt-Boelkow-Blohm BO-105S · Thibodaux, LA · Accident · Minor injuries · Limited investigation · Final report · Sep 6, 2009 · N131EH · Substantial damage
  > The pilot's inability to maintain control due to the mechanic's inadvertent switching of two cyclic control tubes of different lengths during maintenance.
- [NTSB ERA09LA460](https://openairdocs.org/ntsb/ERA09LA460.md): Mcdonnell Douglas Helicopter 369E · Acworth, GA · Accident · Serious injuries · Limited investigation · Final report · Aug 12, 2009 · N527BB · Substantial damage
  > The loss of engine power due to the fatigue failure of the third-stage turbine wheel airfoil.
- [NTSB ERA09FA414](https://openairdocs.org/ntsb/ERA09FA414.md): Hughes 369 · Franklin, PA · Accident · 1 fatal · Field investigation · Final report · Jul 22, 2009 · N61735 · Substantial damage
  > A loss of engine power due to fuel exhaustion as a result of the pilot's fuel mismanagement.
- [NTSB WPR09CA338](https://openairdocs.org/ntsb/WPR09CA338.md): Bell 206B · Burlington, WA · Accident · No injuries · Data collection · Final report · Jul 11, 2009 · N302PD · Substantial damage
  > The pilot’s failure to maintain control of the helicopter while attempting to lift off from a trailer. The helicopter subsequently impacted the ground and rolled over.
- [NTSB CEN09CA275](https://openairdocs.org/ntsb/CEN09CA275.md): Bell 407 · High Island 138 · Accident · No injuries · Data collection · Final report · May 4, 2009 · N164RL · Substantial damage
  > The pilot's failure to maintain clearance from the windsock during the approach.
- [NTSB WPR09LA244](https://openairdocs.org/ntsb/WPR09LA244.md): Hughes 369HS · Pacific Ocean (Pacific Ocean) · Accident · No injuries · Limited investigation · Final report · Apr 5, 2009 · N2058X · Substantial damage
  > The pilot’s failure to maintain clearance from an object during takeoff from the deck of a fishing vessel.
- [NTSB CEN09IA222](https://openairdocs.org/ntsb/CEN09IA222.md): Bell 206 · Springfield, IL · Incident · No injuries · Incident investigation · Final report · Mar 17, 2009 · N595AE · Minor damage
  > The pilot's failure to maintain clearance from the parked helicopter.
- [NTSB ERA09WA183](https://openairdocs.org/ntsb/ERA09WA183.md): Bell 206B · St. Maarten, NT · Accident · No injuries · Foreign investigation · Mar 4, 2009 · N83086 · Substantial damage
  > None.

Next page: https://openairdocs.org/ntsb.md?engine=03020&page=3

## 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.engine_model_code IN ('03020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03020&page=2

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