# NTSB investigations: Pratt & Whitney R-1830 series, AK

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 ANC26LA040](https://openairdocs.org/ntsb/ANC26LA040.md): Douglas DC3C · Anchorage, AK · Accident · No injuries · Class 4 · Limited · Investigation open · May 8, 2026 · N115U · Substantial damage
- [NTSB ANC01FA033](https://openairdocs.org/ntsb/ANC01FA033.md): Douglas DC-3 · Unalaska, AK · Accident · 2 fatal · Field investigation · Final report · Jan 24, 2001 · N19454 · Destroyed
  > The airplane flightcrew's failure to maintain adequate distance/altitude from mountainous terrain during a departure climb to cruise flight, and the captain's impairment from drugs. Factors in the accident were dark night conditions, and the first officer's…
- [NTSB ANC98LA114](https://openairdocs.org/ntsb/ANC98LA114.md): Douglas DC-3C · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Jul 31, 1998 · N305SF · Substantial damage
  > The pilot's failure to maintain directional control during landing, and the resulting overload fracture of the tailwheel fork assembly.
- [NTSB ANC98LA055](https://openairdocs.org/ntsb/ANC98LA055.md): Douglas DC-3C · Anchorage, AK · Accident · Minor injuries · Limited investigation · Final report · May 24, 1998 · N67588 · Substantial damage
  > The pilot's inadequate in-flight planning/decision which resulted in fuel exhaustion and subsequent loss of engine power. A related factor was the soft, marshy terrain at the forced landing area.
- [NTSB SEA89FA122](https://openairdocs.org/ntsb/SEA89FA122.md): Douglas DC-3C · Petersburg, AK · Accident · No injuries · Field investigation · Final report · Jun 26, 1989 · N8042X · Substantial damage
  > The pilot's improper decision to ditch the aircraft when it could have been flown back to the airport using the right seat controls. Contributing factor(s) was: the failure & separation of a portion of the right aileron fabric, and the pilot's excessive force…
- [NTSB ANC85FA112](https://openairdocs.org/ntsb/ANC85FA112.md): Douglas DC-3 · King Salmon, AK · Accident · No injuries · Field investigation · Final report · Jun 30, 1985 · N168Z · Substantial damage
  > During an instrument apch, the acft's right eng lost power. The plt moved the right fuel selector to the left main tank & began emergency procedures. Shortly after that, the acft broke out of the overcast & the aircrew saw the arpt. However, the left eng also…
- [NTSB ANC81FA074](https://openairdocs.org/ntsb/ANC81FA074.md): Douglas DC-3 · Pilot Point, AK · Accident · 3 fatal · Closed · Jul 1, 1981 · N111ST · Destroyed
- [NTSB ANC70AA080](https://openairdocs.org/ntsb/ANC70AA080.md): Douglas DC-3C · Barrow, AK · Accident · Minor injuries · Closed · May 21, 1970 · N75430 · Substantial damage
- [NTSB ANC66A0010](https://openairdocs.org/ntsb/ANC66A0010.md): Douglas DC-3 · Mc Carthy, AK · Accident · No injuries · Closed · Sep 14, 1965 · N91314 · 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" = 'AK' 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 ('52020'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=52020&state=AK

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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.