# NTSB investigations: Allison 250 series

A list on [Allison 250 series](https://openairdocs.org/engine/allison-250-series.md).

Matched to the registry by N-number and event date, newest first.

Page 1 of 2 · 89 investigations

- [NTSB ERA25LA137](https://openairdocs.org/ntsb/ERA25LA137.md): Beech A36TC · Lititz, PA · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 9, 2025 · N347M · Destroyed
  > The pilot’s failure to maintain adequate airspeed after takeoff due to his distraction by the opening of the cabin door, which resulted in an exceedance of the airplane’s critical angle of attack and an aerodynamic stall/mush condition at too low of an…
- [NTSB WPR24LA093](https://openairdocs.org/ntsb/WPR24LA093.md): Bell 47G-3B-1 · Garey, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Feb 23, 2024 · N2618W · Substantial damage
  > Maintenance personnel’s failure to properly check the torque paint on a fuel control unit B-nut, which resulted in the loosening of the B-nut, a loss of engine power at a low altitude, and a subsequent impact with terrain.
- [NTSB ERA21LA016](https://openairdocs.org/ntsb/ERA21LA016.md): Enstrom 480 · Woodstock, CT · Accident · Minor injuries · Class 4 · Limited · Final report · Oct 10, 2020 · N899RT · Substantial damage
  > The pilot’s failure to maintain control of the helicopter while attempting to land on a trailer in gusting wind conditions, which resulted in a dynamic rollover.
- [NTSB WPR20LA224](https://openairdocs.org/ntsb/WPR20LA224.md): Hiller UH 12D · Mehama, OR · Accident · 1 fatal · Class 3 · Limited · Final report · Jul 17, 2020 · N2297W · Destroyed
  > An in-flight separation of a tail rotor blade due to fatigue cracking and overstress, which resulted in a loss of directional control and subsequent ground impact.
- [NTSB ENG20WA035](https://openairdocs.org/ntsb/ENG20WA035.md): Cessna P210 · Moruya, Australia · Accident · Serious injuries · Foreign investigation · Dec 19, 2019 · N210BA · Substantial damage
- [NTSB CEN19TA280](https://openairdocs.org/ntsb/CEN19TA280.md): Bell 47G · Montrose, CO · Accident · Serious injuries · Class 3 · Final report · Aug 20, 2019 · N1170W · Substantial damage
  > A loss of engine power due to fuel starvation, which resulted from attitude-induced unporting of the fuel.
- [NTSB GAA19CA261](https://openairdocs.org/ntsb/GAA19CA261.md): Siai-Marchetti SM · Belgrade, MT · Accident · No injuries · Data collection · Final report · May 13, 2019 · N772DW · Substantial damage
  > The pilot receiving instruction's overapplication of rudder during the landing roll and his subsequent failure to maintain directional control, which resulted in a ground loop.
- [NTSB WPR19LA028](https://openairdocs.org/ntsb/WPR19LA028.md): Bell 430 · Kailua, HI · Accident · No injuries · Class 3 · Limited · Final report · Oct 27, 2018 · N430ST · Substantial damage
  > The separation of one of the tail rotors blades’ root enclosures due to improper repair.
- [NTSB CEN16LA335](https://openairdocs.org/ntsb/CEN16LA335.md): Cessna U206G · Cave-In-Rock, IL · Accident · Serious injuries · Limited investigation · Final report · Aug 25, 2016 · N891LL · Substantial damage
  > A total loss of engine power due to air entering the fuel system for reasons that could not be determined based on available information. Contributing to the accident was the pilot’s inability to restart the engine due to the check valve assembly design.
- [NTSB CEN16LA330](https://openairdocs.org/ntsb/CEN16LA330.md): Hiller UH 12D · Cokeville, WY · Accident · Minor injuries · Limited investigation · Final report · Aug 23, 2016 · N97TH · Substantial damage
  > Failure of the control rotor cuff due to fatigue.
- [NTSB GAA16CA293](https://openairdocs.org/ntsb/GAA16CA293.md): Bell 47G · Hastings, MN · Accident · No injuries · Data collection · Final report · Jun 8, 2016 · N25LB · Substantial damage
  > The pilot's failure to attain a positive rate of climb during takeoff from a service truck, which resulted in an impact with terrain and substantial damage to the tail boom and fuselage.
- [NTSB CEN15LA288](https://openairdocs.org/ntsb/CEN15LA288.md): Bell 407 - NO Series · South Timbalier 127 · Accident · Serious injuries · Limited investigation · Final report · Jun 28, 2015 · N311RL · Substantial damage
  > The pilot's lack of awareness of the severity of the gusting winds, which led to the helicopter being pushed off of the oil platform by a wind gust during engine start. Contributing to the accident was the unavailability of a nearby weather monitoring system.
- [NTSB ERA14LA361](https://openairdocs.org/ntsb/ERA14LA361.md): Hiller UH 12E · Wadesboro, NC · Accident · No injuries · Limited investigation · Final report · Jul 26, 2014 · N107HA · Substantial damage
  > A partial loss of engine power due to the failure of the No. 2 engine accessory gearbox bearing for reasons that could not be determined based on the available information.
- [NTSB WPR14CA280](https://openairdocs.org/ntsb/WPR14CA280.md): Bell 47G · Gaston, OR · Accident · No injuries · Data collection · Final report · Jul 3, 2014 · N684PC · Substantial damage
  > The pilot's inability to maintain control of the helicopter as a result of a hydraulic hose becoming entangled around the right skid.
- [NTSB CEN13WA156](https://openairdocs.org/ntsb/CEN13WA156.md): Cessna P210N · Charloeri, Belgium · Accident · 5 fatal · Foreign investigation · Feb 9, 2013 · N240PW · Destroyed
  > On February 9, 2013, about 0840 hours universal coordinated time, a Cessna P210N, United States registration N240PW, impacted terrain after takeoff from the Brussels South -- Charleroi Airport (EBCI), Charleroi, Belgium. The intended destination was Lyon,…
- [NTSB ERA12FA527](https://openairdocs.org/ntsb/ERA12FA527.md): Bell 407 · Abingdon, VA · Accident · 1 fatal · Field investigation · Final report · Aug 25, 2012 · N407N · Substantial damage
  > The pilot's improper decision to make a low-level departure over water in dark night conditions without lights, which resulted in controlled flight into the water. Contributing to the accident was the pilot's likely spatial disorientation due to a vestibular…
- [NTSB WPR12LA347](https://openairdocs.org/ntsb/WPR12LA347.md): Hiller UH-12D · Deer Island, OR · Accident · Minor injuries · Limited investigation · Final report · Aug 7, 2012 · N47035 · Substantial damage
  > A loss of helicopter control while maneuvering at low altitude for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR11LA379](https://openairdocs.org/ntsb/WPR11LA379.md): Bell 47G-3B-2 · Los Banos, CA · Accident · No injuries · Limited investigation · Final report · Aug 14, 2011 · N475AL · Substantial damage
  > The pilot’s inadequate preflight, and contamination of both the engine compressor section and the main rotor blades, which resulted in reduced performance of the engine and rotor system.
- [NTSB WPR10CA470](https://openairdocs.org/ntsb/WPR10CA470.md): Bell 47G · Gaston, OR · Accident · No injuries · Data collection · Final report · Sep 26, 2010 · N7860S · Substantial damage
  > The pilot's failure to maintain tail rotor clearance while landing on a transport trailer positioned on an uneven surface.
- [NTSB WPR10FA440](https://openairdocs.org/ntsb/WPR10FA440.md): Hiller UH 12E · Kamiah, ID · Accident · 3 fatal · Field investigation · Final report · Aug 31, 2010 · N67264 · Substantial damage
  > In-flight impact of a passenger's metal clipboard with the helicopter’s tail rotor, which resulted in destruction of the tail rotor and subsequent loss of control of the helicopter. The original location of the clipboard and how it became free could not be…
- [NTSB ERA10LA383](https://openairdocs.org/ntsb/ERA10LA383.md): Hiller UH-12E · Holly Hill, SC · Accident · Serious injuries · Limited investigation · Final report · Jul 29, 2010 · N104HH · Substantial damage
  > Maintenance personnel's improper inspection and cleaning of the fuel nozzle, which resulted in a total loss of engine power.
- [NTSB WPR09CA331](https://openairdocs.org/ntsb/WPR09CA331.md): Bell 47G-3B-2 · Ocean Shores, WA · Accident · Minor injuries · Data collection · Final report · Jul 7, 2009 · N8169J · Substantial damage
  > The pilot's failure to maintain clearance from the water while maneuvering due to the pilot's diverted attention.
- [NTSB WPR09LA069](https://openairdocs.org/ntsb/WPR09LA069.md): Hughes 369 · Honiara, Solomon Islands · Accident · 1 fatal · Limited investigation · Final report · Dec 28, 2008 · N104BN · Destroyed
  > The pilot's failure to remove the tail rotor pedal lock before attempting flight, resulting in a loss of control.
- [NTSB NYC08LA318](https://openairdocs.org/ntsb/NYC08LA318.md): Hiller UH-12E · Naruna, VA · Accident · No injuries · Limited investigation · Final report · Sep 16, 2008 · N3324F · Substantial damage
  > The fatigue failure of a main rotor blade drag strut.
- [NTSB CHI07LA277](https://openairdocs.org/ntsb/CHI07LA277.md): Bell 47G-5A · Anoka, MN · Accident · Minor injuries · Limited investigation · Final report · Aug 24, 2007 · N25LB · Substantial damage
  > The loss of helicopter pitch control for undetermined reasons during the aerial application maneuver and the pilot's inability to control the aircraft during the descent.. A contributing factor to the accident was the soft terrain.
- [NTSB ANC07LA062](https://openairdocs.org/ntsb/ANC07LA062.md): Hiller UH-12E · Skwentna, AK · Accident · No injuries · Limited investigation · Final report · Jul 10, 2007 · N146ET · Substantial damage
  > The pilot's failure to maintain clearance from a glacier, which resulted in a tail rotor strike during landing, and damage to the helicopter during an emergency descent/landing on rough/uneven terrain. Factors contributing to the accident were variable and…
- [NTSB CHI06CA242](https://openairdocs.org/ntsb/CHI06CA242.md): Bell 47G-5 · Sanborn, ND · Accident · No injuries · Data collection · Final report · Aug 23, 2006 · N2251W · Substantial damage
  > The pilot's failure to maintain clearance from the power lines during the aerial application flight. The power lines were a factor.
- [NTSB DFW05CA208](https://openairdocs.org/ntsb/DFW05CA208.md): Hiller UH-12E · Hampton, AR · Accident · Serious injuries · Data collection · Final report · Aug 10, 2005 · N535HA · Substantial damage
  > A loss of engine power due to fuel exhaustion as a result of the pilot's failure to refuel. A factor was unsuitable terrain to complete a successful autorotation.
- [NTSB IAD05LA080](https://openairdocs.org/ntsb/IAD05LA080.md): Navickas Load Runner 2000 · Hammonton, NJ · Accident · 2 fatal · Limited investigation · Final report · Jun 19, 2005 · N200LR · Destroyed
  > The pilot's inadequate in-flight decision, which resulted in fuel exhaustion and subsequent loss of engine power. A factor was the wooded area, into which, the pilot had to autorotate.
- [NTSB SEA05FA004](https://openairdocs.org/ntsb/SEA05FA004.md): Maule MT-7-420 · Bend, OR · Accident · No injuries · Field investigation · Final report · Oct 8, 2004 · N186SB · Substantial damage
  > Loss of engine power during takeoff climb for undetermined reasons. Rough terrain was a factor.
- [NTSB NYC03FA095](https://openairdocs.org/ntsb/NYC03FA095.md): Beech A36 · Farmingdale, NJ · Accident · 1 fatal · Field investigation · Final report · May 5, 2003 · N111TW · Substantial damage
  > The pilot's delayed decision to refuel, which resulted in fuel exhaustion and the subsequent loss of engine power.
- [NTSB ANC02LA081](https://openairdocs.org/ntsb/ANC02LA081.md): MBB BO-105S · Deadhorse, AK · Accident · No injuries · Limited investigation · Final report · Jul 23, 2002 · N491HL · Substantial damage
  > The pilot's failure to correct a settling-with-power condition during a helicopter landing flare/touchdown, resulting in a hard landing and roll over.
- [NTSB ATL02WA120](https://openairdocs.org/ntsb/ATL02WA120.md): Cessna P210N · Treasure Cay, Bahamas · Accident · No injuries · Foreign investigation · Jun 6, 2002 · N210BA · Substantial damage
- [NTSB IAD01FA066](https://openairdocs.org/ntsb/IAD01FA066.md): Hughes 369A · Perry, WV · Accident · 1 fatal · Field investigation · Final report · Jun 7, 2001 · N58963 · Destroyed
  > The pilot's continued VFR flight into instrument meteorological conditions, and his failure to maintain terrain clearance. A contributing factor was mountainous terrain.
- [NTSB MIA01LA055](https://openairdocs.org/ntsb/MIA01LA055.md): Hiller UH-12E · Cleveland, TN · Accident · No injuries · Limited investigation · Final report · Jan 5, 2001 · N112EC · Destroyed
  > The PIC's failure to follow safe operating procedures for the maintenance of the rotorcraft's external aerial application equipment, resulting in inadvertent activation of collective as he egressed the rotorcraft, causing unmanned flight, in-flight break-up,…
- [NTSB NYC00LA157](https://openairdocs.org/ntsb/NYC00LA157.md): Siai-Marchetti SF260TP · Norfolk, VA · Accident · Minor injuries · Limited investigation · Final report · Jun 9, 2000 · N43GP · Substantial damage
  > Fuel starvation of the engine, caused by the failure of the fuel transfer pump.
- [NTSB ATL00LA043](https://openairdocs.org/ntsb/ATL00LA043.md): Hiller UH-12ET · Stonesboro, SC · Accident · No injuries · Limited investigation · Final report · Apr 20, 2000 · N9762C · Substantial damage
  > The pilot's improper inflight decision not to refuel which resulted in fuel exhaustion and a total loss of engine power.
- [NTSB SEA99LA031](https://openairdocs.org/ntsb/SEA99LA031.md): Hiller UH-12E · Tensed, ID · Accident · Serious injuries · Limited investigation · Final report · Jan 19, 1999 · N67264 · Substantial damage
  > The pilot-in-command's inadequate fuel management which resulted in fuel exhaustion. Contributing factors were the absence of cautionary markings on the fuel gauge, and high trees at the accident site.
- [NTSB ATL99LA036](https://openairdocs.org/ntsb/ATL99LA036.md): Bell 47G-3B-2 · Murfreesboro, TN · Accident · No injuries · Limited investigation · Final report · Dec 30, 1998 · N123NM · Substantial damage
  > The pilot's inadequate flare and his diverted attention, which resulted in a hard landing.
- [NTSB CHI98LA339](https://openairdocs.org/ntsb/CHI98LA339.md): Enstrom 480 · Green Bay, WI · Accident · No injuries · Limited investigation · Final report · Sep 16, 1998 · N142CC · Substantial damage
  > the pilot's failure to maintain adequate rotor rpm during a practice autorotation.
- [NTSB CHI98FA313](https://openairdocs.org/ntsb/CHI98FA313.md): Hiller FH-1100 · Dewitt, MI · Accident · 1 fatal · Field investigation · Final report · Aug 14, 1998 · N8171U · Destroyed
  > The rotor failure/malfunction due to debonding of the tail rotor blade. Also causal was the inadequate maintenance inspection of the aircraft by the company and the improper maintenance procedure by other maintenance personnel.
- [NTSB IAD97WA088](https://openairdocs.org/ntsb/IAD97WA088.md): Beech A-36 · Lebury, United Kingdom · Accident · No injuries · Foreign investigation · Mar 14, 1997 · N250TP · Substantial damage
- [NTSB SEA97TA023](https://openairdocs.org/ntsb/SEA97TA023.md): Bell 47G-3B-1 · Fillmore, UT · Accident · 1 fatal · Final report · Oct 29, 1996 · N3098G · Substantial damage
  > inadequate procedure and inadequate monitoring by the pilot, the operator, and/or other personnel, which allowed one of three external cables to the seed bucket to become entangled with the right skid of the helicopter, resulting in an imbalance and loss of…
- [NTSB MIA96LA210](https://openairdocs.org/ntsb/MIA96LA210.md): Bell 47G-4A · Adel, GA · Accident · 1 fatal · Limited investigation · Final report · Aug 11, 1996 · N9472G · Destroyed
  > the pilot's misjudgment of clearance between the helicopter and the antenna. A factor relating to the accident was the pilot's use of a drug (medication) that had sedative effects.
- [NTSB SEA94LA149](https://openairdocs.org/ntsb/SEA94LA149.md): Hiller-Soloy UH-12L4 · Clarkston, WA · Accident · Minor injuries · Limited investigation · Final report · Jun 14, 1994 · N67264 · Substantial damage
  > Disconnection of the ballast bar aft retaining pin. Factor(s) were: tail rotor blade separation and reduced aircraft control.
- [NTSB SEA94LA039](https://openairdocs.org/ntsb/SEA94LA039.md): Hiller-Soloy UH-12D · Sublimity, OR · Accident · No injuries · Limited investigation · Final report · Dec 7, 1993 · N2297W · Substantial damage
  > Fuel exhaustion due to inadequate preflight and refueling not acomplished.
- [NTSB SEA94LA037](https://openairdocs.org/ntsb/SEA94LA037.md): Hiller UH-12D · Sublimity, OR · Accident · No injuries · Limited investigation · Final report · Nov 26, 1993 · N59366 · Substantial damage
  > The pilot's failure to maintain clearance from unmarked transmission wires. Factors include the pilot's inadequate visual lookout, and unmarked wires in the area of operation.
- [NTSB LAX94LA054](https://openairdocs.org/ntsb/LAX94LA054.md): Hiller UH-12E · Salinas, CA · Accident · Minor injuries · Limited investigation · Final report · Nov 20, 1993 · N161HA · Substantial damage
  > a fatigue failure of the torsion-tension bar pin due to fretting corrosion. A factor in this accident was an inadequate quality of material utilized in the manufacture of the pin.
- [NTSB SEA94LA029](https://openairdocs.org/ntsb/SEA94LA029.md): Bell 47G3B2 · Toledo, WA · Accident · No injuries · Limited investigation · Final report · Nov 9, 1993 · N8169J · Substantial damage
  > Transmission shear bolts failed causing a loss of power to the rotor system, and the pilot encountered unsuitable terrain during his autorotation attempt.
- [NTSB MIA92LA014](https://openairdocs.org/ntsb/MIA92LA014.md): Bell 47G-5 · La Belle, FL · Accident · No injuries · Limited investigation · Final report · Oct 13, 1991 · N1201W · Substantial damage
  > The pilot in command's improper aft application of cyclic control during an autorotative landing to an open field, resulting in the main rotor blades colliding with the tail boom. Contributing to the accident was the in flight failure of the outer bearing of…

Next page: https://openairdocs.org/engine/allison-250-series/ntsb.md?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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey
WHERE a.engine_model_code IN ('03014', '03019')
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-series/ntsb

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