# NTSB investigations: Allison 250 SER 250HP, WA

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 WPR25LA134](https://openairdocs.org/ntsb/WPR25LA134.md): Bell 206B · Amboy, WA · Accident · No injuries · Class 3 · Limited · Preliminary report · Apr 15, 2025 · N16671 · Substantial damage
  > On April 14, 2025, about 1800 Pacific daylight time, a Bell 206B, N16671, was substantially damaged when it was involved in an accident near Amboy, Washington. The pilot was not injured. The helicopter was operated as a Title 14 Code of Federal Regulations,…
- [NTSB WPR21LA084](https://openairdocs.org/ntsb/WPR21LA084.md): Hughes 369D · Winthrop, WA · Accident · No injuries · Class 4 · Limited · Final report · Jan 9, 2021 · N8612F · Substantial damage
  > The pilot’s failure to adequately monitor the environment which resulted in a collision with a snowbank and subsequent loss of control.
- [NTSB WPR14FA310](https://openairdocs.org/ntsb/WPR14FA310.md): Bell 206A · Wenatchee, WA · Accident · 1 fatal · Field investigation · Final report · Jul 23, 2014 · N949FM · Substantial damage
  > The pilot's failure to maintain a proper decent rate and path, which resulted in a hard landing and dynamic rollover. Contributing to the accident was the pilot's impairment by a sedating medication.
- [NTSB WPR12CA236](https://openairdocs.org/ntsb/WPR12CA236.md): Bell 206B · Burbank, WA · Accident · No injuries · Data collection · Final report · May 30, 2012 · N106TV · Substantial damage
  > The failure of maintenance personnel to properly torque an air tube fitting, which resulted in a total loss of engine power.
- [NTSB SEA04LA102](https://openairdocs.org/ntsb/SEA04LA102.md): Bell 206B · Prosser, WA · Accident · No injuries · Limited investigation · Final report · Jun 9, 2004 · N213SD · Substantial damage
  > The pilot's failure to maintain clearance with the power lines while maneuvering.
- [NTSB SEA99LA092](https://openairdocs.org/ntsb/SEA99LA092.md): Hughes 369D · Shelton, WA · Accident · No injuries · Limited investigation · Final report · Jun 22, 1999 · N1089Y · Substantial damage
  > The pilot's failure to maintain rotor RPM during an autorotation.
- [NTSB SEA99FA018](https://openairdocs.org/ntsb/SEA99FA018.md): Hughes 369D · Taholah, WA · Accident · Minor injuries · Field investigation · Final report · Dec 8, 1998 · N1096L · Substantial damage
  > Turbine wheel failure as the result of a low-cycle fatigue crack that initiated in a beyond-limits grinding gouge. Factors include improper maintenance by unknown parties and tree stumps that prohibited a successful emergency landing.
- [NTSB SEA98LA160](https://openairdocs.org/ntsb/SEA98LA160.md): McDonnell Douglas 369D · Oso, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 10, 1998 · N1096L · Substantial damage
  > The separation of the 90 degree gearbox and tail rotor assembly for undetermined reasons followed by the inability of the pilot-in-command to maintain control of the rotorcraft.
- [NTSB SEA90TL#01](https://openairdocs.org/ntsb/SEA90TL%2301.md): Bell 206 · Cougar, WA · Accident · No injuries · Class 3 · Final report · Mar 12, 1990 · N678KG · Substantial damage
- [NTSB SEA87LA025](https://openairdocs.org/ntsb/SEA87LA025.md): Hughes 369D · Winlock, WA · Accident · No injuries · Limited investigation · Final report · Nov 14, 1986 · N1089D · Substantial damage
  > The plt was loading xmas trees from a farm to a truck. He had just released a load and was en route back to the pickup area when the empty long-line sling contacted treetops. The sling rebounded into the tail rotor & damaged the gear box which resulted in…
- [NTSB SEA85LA017](https://openairdocs.org/ntsb/SEA85LA017.md): Hughes 369D · Humptulips, WA · Accident · Minor injuries · Limited investigation · Final report · Nov 13, 1984 · N1096L · Destroyed
  > When the hoisting cable on the helicopter failed, the hook end rebounded into the rotor system. The rotor system failed from the structural damage imposed and the acft went into an uncontroled descent impacting the ground on the left skid.
- [NTSB SEA84LA083](https://openairdocs.org/ntsb/SEA84LA083.md): Hughes 369D · Kent, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 1984 · N1092L · Substantial damage
  > The plt requested clearance to transit the seattle tca for a landing at Boeing field. He was advised of a DC-10 departing the seattle-tacoma intl arpt & was cautioned about possible wake turbulence. The DC-10 passed the helicopter with about 1 1/2 mi lateral…
- [NTSB SEA83LA205](https://openairdocs.org/ntsb/SEA83LA205.md): Hughes 369B · Cougar, WA · Accident · Minor injuries · Limited investigation · Final report · Sep 26, 1983 · N10966 · Destroyed
  > The aircraft collided with trees and terrain during a forced landing attempt following an in-flight power loss. Subsequent engine teardown revealed failure of several components.
- [NTSB SEA82DA137](https://openairdocs.org/ntsb/SEA82DA137.md): Hughes 369D · Shelton, WA · Accident · No injuries · Final report · Aug 7, 1982 · N10966 · Substantial damage
  > During a sight seeing flight the pilot smelled a burning odor and prepared to make a precautionary off-airport landing. Shortly thereafter, engine RPM decayed and an autorotative landing was effected on a dirt road. On touchdown, the main rotor blades flexed…
- [NTSB SEA81DYP37](https://openairdocs.org/ntsb/SEA81DYP37.md): Hughes 369D · Leavenworth, WA · Accident · No injuries · Closed · Aug 26, 1981 · N58306 · Substantial damage
- [NTSB SEA76DYE07](https://openairdocs.org/ntsb/SEA76DYE07-149983.md): Hiller Acft FH1100 · Shelton, WA · Accident · No injuries · Closed · Aug 8, 1975 · N5060F · Substantial damage
- [NTSB SEA74FYG13](https://openairdocs.org/ntsb/SEA74FYG13.md): Hughes 369HS · Packwood, WA · Accident · Serious injuries · Closed · Aug 26, 1973 · N9043F · Destroyed
- [NTSB SEA73FYE05](https://openairdocs.org/ntsb/SEA73FYE05.md): Hiller Acft FH1100 · Skykomish, WA · Accident · No injuries · Closed · Jul 21, 1972 · N5044F · Substantial damage
- [NTSB SEA73AS001](https://openairdocs.org/ntsb/SEA73AS001.md): Hiller Acft FH1100 · North Bend, WA · Accident · No injuries · Closed · Jul 19, 1972 · N590FH · Substantial damage
- [NTSB SEA72AS053](https://openairdocs.org/ntsb/SEA72AS053.md): Hiller Acft FH1100 · Tacoma, WA · Accident · 1 fatal · Closed · Jun 8, 1972 · N5044F · Substantial damage

## 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."eventStateOrRegion" = 'WA' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('03002', '03003'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03002&state=WA

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