# NTSB investigations: Dehavilland DHC-6 TWIN OTTER, 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 ANC05LA025](https://openairdocs.org/ntsb/ANC05LA025.md): de Havilland DHC-6-200 · Toksook Bay, AK · Accident · No injuries · Limited investigation · Final report · Jan 27, 2005 · N201EH · Substantial damage
  > The pilot's inadequate compensation for the gusty crosswind wind condition, which resulted in a loss of control during the landing roll, and the collapse of the nose landing gear. Factors associated with the accident were the crosswind and wind gusts.
- [NTSB ANC02LA079](https://openairdocs.org/ntsb/ANC02LA079.md): de Havilland DHC-6 · Toksook Bay, AK · Accident · No injuries · Limited investigation · Final report · Jul 13, 2002 · N885EA · Substantial damage
  > A bird strike during takeoff, which resulted in damage to the right wing.
- [NTSB ANC89LA168](https://openairdocs.org/ntsb/ANC89LA168.md): de Havilland DHC-6 · Sleepy Bay, AK · Accident · No injuries · Limited investigation · Final report · Sep 19, 1989 · N851TB · Substantial damage
  > Selection of unsuitable terrain (water condition) by the pilot. The rough water condition was a related factor.
- [NTSB ANC89IA059](https://openairdocs.org/ntsb/ANC89IA059.md): De Havilland DHC-6-100 · Barrow, AK · Incident · No injuries · Incident investigation · Final report · Apr 14, 1989 · N100AP · No damage
  > The propagation of a fatigue crack from multiple origins due to manufacturing defects in the elevator bellcrank mounting quadrant.
- [NTSB ANC89LA021](https://openairdocs.org/ntsb/ANC89LA021.md): de Havilland DHC-6 · Homer, AK · Accident · No injuries · Limited investigation · Final report · Dec 4, 1988 · N525EH · Substantial damage
  > After landing, the plt was advised to taxi to the ramp via the south taxiway, since this was the only taxiway that had been snow plowed. Only about a 12 ft width of the 80 ft wide taxiway had been plowed. The cleared portion was on the outer edge of the…
- [NTSB ANC86LA025](https://openairdocs.org/ntsb/ANC86LA025.md): de Havilland DHC-6 · Mekoryuk, AK · Accident · No injuries · Limited investigation · Final report · Feb 7, 1986 · N204EH · Substantial damage
  > The PIC stated that he was landing to the southwest because the fog was obscuring the apch path to rwy 05. After aligning with rwy 23, the acft drifted off course. The plt was attempting to realign the acft with the rwy when he touched down in a bank and…
- [NTSB ANC85FA054](https://openairdocs.org/ntsb/ANC85FA054.md): de Havilland DHC-6-300 · Barter Island, AK · Accident · Serious injuries · Field investigation · Final report · Mar 12, 1985 · N540N · Substantial damage
  > Acft crashed during missed apch to temporary winter landing strip. Acft hit in steep nose down attitude. Marginal wx conditions prevailed, with icing reported.
- [NTSB ANC82IA048](https://openairdocs.org/ntsb/ANC82IA048.md): De Havilland DHC-6-100 · Near Port Heide, AK · Incident · No injuries · Incident investigation · Final report · Jun 16, 1982 · N525N · Minor damage
  > While in cruise flight, the left engine surged twice and the pilot observed fire emitting from the exhaust and cowling. After securing the engine and discharging the fire bottle without effect, the pilot made a precautionary landing at Port heiden airport.…
- [NTSB DCA82AA022](https://openairdocs.org/ntsb/DCA82AA022.md): de Havilland DHC-6-200 · Hooper Bay, AK · Accident · Serious injuries · Final report · May 16, 1982 · N103AQ · Destroyed
  > At 0833 adt, the acft departed bethel, AK on a scheduled pax/cargo commuter flt to chevak, scammon bay & Hooper Bay, AK. The operator's commuter flts had not landed at scammon bay for svrl days since the rwy was soft & muddy from meltingsnow. Bfr departing…
- [NTSB ANC79DA036](https://openairdocs.org/ntsb/ANC79DA036.md): Dehavilland DHC-6 · Anaktuvuk Pass, AK · Accident · No injuries · Closed · Jan 28, 1979 · N851TB · Substantial damage
- [NTSB ANC79FA004](https://openairdocs.org/ntsb/ANC79FA004.md): Dehavnd Can DHC-6 · Barrow, AK · Accident · 1 fatal · Closed · Oct 13, 1978 · N4048B · Substantial damage
- [NTSB DCA77AA026](https://openairdocs.org/ntsb/DCA77AA026.md): Dehavilland DHC-6 · Iliamna, AK · Accident · 13 fatal · Closed · Sep 6, 1977 · N563MA · Destroyed
- [NTSB ANC77DA035](https://openairdocs.org/ntsb/ANC77DA035.md): Dehavilland DHC-6 · Emmonak, AK · Accident · No injuries · Closed · Mar 9, 1977 · N2714R · Substantial damage
- [NTSB ANC70A0021](https://openairdocs.org/ntsb/ANC70A0021.md): Dehavilland DHC-6 · Sagwon, AK · Accident · 2 fatal · Closed · Sep 6, 1969 · N2711N · Destroyed

## 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.aircraft_model_code IN ('2802606'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=2802606&state=AK

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