# NTSB investigations: Allison 250-C20 series: Loss of control - in flight

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.

## Latest cases

- [NTSB DFW07LA109](https://openairdocs.org/ntsb/DFW07LA109.md): Bell 206B · E. Cameron 219 · Accident · Minor injuries · Limited investigation · Final report · May 11, 2007 · N3RL · Substantial damage
  > The pilot's failure to establish a climb and maintian directional control of the helicopter while departing the offshore platform.
- [NTSB NYC06TA190](https://openairdocs.org/ntsb/NYC06TA190.md): MD Helicopter 500N · Louisville, KY · Accident · Minor injuries · Final report · Aug 2, 2006 · N520AP · Substantial damage
  > The pilot's failure to maintain control of the helicopter and the flight instructor's inadequate supervision, which resulted in a hard landing and subsequent rollover.
- [NTSB SEA05MA202](https://openairdocs.org/ntsb/SEA05MA202.md): Agusta A109A II · Edmonds, WA · Accident · 3 fatal · Major investigation · Final report · Sep 30, 2005 · N655GS · Destroyed
  > Loss of control for an undetermined reason during maneuvering flight, which resulted in an in-flight collision with water.
- [NTSB CHI05CA271](https://openairdocs.org/ntsb/CHI05CA271.md): Bell 206B · Elk Point, SD · Accident · No injuries · Data collection · Final report · Sep 15, 2005 · N2995W · Substantial damage
  > The loss of directional control for undetermined reasons which led to the pilot not being able to maintain clearance from the embankment during the forced landing. The rising embankment was a factor.
- [NTSB DFW05LA239](https://openairdocs.org/ntsb/DFW05LA239.md): Bell 206B · New Orleans, LA · Accident · Minor injuries · Limited investigation · Final report · Sep 7, 2005 · N230CA · Substantial damage
  > The pilot's failure to maintain directional control after encountering a loss of tail rotor effectiveness. A contributing factor was the lack of suitable terrain.
- [NTSB LAX05LA289](https://openairdocs.org/ntsb/LAX05LA289.md): Bell 206B · Long Beach, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 5, 2005 · N667JM · Substantial damage
  > the pilot's decision not to release the banner when it became entangled on itself, which resulted in the banner tow rope becoming ensnarled with the tail rotor system.
- [NTSB DFW05LA252](https://openairdocs.org/ntsb/DFW05LA252.md): Bell 206B · Myrtle Grove, LA · Accident · Minor injuries · Limited investigation · Final report · Sep 1, 2005 · N59539 · Substantial damage
  > The pilot's loss of control in flight for undetermined reasons.
- [NTSB DFW05FA086](https://openairdocs.org/ntsb/DFW05FA086.md): Bell 206B-3 · Shelbyville, TX · Accident · 3 fatal · Field investigation · Final report · Mar 10, 2005 · N85BH · Substantial damage
  > The pilot's failure to maintain altitude and clearance for undetermined reasons.
- [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 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 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 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 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 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 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 MIA01TA194](https://openairdocs.org/ntsb/MIA01TA194.md): Bell 206B-III · Jacksonville, FL · Accident · Minor injuries · Final report · Jul 25, 2001 · N313JP · Destroyed
  > the pilot's failure to recognize and correct for unanticipated right yaw/loss of tail rotor effectiveness (LTE) during an approach to hover at a low altitude, which resulted in a loss of control and the helicopter descending and colliding with a house and the…
- [NTSB CHI00LA121](https://openairdocs.org/ntsb/CHI00LA121.md): Hughes 500C · Salina, KS · Accident · No injuries · Limited investigation · Final report · Apr 24, 2000 · N9177F · Substantial damage
  > the loss of tail rotor effectiveness and the autorotation performed by the pilot. The unfavorable wind was a contributing factor.
- [NTSB FTW00FA091](https://openairdocs.org/ntsb/FTW00FA091.md): Eurocopter BO105S-CBS-5 · Dalhart, TX · Accident · 4 fatal · Field investigation · Final report · Mar 10, 2000 · N335T · Destroyed
  > The pilot's failure to maintain control of the helicopter as a result of his continued flight into known adverse weather conditions. Factors were the dark night light condition, fog, low ceiling, and the pilot's lack of total instrument flight time.
- [NTSB LAX00LA109](https://openairdocs.org/ntsb/LAX00LA109.md): Hughes 500C · Pohnpei (Pacific Ocean) · Accident · Minor injuries · Limited investigation · Final report · Feb 18, 2000 · N437DS · Destroyed
  > The pilot reported that he and the observer were planning to conduct tuna spotting operations. This was to be the first flight of the day. After takeoff, about 100 to 150 feet above sea level, the helicopter began an uncommanded right turn, followed by an…
- [NTSB IAD00LA015](https://openairdocs.org/ntsb/IAD00LA015.md): Bell 206A · Brutus, NY · Accident · No injuries · Limited investigation · Final report · Jan 5, 2000 · N206GR · Substantial damage
  > Was the pilot's failure to maintain directional control after encountering a loss of tail rotor effectiveness.
- [NTSB LAX98LA200](https://openairdocs.org/ntsb/LAX98LA200.md): Hughes 369HS · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Jun 16, 1998 · N95MS · Destroyed
  > The improper shimmying of the tail rotor driveshaft by maintenance personnel which induced fatigue in the tail rotor driveshaft coupling causing it to fail, which resulted in a loss of tail rotor control. A factor is the failure of the pilot to recognize the…
- [NTSB FTW97LA252](https://openairdocs.org/ntsb/FTW97LA252.md): Bell 206B · New Iberia, LA · Accident · Serious injuries · Limited investigation · Final report · Jul 3, 1997 · N49661 · Substantial damage
  > the pilot's improper in-flight planning/decision. A related factor was his failure to follow the company procedure of maintaining visual contact with the external long-line cable, while hovering with it attached.
- [NTSB LAX97GA105](https://openairdocs.org/ntsb/LAX97GA105.md): McDonnell Douglas 369D · Santee, CA · Accident · 1 fatal · Final report · Feb 17, 1997 · N5200Y · Substantial damage
  > Spatial disorientation and temporary visual impairment that led to a loss of aircraft control as result of difficulty to light adaptivity. Contributing was the crew coordination and inadequate night flight recurrency training.
- [NTSB FTW96LA147](https://openairdocs.org/ntsb/FTW96LA147.md): Bell 206BIII · Houma, LA · Accident · Minor injuries · Limited investigation · Final report · Mar 12, 1996 · N115FH · Substantial damage
  > the pilot's attempted maneuver which exceeded the dynamic capability of the helicopter.
- [NTSB FTW96FA028](https://openairdocs.org/ntsb/FTW96FA028.md): Mbb BO-105S · League City, TX · Accident · 2 fatal · Field investigation · Final report · Oct 26, 1995 · N105AG · Destroyed
  > the pilot's failure to maintain aircraft control. Factors were the pilot's lack of total experience in the MBB BO-105 helicopter and the dark night light conditions.
- [NTSB ANC95LA115](https://openairdocs.org/ntsb/ANC95LA115.md): Bell 206B · Talkeetna, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 26, 1995 · N85CA · Substantial damage
  > The inadvertent restriction of the anti-torque pedal by the pilot's foot, while the pilot (an incomplete paraplegic) was attempting to land.
- [NTSB LAX94LA352](https://openairdocs.org/ntsb/LAX94LA352.md): Hughes 369E · Volcano, HI · Accident · Minor injuries · Limited investigation · Final report · Sep 4, 1994 · N279F · Substantial damage
  > the pilot's failure to maintain adequate main rotor rpm and the resultant inadvertent skid contact with the ground.
- [NTSB LAX94LA241](https://openairdocs.org/ntsb/LAX94LA241.md): Hughes 369D · Kaneohe, HI · Accident · No injuries · Limited investigation · Final report · Jun 7, 1994 · N4943T · Substantial damage
  > the operator's and pilot's failure to ensure that the cargo net containing empty paper bags was sufficiently ballasted to prevent it from flying up into the tail rotor.
- [NTSB FTW94LA061](https://openairdocs.org/ntsb/FTW94LA061.md): Hughes 369HS · Mason, TX · Accident · Serious injuries · Limited investigation · Final report · Jan 1, 1994 · N7092Q · Destroyed
  > Loss of aircraft control for an undetermined reason.
- [NTSB SEA92FA016](https://openairdocs.org/ntsb/SEA92FA016.md): Bell 206B · Salt Lake City, UT · Accident · 1 fatal · Field investigation · Final report · Nov 8, 1991 · N5736B · Destroyed
  > The pilot failed to maintain directional control. Factors to the accident were: inadeqaute remedial action, over confidence in personal ability, and lack of recent expereince.
- [NTSB SEA91FA184](https://openairdocs.org/ntsb/SEA91FA184.md): Bell 206B · Toutle, WA · Accident · 1 fatal · Field investigation · Final report · Jul 22, 1991 · N276KA · Substantial damage
  > Failure of the pilot to maintain airspeed and correct for the right yawing condition. Factors to the accident were: inadequate compensation for wind conditions, diverted attention, and lack of total expereince in type of aircraft.
- [NTSB LAX90FA060](https://openairdocs.org/ntsb/LAX90FA060.md): McDonnell Douglas 369E · Santa Rosa, CA · Accident · 1 fatal · Field investigation · Final report · Dec 29, 1989 · N1604L · Destroyed
  > The pilot's improper preflight planning/decision which resulted in the loss of tail rotor effectiveness. Contributing to the accident was the pilot allowing the maximum gross weight of the aircraft to be exceeded, and the tailwind.
- [NTSB LAX89FA136](https://openairdocs.org/ntsb/LAX89FA136.md): Aerospatiale AS-355-F · Bear Valley, CA · Accident · No injuries · Field investigation · Final report · Mar 26, 1989 · N84MH · Substantial damage
  > Improper in-flight planning/decision by the pilot, which resulted in a loss of aircraft control during a slow speed, downwind approach to a high altitude stolport. Contributing factors were: high density altitude, tailwind, improper weather evaluation by the…
- [NTSB DEN89LA090](https://openairdocs.org/ntsb/DEN89LA090.md): Bell 222 · Leadville, CO · Accident · No injuries · Limited investigation · Final report · Mar 23, 1989 · N5008Q · Substantial damage
  > Failure of the pilot to compensate adequately for wind conditions with rudder pedals while maneuvering in unfavorable wind and high density altitude.
- [NTSB LAX88LA179](https://openairdocs.org/ntsb/LAX88LA179.md): McDonnell Douglas 369D · Waialua, HI · Accident · Serious injuries · Limited investigation · Final report · May 13, 1988 · N4943T · Destroyed
  > Failure to follow procedures established by the manufacture for uncommanded trim inputs and his decision to make a hover approach to landing.
- [NTSB LAX86MA311](https://openairdocs.org/ntsb/LAX86MA311.md): Bell 206B · Alamo, CA · Accident · 2 fatal · Major investigation · Final report · Aug 3, 1986 · N49606 · Destroyed
  > Witnesses reported seeing the helicopter circle twice over a residence at an alt of aprx 50' AGL. Upon initiating the third turn the helicopter entered an abrupt 90 deg bank and nosed down to impact with the terrain. Exam of the helicopter failed to reveal…
- [NTSB LAX85LA403](https://openairdocs.org/ntsb/LAX85LA403.md): Hughes 369D · Porterville, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 25, 1985 · N29707 · Destroyed
  > After climbing to a cruise alt of 13500 ft MSL to cross the sierra Nevada mountains, south of mt whitney, the plt entered cruise flt at an indicated airspeed of aprx 120 to 130 KTS. The plt's flt manual lists 110 KTS as the velocity velocity to never exceed…
- [NTSB LAX85FA199](https://openairdocs.org/ntsb/LAX85FA199.md): Hiller UH12J3 · Klamath, CA · Accident · Serious injuries · Field investigation · Final report · Apr 12, 1985 · N545HA · Destroyed
  > The helicopter was returning to a private landing pad after a reconaisance flight prior to sprating. At about 10FT AGL after flaring and leveling the pilot could not control a drift and roll to the left. The rotor blades struck the ground within about one…
- [NTSB SEA85LA020](https://openairdocs.org/ntsb/SEA85LA020.md): Hughes 369D · Kings Valley, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 16, 1984 · N58256 · Destroyed
  > The plt attempted to fly the acft away from the site of a proposed load drop before the drop was completed. The FAA inspectors said the sling did not release properly. When the plt attempted to depart the area the acft struck the groundin a nose low attitude.…

## 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')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 250))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03020&occurrence=250

---
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.