# 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 4 of 8 · 372 cases

## Cases, newest first

- [NTSB DFW05FA032](https://openairdocs.org/ntsb/DFW05FA032.md): Hughes 369D · Zachary, LA · Accident · Serious injuries · Field investigation · Final report · Dec 9, 2004 · N7148Z · Substantial damage
  > The loss of engine power as a result of fatigue cracking of the compressor adaptor coupling initiated by fretting on the pilot diameter and subsequent disconnection of the compressor from the turbine assembly. A contributing factor was the low operating…
- [NTSB DEN05LA024](https://openairdocs.org/ntsb/DEN05LA024.md): Bell 206B3 · Eureka, UT · Accident · No injuries · Limited investigation · Final report · Nov 13, 2004 · N130JH · Substantial damage
  > the pilot's improper in-flight planning and decision making and failure to maintain obstacle clearance, resulting in contact with a power transmission line. Contributing factors include the intentional low-level maneuver, the power transmission line, and the…
- [NTSB MIA05FA008](https://openairdocs.org/ntsb/MIA05FA008.md): Eurocopter Deutschland BO-105 CBS5 · Santa Rosa Bch, FL · Accident · 3 fatal · Field investigation · Final report · Oct 20, 2004 · N916SH · Destroyed
  > The pilot's spatial disorientation and in-flight loss of control of the helicopter after encountering night instrument meteorological conditions resulting in collision with water during the resultant uncontrolled descent. A factor in the accident was the…
- [NTSB MIA04LA132](https://openairdocs.org/ntsb/MIA04LA132.md): Bell 206L · Gulf of Mexico · Accident · No injuries · Limited investigation · Final report · Sep 29, 2004 · N34CA · Destroyed
  > A loss of engine power for undetermined reasons while on short final to land on an oil platform in the Gulf of Mexico, which resulted in the pilot ditching the helicopter into the water.
- [NTSB MIA04LA129](https://openairdocs.org/ntsb/MIA04LA129.md): Bell 206B3 · Starkville, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 25, 2004 · N96PH · Substantial damage
  > The operator's inadequate maintenance inspections and the pilot's inadequate preflight inspection, which resulted in the helicopter being operated with a contaminated fuel system, that resulted in fuel starvation, and the loss of engine power.
- [NTSB FTW04TA237](https://openairdocs.org/ntsb/FTW04TA237.md): Bell OH-58C · Beaumont, TX · Accident · 1 fatal · Final report · Sep 16, 2004 · N9273T · Destroyed
  > **This probable cause was modified on 2/22/2016. Please see the public docket for this accident for additional details.** The pilot's failure to maintain a safe altitude, resulting in collision with the water. A factor was the dark night.
- [NTSB ATL04LA181](https://openairdocs.org/ntsb/ATL04LA181.md): Hughes HU-369-D · Waynesboro, GA · Accident · Minor injuries · Limited investigation · Final report · Sep 10, 2004 · N5211R · Substantial damage
  > The tail rotor assembly failed due to a fatigue fracture of the input gearshaft in the tail rotor gearbox assembly, which resulted in a loss of tail rotor control and subsequent collision with trees.
- [NTSB SEA04LA181](https://openairdocs.org/ntsb/SEA04LA181.md): Hughes 369D · Cottage Grove, OR · Accident · No injuries · Limited investigation · Final report · Sep 4, 2004 · N505ST · Substantial damage
  > In-flight loss of engine power during cruise for undetermined reasons.
- [NTSB MIA04LA123](https://openairdocs.org/ntsb/MIA04LA123.md): Bell 206B3 · Panama City, FL · Accident · No injuries · Limited investigation · Final report · Aug 24, 2004 · N107PH · Substantial damage
  > Inadequate maintenance inspection resulting in the partial loss of engine power due to a loose pneumatic line on the governor and ditching of the helicopter.
- [NTSB MIA04LA121](https://openairdocs.org/ntsb/MIA04LA121.md): McDonnell Douglas 369E · Ochopee, FL · Accident · Minor injuries · Limited investigation · Final report · Aug 19, 2004 · N42928 · Substantial damage
  > The pilot's loss of control in flight for undetermined reasons, which resulted in an uncontrolled descent, and subsequent impact with trees and the terrain.
- [NTSB SEA04TA163](https://openairdocs.org/ntsb/SEA04TA163.md): Bell 206B · Mead, WA · Accident · 1 fatal · Final report · Aug 17, 2004 · N34698 · Destroyed
  > The reversal of the reel machine during a sock line pull which resulted in a loss of control while hovering out of ground effect. Factors were the failure of company management to develop adequate procedures for conducting sock line pulls, the inadequate…
- [NTSB LAX04CA315](https://openairdocs.org/ntsb/LAX04CA315.md): Bell 206B · Kahului, HI · Accident · Minor injuries · Data collection · Final report · Aug 16, 2004 · N529RS · Substantial damage
  > the pilot's inadequate compensation for the gusty crosswind conditions, which resulted in a dynamic rollover. Contributing factors were the direct crosswind and his lack of total experience in the accident helicopter make and model.
- [NTSB FTW04LA197](https://openairdocs.org/ntsb/FTW04LA197.md): Bell 206B · East Cameron 13 · Accident · Minor injuries · Limited investigation · Final report · Jul 21, 2004 · N133RT · Substantial damage
  > The loss of engine power due to fuel exhaustion. Contributing factors were the fuel quantity gauge's improper fuel level indication, missing instrument placard, company maintenance personnel's improper maintenance records, disregard for company procedures,…
- [NTSB FTW04GA076](https://openairdocs.org/ntsb/FTW04GA076.md): Schweizer 269D · San Antonio, TX · Accident · Minor injuries · Final report · Feb 19, 2004 · N255TP · Substantial damage
  > The loss of engine power due to the axial movement of the compressor rotor blades contacting the compressor vanes resulting in a subsequent compressor stall. A contributing factor was the improper assembly of the compressor section during the engine overhaul…
- [NTSB FTW04TA075](https://openairdocs.org/ntsb/FTW04TA075.md): Bell 206B · Decatur, TX · Accident · Minor injuries · Final report · Feb 18, 2004 · N16MV · Destroyed
  > The pilot's failure to maintain control of the helicopter during liftoff after encountering dynamic rollover. A contributing factor was the rough and uneven terrain.
- [NTSB LAX04LA116](https://openairdocs.org/ntsb/LAX04LA116.md): Hughes 369D · Wahiawa, HI · Accident · No injuries · Limited investigation · Final report · Dec 18, 2003 · N1113L · Substantial damage
  > The pilot's failure to properly secure the external sling load, which allowed the load to shift, and subsequently strike and remove the tail rotor.
- [NTSB CHI04LA027](https://openairdocs.org/ntsb/CHI04LA027.md): Bell 206B · Coleman, WI · Accident · Minor injuries · Limited investigation · Final report · Nov 3, 2003 · N3198C · Destroyed
  > The loss of engine power for undetermined reasons and the unsuitable terrain encountered for the forced landing. The garage building was a factor.
- [NTSB CHI04LA017](https://openairdocs.org/ntsb/CHI04LA017.md): Hughes 369HS · Evansville, MN · Accident · Minor injuries · Limited investigation · Final report · Oct 21, 2003 · N49TJ · Substantial damage
  > The pilot's misjudgment of clearance from the surface of the lake during the aerial application pass. The low altitude operation, glassy water, and his visual perception were contributing factors.
- [NTSB FTW03LA216](https://openairdocs.org/ntsb/FTW03LA216.md): Bell 206B-3 · Kisatchie, LA · Accident · No injuries · Limited investigation · Final report · Sep 9, 2003 · N197AA · Substantial damage
  > A loss of engine power due to water contamination in the fuel system.
- [NTSB FTW03LA197](https://openairdocs.org/ntsb/FTW03LA197.md): Bell 206B · Mason, TX · Accident · Minor injuries · Limited investigation · Final report · Aug 20, 2003 · N9877Z · Substantial damage
  > The pilot's failure to maintain clearance with the power line. A contributing factor was the sunglare.
- [NTSB SEA03FA169](https://openairdocs.org/ntsb/SEA03FA169.md): Aerospatiale AS350D · Webb, ID · Accident · Serious injuries · Field investigation · Final report · Aug 13, 2003 · N57731 · Substantial damage
  > An over temperature condition within the gas generator turbine which led to first stage turbine blade fatigue as well as first stage blade track warping and consequent blade tip rub. The fatigue and blade tip rub ultimately led to blade separation and failure…
- [NTSB MIA03TA152](https://openairdocs.org/ntsb/MIA03TA152.md): Bell BHT-206-B3 · Fort Myers, FL · Accident · No injuries · Final report · Jul 30, 2003 · N876M · Substantial damage
  > The pilot's failure to adequately clear the right skid of obstructions which resulted in a dynamic rollover to the right during takeoff and damage to the helicopter.
- [NTSB ANC03LA073](https://openairdocs.org/ntsb/ANC03LA073.md): Bell 206B · Aniak, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 2003 · N111MT · Substantial damage
  > The compressor discharge pressure line (Pc line) B-nut coming loose at the fuel control unit, which resulted in a total loss of engine power, and subsequent in-flight collision with trees during an autorotation. A factor associated with the accident was the…
- [NTSB CHI03LA172](https://openairdocs.org/ntsb/CHI03LA172.md): Bell 206B · Baxter, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 20, 2003 · N79BH · Substantial damage
  > The pilot's failure to maintain control of the helicopter due to a loss of tail rotor effectiveness. Factors contributing to this accident were the helicopter's low airspeed, low altitude, the crosswind, and the trees.
- [NTSB MIA03FA120](https://openairdocs.org/ntsb/MIA03FA120.md): Aerospatiale AS355F1 · Madison, FL · Accident · Minor injuries · Field investigation · Final report · Jun 11, 2003 · N217ES · Substantial damage
  > The pilot in command's diverted attention and loss of control while attempting to takeoff, which resulted in the main rotor blades being dragged, and the helicopter rolling over.
- [NTSB LAX03LA183](https://openairdocs.org/ntsb/LAX03LA183.md): Bell 206B · Malone, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 6, 2003 · N242TK · Substantial damage
  > a fuel starvation induced loss of engine power due to fuel contamination.
- [NTSB DEN03LA092](https://openairdocs.org/ntsb/DEN03LA092.md): Hiller UH-12E · Cheyenne, WY · Accident · No injuries · Limited investigation · Final report · May 30, 2003 · N508SQ · Substantial damage
  > the pilot's failure to maintain aircraft control. A contributing to the accident was the sudden tailwind encountered.
- [NTSB ATL03LA095](https://openairdocs.org/ntsb/ATL03LA095.md): Aerospatiale AS355F2 · Bainbridge, GA · Accident · No injuries · Limited investigation · Final report · May 17, 2003 · N42AT · Substantial damage
  > The pilot's improper flare during an attempted landing.
- [NTSB FTW03LA147](https://openairdocs.org/ntsb/FTW03LA147.md): Bell 206B · Hurst, TX · Accident · No injuries · Limited investigation · Final report · May 7, 2003 · N81519 · Substantial damage
  > The improper flare by the pilot receiving instruction, which resulted in the hard landing. A contributing factor was the flight instructor's inadequate supervision.
- [NTSB FTW03LA134](https://openairdocs.org/ntsb/FTW03LA134.md): Hughes 369HS · Conroe, TX · Accident · No injuries · Limited investigation · Final report · Apr 19, 2003 · N16Q · Substantial damage
  > The pilot's inability to control the helicopter after encountering loss of tail rotor effectiveness. A contributing factor was the unfavorable winds.
- [NTSB SEA03LA058](https://openairdocs.org/ntsb/SEA03LA058.md): Hughes 369D · Taholah, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 7, 2003 · N5225C · Substantial damage
  > The entanglement of the fuel quantity sender float in the start pump wiring within the fuel tank as a result of the wiring not being properly secured. This rendered the fuel gauge inaccurate and the low fuel warning light inoperative which led to fuel…
- [NTSB FTW03FA118](https://openairdocs.org/ntsb/FTW03FA118.md): Bell 407 · Broadus, TX · Accident · 2 fatal · Field investigation · Final report · Mar 27, 2003 · N175PA · Destroyed
  > The partial loss of engine power due to erratic fuel flow metering to the engine resulting from the single point failure of the PLA potentiometer in the hydro-mechanical fuel control unit. A contributing factor was the lack of suitable terrain to execute a…
- [NTSB CHI03FA060](https://openairdocs.org/ntsb/CHI03FA060.md): Agusta A109C · West Chicago, IL · Accident · 1 fatal · Field investigation · Final report · Jan 29, 2003 · N109MX · Destroyed
  > The pilot's failure to maintain control of the helicopter while maneuvering, resulting in the excessive descent rate and impact with terrain. Factors to the accident included the dark night, low ceiling and reduced visibility at the time of the accident.
- [NTSB FTW03LA080](https://openairdocs.org/ntsb/FTW03LA080.md): Bell 206B · Putnam, TX · Accident · Serious injuries · Limited investigation · Final report · Jan 9, 2003 · N115TV · Substantial damage
  > the pilot's failure to properly interpret and confirm a faulty tachometer instrument indication and his improper flare during the ensuing precautionary autorotation, which resulted in a hard landing. Also causal was the failure of the tachometer.
- [NTSB NYC03LA031](https://openairdocs.org/ntsb/NYC03LA031.md): Bell 206B · Odenton, MD · Accident · No injuries · Limited investigation · Final report · Dec 18, 2002 · N651GA · Substantial damage
  > The pilot's failure to monitor his fuel supply which resulted in a power loss due to fuel exhaustion, and the pilot's misjudged flare, which resulted in a hard landing.
- [NTSB LAX03LA017](https://openairdocs.org/ntsb/LAX03LA017.md): Hughes 369D · Kaaawa, Oahu, HI · Accident · Serious injuries · Limited investigation · Final report · Oct 29, 2002 · N220AL · Destroyed
  > Dynamic rollover during an attempted takeoff, due to the combined effects of the soft sloping terrain and the pilot's failure to redistribute the passengers to a more favorable lateral CG condition.
- [NTSB IAD02LA094](https://openairdocs.org/ntsb/IAD02LA094.md): Garlick OH-58AT · Rochester, MA · Accident · 1 fatal · Limited investigation · Final report · Sep 14, 2002 · N444JB · Substantial damage
  > The pilot's failure to center the sling load prior to commencing forward flight. Also causal, was the pilot's improper decision to attempt a takeoff with a quartering tailwind, which resulted in an engine compressor stall.
- [NTSB SEA02LA137](https://openairdocs.org/ntsb/SEA02LA137.md): Bell 206B · Elsie, OR · Accident · No injuries · Limited investigation · Final report · Jul 24, 2002 · N60PH · Substantial damage
  > The shattering and separation of the forward right (pilot's) windscreen for undetermined reason(s).
- [NTSB DEN02FA065](https://openairdocs.org/ntsb/DEN02FA065.md): Bell 206BIII · Raton, NM · Accident · 2 fatal · Field investigation · Final report · Jun 27, 2002 · N2779B · Destroyed
  > The pilot's failure to maintain clearance of the static wire. Factors were the static wire, and the glaring sunlight condition.
- [NTSB LAX02GA209](https://openairdocs.org/ntsb/LAX02GA209.md): McDonnell Douglas 369E · Ontario, CA · Accident · Serious injuries · Final report · Jun 25, 2002 · N40NT · Destroyed
  > The mechanic's improper maintenance procedures (FOD prevention) during a 100-hour inspection, which resulted in foreign object damage (FOD) to the compressor section and catastrophic engine failure. Factors were the presence of vehicles and power lines…
- [NTSB NYC02LA105](https://openairdocs.org/ntsb/NYC02LA105.md): Bell 206 · Columbus, OH · Accident · No injuries · Limited investigation · Final report · May 30, 2002 · N820H · Substantial damage
  > The flight instructor's delay in applying remedial action. A factor in the accident was the pilot allowing the rotor rpm to become too low during the deceleration and touchdown phase of the autorotation.
- [NTSB DEN02LA046](https://openairdocs.org/ntsb/DEN02LA046.md): Bell 206B-III · Moab, UT · Accident · No injuries · Limited investigation · Final report · May 24, 2002 · N191RH · Substantial damage
  > The pilot's failure to maintain rotor rpm during a forced landing. A contributing factor was fuel starvation.
- [NTSB FTW02LA143](https://openairdocs.org/ntsb/FTW02LA143.md): Bell 206B · Rosenberg, TX · Accident · Serious injuries · Limited investigation · Final report · May 12, 2002 · N717NH · Substantial damage
  > The pilot's failure to maintain terrain clearance.
- [NTSB FTW02LA117](https://openairdocs.org/ntsb/FTW02LA117.md): Bell 206B · Walnut Hill, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 11, 2002 · N513FD · Substantial damage
  > The loss of engine power as a result of the backing off of the PC air line "B" nut due to the improper installation by the company maintenance personnel. Contributing factors were the inadequate preflight by the pilot and the lack of suitable terrain for the…
- [NTSB DEN02LA036](https://openairdocs.org/ntsb/DEN02LA036.md): Bell 206B-III · Leadville, CO · Accident · No injuries · Limited investigation · Final report · Apr 4, 2002 · N997GM · Destroyed
  > the pilot's inadvertent flight into adverse weather, which resulted in a collision with terrain. A contributing factor was the downdraft.
- [NTSB FTW02LA102](https://openairdocs.org/ntsb/FTW02LA102.md): Bell 206L-3 · Oakley, UT · Accident · No injuries · Limited investigation · Final report · Mar 26, 2002 · N30YB · Substantial damage
  > The loss of engine power for an undetermined reason. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW02FA099](https://openairdocs.org/ntsb/FTW02FA099.md): Bell 206L-4 · Eugene Isld 188 · Accident · 1 fatal · Field investigation · Final report · Mar 23, 2002 · N7077B · Destroyed
  > The pilot's failure to maintain aircraft control during takeoff. A contributing factor was the pilot's inadequate preflight which resulted in his failure to remove the left front tie down.
- [NTSB SEA02FA030](https://openairdocs.org/ntsb/SEA02FA030.md): Agusta A109A II · Baring, WA · Accident · Serious injuries · Field investigation · Final report · Jan 20, 2002 · N55NW · Substantial damage
  > The sequential non-mechanical total loss of power in both engines 1 and 2 for undetermined reasons and the pilot's failure to maintain adequate rotor RPM to prevent a hard landing. Contributing factors were the tripped "RPM WARN" circuit breaker which…
- [NTSB DEN02GA016](https://openairdocs.org/ntsb/DEN02GA016.md): Hughes 369E · Park City, UT · Accident · 3 fatal · Final report · Dec 27, 2001 · N280SP · Destroyed
  > the pilot's inadequate visual lookout, resulting in an inflight collision with powerlines. Contributing factors were the fog and the powerlines.
- [NTSB ATL02TA021](https://openairdocs.org/ntsb/ATL02TA021.md): Bell 206 · Awendaw, SC · Accident · No injuries · Final report · Dec 21, 2001 · N206HE · Substantial damage
  > The pilot's failure to maintain clearance from the bambi bucket suspension assembly during dip operation.

Next page: https://openairdocs.org/ntsb.md?engine=03020&page=5

## 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=4

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