# 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 6 of 8 · 372 cases

## Cases, newest first

- [NTSB FTW97FA121](https://openairdocs.org/ntsb/FTW97FA121.md): MBB BO-105S · Lena, LA · Accident · 1 fatal · Field investigation · Final report · Mar 14, 1997 · N7161J · Destroyed
  > The pilot's continued VFR flight into instrument meteorological conditions, and his subsequent loss of aircraft control due to spatial disorientation. Factors were the pilot not following company procedures and directives, the low ceiling, and the dark night…
- [NTSB LAX97LA120](https://openairdocs.org/ntsb/LAX97LA120.md): McDonnell Douglas MD 369HS · Pacific Ocean (Pacific Ocean) · Accident · No injuries · Limited investigation · Final report · Mar 11, 1997 · N95MS · Destroyed
  > A loss of engine power due to a deteriorated compressor air seal, which resulted from inadequate maintenance inspection of the helicopter to detect corrosion in the compressor case while being operated in a marine environment.
- [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 NYC97LA041](https://openairdocs.org/ntsb/NYC97LA041.md): Bell 206A · Linden, NJ · Accident · No injuries · Limited investigation · Final report · Jan 3, 1997 · N555SJ · Substantial damage
  > the pilot allowing the rotor RPM to decay and his failure to take remedial action in time to recover the autorotation.
- [NTSB SEA97LA032](https://openairdocs.org/ntsb/SEA97LA032.md): Hughes 369D · Forks, WA · Accident · Serious injuries · Limited investigation · Final report · Nov 16, 1996 · N5225C · Substantial damage
  > fuel contamination, which resulted in loss of engine power. Factors relating to the accident included: improper servicing of the helicopter, and a lack of suitable terrain for an emergency landing due to the proximity of trees.
- [NTSB FTW97LA030](https://openairdocs.org/ntsb/FTW97LA030.md): Bell 206B-3 · Creole, LA · Accident · No injuries · Limited investigation · Final report · Oct 31, 1996 · N2043B · Substantial damage
  > the pilot's inadequate preflight by failing to remove the 100 foot long line and the external cargo basket from the helicopter before takeoff, and/or his failure to ensure that clearance/altitude was maintained from the fence.
- [NTSB CHI97LA008](https://openairdocs.org/ntsb/CHI97LA008.md): Hughes 369E · Hesston, KS · Accident · No injuries · Limited investigation · Final report · Oct 15, 1996 · N504AP · Substantial damage
  > the pilot selected unsuitable terrain for landing. The factors involved were: an inoperative landing light, dusk light conditions, and the terrain condition.
- [NTSB MIA96TA236](https://openairdocs.org/ntsb/MIA96TA236.md): Bell 206B III · Flamingo, FL · Accident · No injuries · Final report · Sep 30, 1996 · N2113Z · Substantial damage
  > the wire strike protection guide became entangled in a mangrove branch which resulted in helicopter control not being maintained.
- [NTSB SEA96LA165](https://openairdocs.org/ntsb/SEA96LA165.md): Bell 206B · Warren, ID · Accident · 1 fatal · Limited investigation · Final report · Jul 24, 1996 · N750LT · Destroyed
  > the pilot's improper remedial action after helicopter's right skid became snagged by a log that was used in the construction of a temporary landing site. Factors relating to the accident were: the pilot's selection of an unsuitable landing area, inadequate…
- [NTSB ANC96TA092](https://openairdocs.org/ntsb/ANC96TA092.md): Hughes 369D · Ketchikan, AK · Accident · No injuries · Final report · Jun 26, 1996 · N5125Q · Substantial damage
  > The pilot's failure to maintain control of the helicopter. The pilot's selection of unsuitable terrain for landing was a factor in the accident.
- [NTSB FTW96LA274](https://openairdocs.org/ntsb/FTW96LA274.md): Hughes 369HE · Las Cruces, NM · Accident · No injuries · Limited investigation · Final report · Jun 24, 1996 · N521TC · Substantial damage
  > the pilot's failure to maintain clearance between the tail rotor and a fence while hovering.
- [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 LAX96LA104](https://openairdocs.org/ntsb/LAX96LA104.md): Bell 206BIII · Kamuela, HI · Accident · No injuries · Limited investigation · Final report · Feb 1, 1996 · N90194 · Substantial damage
  > failure of the nose case (No.1) bearing resulting in oil starvation.
- [NTSB MIA96WA070](https://openairdocs.org/ntsb/MIA96WA070.md): Bell 206 · Exuma, Bahamas · Accident · Minor injuries · Foreign investigation · Jan 20, 1996 · N87JH · Substantial damage
- [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 LAX95FA339](https://openairdocs.org/ntsb/LAX95FA339.md): Bell 206L-1 · Irvine, CA · Accident · 1 fatal · Field investigation · Final report · Sep 20, 1995 · N700TH · Destroyed
  > the pilot's intentional VFR flight into IMC conditions and failure to maintain an adequate terrain clearance altitude, and the local controller's improper use of ATC procedure/technique. Factors in the accident were the helicopter's low fuel state and lack of…
- [NTSB FTW95IA397](https://openairdocs.org/ntsb/FTW95IA397.md): MBB BO-105C · Lafayette, LA · Incident · No injuries · Incident investigation · Final report · Sep 18, 1995 · N91070 · No damage
  > a short in the 'jam proof system' solenoid valve which prevented activation of the backup hydraulic system and resulting in a cyclic hardover. Factors were the contaminated hydraulic fluid and the resulting jammed actuator (longitudinal control slider).
- [NTSB NYC95LA198](https://openairdocs.org/ntsb/NYC95LA198.md): Bell 206B · Bingham, ME · Accident · Minor injuries · Limited investigation · Final report · Aug 18, 1995 · N16915 · Destroyed
  > the pilot's inadequate landing flare resulting in a hard landing and roll over, and a subsequent collision with trees.
- [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 SEA95LA139](https://openairdocs.org/ntsb/SEA95LA139.md): Hughes 369HS · Orting, WA · Accident · Serious injuries · Limited investigation · Final report · Jul 4, 1995 · N9196F · Substantial damage
  > The pilot's failure to see and avoid the cable.
- [NTSB FTW95TA228](https://openairdocs.org/ntsb/FTW95TA228.md): Bell 206B-III · Meeker, CO · Accident · No injuries · Final report · Jun 2, 1995 · N85RP · Substantial damage
  > Failure by the pilot to maintain control of the aircraft during landing. A factor was soft terrain.
- [NTSB SEA95GA062](https://openairdocs.org/ntsb/SEA95GA062.md): Bell 206 · Dillon, MT · Accident · No injuries · Final report · Feb 24, 1995 · N2277T · Substantial damage
  > The pilot's selection of a landing site that was not suitable to support the weight of the helicopter. Factors include terrain covered with soft snow.
- [NTSB MIA95LA078](https://openairdocs.org/ntsb/MIA95LA078.md): Hughes 500C · Key Largo, FL · Accident · No injuries · Limited investigation · Final report · Feb 20, 1995 · N7172Z · Substantial damage
  > The pilot's misjudgment of altitude and failure to apply collective cushioning pitch during an autorotation resulting in a hard landing. Contributing to the accident was a total loss of engine power due to a loose coupling B-nut on the pneumatic fuel control…
- [NTSB FTW95LA099](https://openairdocs.org/ntsb/FTW95LA099.md): MBB BO-105S · Cameron 278b · Accident · No injuries · Limited investigation · Final report · Jan 23, 1995 · N51948 · Substantial damage
  > The pilot's failure to remove the tiedoown during the preflight and an inadequate preflight.
- [NTSB ANC95LA014](https://openairdocs.org/ntsb/ANC95LA014.md): Bell 206B · Kenai, AK · Accident · No injuries · Limited investigation · Final report · Dec 4, 1994 · N3179X · Substantial damage
  > The pilot's failure to follow the information in the flight manual concerning the use of the particle separator kit and deflector kit when operating in falling snow. Factors were the rough terrain in the forced landing area and no installation of the…
- [NTSB SEA95LA013](https://openairdocs.org/ntsb/SEA95LA013.md): Hiller UH-12E4 · Morton, WA · Accident · No injuries · Limited investigation · Final report · Oct 28, 1994 · N80NW · Substantial damage
  > A leak in the fuel filler cap and water in the fuel system. A factor to the accident was: inadequate preflight.
- [NTSB NYC95LA009](https://openairdocs.org/ntsb/NYC95LA009.md): Aerospatiale AS-355 · Jonesville, VA · Accident · 1 fatal · Limited investigation · Final report · Oct 15, 1994 · N5787A · Destroyed
  > The pilot's failure to maintain clearance from the power lines.
- [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 FTW94T#A01](https://openairdocs.org/ntsb/FTW94T%23A01.md): Bell 206A · Estes Park, CO · Accident · No injuries · Class 3 · Final report · Jun 26, 1994 · N7881S · Substantial damage
- [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 MIA94LA144](https://openairdocs.org/ntsb/MIA94LA144.md): Bell 206B · St. Petersburg, FL · Accident · Minor injuries · Limited investigation · Final report · May 19, 1994 · N72Z · Substantial damage
  > The failure of the number five bearing, shaft, or thomas coupling for undetermined reasons. Contributing to the accident was the pilot-in-command's delayed response in conducting the emergency procedure by not reducing the throttle to idle position, and…
- [NTSB SEA94LA109](https://openairdocs.org/ntsb/SEA94LA109.md): Bell 206B · Summerville, OR · Accident · Minor injuries · Limited investigation · Final report · Apr 25, 1994 · N35BL · Destroyed
  > The pilot did not maintain clearance from the wires. The overcast sky condiiton was a factor.
- [NTSB MIA94LA116](https://openairdocs.org/ntsb/MIA94LA116.md): Bell 206B · Mayaguez, PR · Accident · Serious injuries · Limited investigation · Final report · Apr 10, 1994 · N39125 · Substantial damage
  > Loss of engine power for undetermined reasons which resulted in a descent and ditching.
- [NTSB SEA94LA094](https://openairdocs.org/ntsb/SEA94LA094.md): Hughes 369D · Rimrock, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 1, 1994 · N5211R · Substantial damage
  > Fuel exhaustion, the pilot in command's failure to refuel the aircraft, and the inability to successfully execute an auto- rotation landing because of the low altitude.
- [NTSB FTW94LA110](https://openairdocs.org/ntsb/FTW94LA110.md): Bell 206B · Belen, NM · Accident · No injuries · Limited investigation · Final report · Mar 27, 1994 · N2779B · Substantial damage
  > The hard landing due to a delayed flare and improper touchdown. A factor was the loss of engine power.
- [NTSB MIA94WA094](https://openairdocs.org/ntsb/MIA94WA094.md): Bell 206BIII · Corozal, Honduras · Accident · Serious injuries · Foreign investigation · Mar 10, 1994 · N5239Y · Substantial damage
- [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 LAX94LA041](https://openairdocs.org/ntsb/LAX94LA041.md): Hughes 369D · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Nov 7, 1993 · N5172K · Destroyed
  > An undetermined event that resulted in the accident.
- [NTSB FTW93GA269](https://openairdocs.org/ntsb/FTW93GA269.md): Bell 206B · Wht Sands Mr, NM · Accident · No injuries · Final report · Sep 29, 1993 · N39049 · Substantial damage
  > The pilot's failure to land an adequate distance away from the unsecured parachute.
- [NTSB LAX93LA375](https://openairdocs.org/ntsb/LAX93LA375.md): Bell 206B · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Sep 22, 1993 · N285CA · Destroyed
  > a loss of engine power for undetermined reasons.
- [NTSB LAX93LA319](https://openairdocs.org/ntsb/LAX93LA319.md): Hiller UH-12E · Dixon, CA · Accident · Serious injuries · Limited investigation · Final report · Aug 11, 1993 · N100LM · Destroyed
  > the failure of the pilot to visually detect and avoid the guy wire.
- [NTSB LAX93LA249](https://openairdocs.org/ntsb/LAX93LA249.md): Hughes 369D · Kahului, HI · Accident · No injuries · Limited investigation · Final report · Jun 11, 1993 · N1113L · Substantial damage
  > The failure of the pilot to maintain adequate ground obstruction clearance while engaged in a cattle herding operation.
- [NTSB FTW93TA#03](https://openairdocs.org/ntsb/FTW93TA%2303.md): Bell 206B · Dallas, TX · Accident · No injuries · Final report · Mar 16, 1993 · N3211N · Substantial damage
- [NTSB LAX93LA132](https://openairdocs.org/ntsb/LAX93LA132.md): Hughes 369D · Kahului, HI · Accident · Serious injuries · Limited investigation · Final report · Feb 22, 1993 · N58240 · Substantial damage
  > The pilots failure to maintain an adequate visual lookout for obstructions while performing a low altitude surveillance operation in a mountainous area, and, his failure to select an altitude sufficient to ensure clearance from all potential obstacles.
- [NTSB LAX93LA044](https://openairdocs.org/ntsb/LAX93LA044.md): Hughes 369D · Carlsbad, CA · Accident · No injuries · Limited investigation · Final report · Nov 16, 1992 · N220AL · Substantial damage
  > Failure of the overrunning clutch assembly bearing for undetermined reasons.
- [NTSB NYC92WA186](https://openairdocs.org/ntsb/NYC92WA186.md): Mcdonnell Douglas 500E · Niagara Falls, Canada · Accident · 4 fatal · Foreign investigation · Sep 29, 1992 · N588DB · 2 aircraft · Destroyed
- [NTSB NYC92T#A01](https://openairdocs.org/ntsb/NYC92T%23A01.md): MBB BO-105CBS · Brooklyn, NY · Accident · No injuries · Class 3 · Final report · Jul 27, 1992 · N729RJ · Substantial damage
- [NTSB LAX92T#A05](https://openairdocs.org/ntsb/LAX92T%23A05.md): McDonnell Douglas 369E · San Diego, CA · Accident · No injuries · Class 3 · Final report · May 12, 1992 · N16069 · Substantial damage
- [NTSB SEA92LA088](https://openairdocs.org/ntsb/SEA92LA088.md): Hughes 369E · Hillsboro, OR · Accident · No injuries · Limited investigation · Final report · May 1, 1992 · N5211Y · Substantial damage
  > The pilot in command's excessive application of collective.
- [NTSB FTW92GA080](https://openairdocs.org/ntsb/FTW92GA080.md): Bell 206B III · Falfurrias, TX · Accident · No injuries · Final report · Mar 3, 1992 · N3201R · Substantial damage
  > The pilot's failure to maintain directional control due to his ability to maintain an adequate visual lookout being restricted. Factors were the observer's delay in informing the pilot of the rearward drift and the dark night conditions.

Next page: https://openairdocs.org/ntsb.md?engine=03020&page=7

## 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=6

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