Fatal NTSB investigations: Dehavilland DHC-6 TWIN OTTER

24 cases on aircraft the registry lists as Dehavilland DHC-6 TWIN OTTER. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.

Defining event

Finding

Phase of flight

Aircraft model

Cases per year

19692026

Fatal NTSB investigations: Dehavilland DHC-6 TWIN OTTER per year, 1969–2026: 24 cases
1969	2
1972	2
1976	1
1977	1
1978	3
1979	2
1983	1
1985	1
1986	1
1988	1
1989	1
1992	1
1995	1
1996	1
1997	1
2001	1
2005	1
2006	1
2008	1

Where

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Query with 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."highestInjuryLevel" = 'Fatal' 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

duckdb -csv -c "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.\"highestInjuryLevel\" = 'Fatal'
    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"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

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."highestInjuryLevel" = 'Fatal'
  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

Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.

NTSB NYC08FA218Accident · 1 fatalField investigationFinal reportDehavilland DHC6 · Hyannis, MAThe pilot's failure to remove the flight control lock prior to takeoff. Contributing to the accident was the Federal Aviation Administration's failure to issue an airworthiness directive making the manufacturer's previously-issued flight control lock service…Jun 18, 2008 · N656WA · Substantial damage NTSB CHI06FA210Accident · 6 fatalClass 1 · FieldFinal reportde Havilland DHC-6-100 · Sullivan, MOthe pilot's failure to maintain airspeed following a loss of power in the right engine due to the fracturing of compressor turbine blades for undetermined reasons. Contributing to some parachutists' injuries was the lack of a more effective restraint system…Jul 29, 2006 · N203E · Substantial damage NTSB MIA05LA096Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6 · Deland, FLThe pilot's inadequate visual lookout.Apr 23, 2005 · N24HV · Substantial damage NTSB FTW01LA132Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6 Twin Otter · Fentress, TXthe King Air pilot's inadequate in-flight planning/decision in that he failed to remain in the agreed on formation position, resulting in one of his skydiver's contacting the propeller of the de Havilland airplane. A contributing factor was the lack of total…May 27, 2001 · N125PM · Minor damage NTSB MIA98LA031Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6-6 · Elberta, ALa passenger's inadvertent encounter with a rotating propeller.Nov 8, 1997 · N1022S · Minor damage NTSB MIA96LA135Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6 · Raeford, NCfailure of the passenger to follow the instructions of ground personnel as she exited the aircraft.Apr 27, 1996 · N716NC · No damage NTSB FTW95LA309Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6 · Belen, NMThe parachutist's failure to follow procedures on exiting the aircraft. A factor was the parachutist's incapacitation due to hitting his head on the doorway floor.Jul 23, 1995 · N926MA · No damage NTSB LAX92MA183Accident · 16 fatalMajor investigationFinal reportde Havilland DHC-6-200 · Perris, CAThe pilot-in-command's inadvertent feathering of the wrong propeller following an engine power loss, and the failure of the operator to assure that the pilot was provided with adequate training in the airplane. Factors related to the accident were: water…Apr 22, 1992 · N141PV · Destroyed NTSB DCA89MA076Accident · 10 fatalClass 1 · MajorFinal reportde Havilland DHC-6-300 · Grand Canyon, AZImproper pilot techniques and crew coordination during the landing attempt, bounce, and attempted go-around.Sep 27, 1989 · N75GC · Destroyed NTSB BFO88FA067Accident · 1 fatalField investigationFinal reportde Havilland DHC-6-200 · Chantilly, VAThe pilot inadvertently misused the flaps, by failing to set the flaps to the proper setting. The flaps were set full down. This caused the aircraft to pitch up steeply after liftoff. Additionally, the flight control lock was probably installed during some…Jul 20, 1988 · N7267 · Destroyed NTSB DCA86AA028Accident · 25 fatalFinal reportde Havilland DHC-6-300 · Grand Canyon, AZAt about 0933 MST, Dehavilland DHC-6, N76GC, (owned & operated by Canyon airlines) & bell 206B, N6TC, (operated by heliteck) collided while on sightseeing flts over the Grand Canyon national park. After colliding in flt, both acft crashed & burned in the…Jun 18, 1986 · N76GC · 2 aircraft · Destroyed NTSB NYC86FA006Accident · 1 fatalField investigationFinal reportde Havilland DHC-6 · Homer City, PAThe acft was observed flying at low altitude along about a 5 mile distance. Some witnesses described the acft altitude as just above treetops. Witness heard engine sounds and saw lights on the acft. The acft flight was on a southeast direction before it…Oct 12, 1985 · N3257 · Destroyed NTSB FTW83LA177Accident · 1 fatalLimited investigationFinal reportde Havilland DHC-6 · Mckinney, TXThree observers accompanied the aircrew & other passengers on a flt to transport skydivers aloft. Prior to the flt, all 3 of the observers were briefed not to exit the acft until the engines were secured. However, 1 of the 3 discussed the need to move a…Apr 3, 1983 · N927BA · No damage NTSB DCA79AA019Accident · 1 fatalClosedDehavilland DHC-6 · Hyannis, MAJun 17, 1979 · N383EX · Destroyed NTSB DCA79AA018Accident · 17 fatalClosedDehavilland DHC-6 · Rockland, MEMay 30, 1979 · N68DE · Destroyed NTSB DCA79AA003Accident · 2 fatalClosedDehavilland DHC-6 · Steamboat Spgs, CODec 4, 1978 · N25RM · Destroyed NTSB ANC79FA004Accident · 1 fatalClosedDehavnd Can DHC-6 · Barrow, AKOct 13, 1978 · N4048B · Substantial damage NTSB DEN78FA020Accident · 3 fatalClosedDehavilland DHC-6 · Pueblo, COJan 18, 1978 · N982FL · Destroyed NTSB DCA77AA026Accident · 13 fatalClosedDehavilland DHC-6 · Iliamna, AKSep 6, 1977 · N563MA · Destroyed NTSB DCA77AA006Accident · 3 fatalClosedDehavilland DHC-6 · Wildwood, NJDec 12, 1976 · N101AC · Destroyed NTSB OAK73DJY01Accident · 3 fatalClosedDehavilland DHC-6 · Tha Tam Blng, LaosJul 25, 1972 · N5662 · Destroyed NTSB DCA72AZ012Accident · 13 fatalClosedDehavilland DHC-6 · Appleton, WIJun 29, 1972 · N4043B · 2 aircraft · Destroyed NTSB ANC70A0021Accident · 2 fatalClosedDehavilland DHC-6 · Sagwon, AKSep 6, 1969 · N2711N · Destroyed NTSB NYC70A0010Accident · 3 fatalClosedDehavilland DHC-6 · Jamaica, NYJul 15, 1969 · N558MA · Destroyed