# NTSB investigations: Allison 250 SER 250HP, 1998

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 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 FTW99LA026](https://openairdocs.org/ntsb/FTW99LA026.md): Bell 206B · Matagorda 713 · Accident · No injuries · Limited investigation · Final report · Nov 15, 1998 · N21466 · Substantial damage
  > The pilot's loss of control due to his failure to untie ground straps. A factor was his inadequate preflight inspection.
- [NTSB ANC98TA162](https://openairdocs.org/ntsb/ANC98TA162.md): Hughes 369D · Homer, AK · Accident · Serious injuries · Final report · Sep 27, 1998 · N1091P · Minor damage
  > The passenger not following the instructions given by the pilot. Contributing factors were the rising terrain and the pilot's diverted attention during the toe in 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 FTW98LA260](https://openairdocs.org/ntsb/FTW98LA260.md): Bell 206B · Corpus Christi, TX · Accident · No injuries · Limited investigation · Final report · Jun 7, 1998 · N16814 · Substantial damage
  > The failure of the tail rotor drive shaft due to the separation of a bolt at one of the drive shaft disc couplings for an undetermined reason, which resulted in the pilot's inability to maintain directional control during landing.
- [NTSB MIA98LA148](https://openairdocs.org/ntsb/MIA98LA148.md): Bell 206L-1 · Orlando, FL · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N60WJ · Substantial damage
  > failure of the flight crew to maintain main rotor RPM during a landing touchdown, which resulted in the main rotor blades contacting the tailboom.

## 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 year(c."eventDate") = 1998
  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&year=1998

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