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NTSB investigations: Franklin 6A4165 series, AK

58 cases on aircraft whose registry engine model is Franklin 6A4165 series. 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

19642026

NTSB investigations: Franklin 6A4165 series, AK per year, 1964–2026: 58 cases
1964	1
1965	1
1966	2
1967	1
1969	1
1971	2
1973	4
1975	1
1976	3
1977	3
1978	3
1979	1
1980	2
1982	1
1983	1
1984	2
1986	1
1987	1
1990	2
1991	2
1993	1
1995	2
1996	2
1998	1
1999	2
2000	2
2001	2
2004	1
2008	1
2015	1
2019	2
2020	2
2021	1
2024	1
2025	2

Where

Latest cases

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."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 ('27025')) 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.\"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 ('27025'))
  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."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 ('27025'))
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 ANC25LA058Accident · No injuriesClass 4 · LimitedFinal reportStinson 108-8 · Alexander Creek, AKThe pilot’s failure to maintain airplane control during final approach. Contributing to the accident was the airplane’s encounter with a downdraft that led to a rapid loss of altitude.Jun 25, 2025 · N97438 · Substantial damage NTSB ANC25LA036Accident · Minor injuriesClass 4 · LimitedFinal reportStinson 108 · North Pole, AKThe pilot's failure to maintain obstacle clearance which resulted in an in-flight collision with a tree. Contributing to the accident was his impairment from the effects of alcohol consumption.Apr 25, 2025 · N9308K · Substantial damage NTSB ANC24LA048Accident · No injuriesClass 4 · LimitedFinal reportStinson 108-2 · Bethel, AKThe uncertificated pilot’s decision to fly an unairworthy airplane and his failure to maintain directional control during landing, which resulted in a landing gear collapse. Contributing was the failure of the right main landing gear oleo strut.Jun 1, 2024 · N299C · Substantial damage NTSB ANC21LA086Accident · No injuriesClass 3 · LimitedFinal reportStinson 108-3 · Port Alsworth, AKA loss of directional control for reasons that could not be determined based on the available information.Sep 12, 2021 · N6476M · Substantial damage NTSB WPR20CA236Accident · No injuriesClass 4 · Data collectionFinal reportStinson 108 · Farewell Lakes, AKThe pilot's delayed decision to abort the takeoff roll, which resulted in a runway overrun and airplane nose over.Jul 8, 2020 · N134C · Substantial damage NTSB ANC20CA063Accident · No injuriesClass 4 · Data collectionFinal reportStinson 108 · Nikolai, AKThe pilot's improper decision to depart from an unsuitable off-airport surface which resulted in a departure area excursion and impact with trees.Jul 2, 2020 · N6252M · Substantial damage NTSB ANC19TA055Accident · Serious injuriesClass 4Final reportStinson 108 · Tyonek, AKThe pilot’s exceedance of the airplane’s critical angle of attack during a short field takeoff, which resulted in an aerodynamic stall and loss of control.Sep 26, 2019 · N6533M · Substantial damage NTSB GAA19CA263Accident · No injuriesData collectionFinal reportStinson 108 · Soldotna, AKThe pilot's overapplication of the brakes during landing on a soft runway, which resulted in a nose-over.May 12, 2019 · N6392M · Substantial damage NTSB GAA15LA265Accident · Serious injuriesLimited investigationFinal reportStinson 108 · Palmer, AKThe pilot's failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle-of-attack during final approach to landing, which resulted in an aerodynamic stall and impact with terrain.Sep 20, 2015 · N6066M · Substantial damage NTSB ANC08CA043Accident · Minor injuriesData collectionFinal reportStinson 108 · Chugiak, AKThe reversal of the aileron control cables by maintenance personnel, and the pilot's inadequate preflight inspection.Mar 14, 2008 · N6827M · Substantial damage NTSB ANC04LA036Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Levelock, AKThe pilot's selection of unsuitable terrain for landing, which resulted in an overrun. Factors contributing to the accident were the pilot's inadequate weather evaluation, a tailwind, and a slippery, ice-covered landing surface.Mar 23, 2004 · N97124 · Substantial damage NTSB ANC01LA104Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Palmer, AKThe pilot's selection of an unsuitable area for an off-airport landing.Aug 10, 2001 · N8090K · Substantial damage NTSB ANC01LA050Accident · Minor injuriesLimited investigationFinal reportStinson 108-3 · Glennallen, AKA total failure of the engine and subsequent rupture of the crankcase during cruise flight. A factor in the accident was unsuitable terrain for a forced landing.Apr 22, 2001 · N6912M · Destroyed NTSB ANC00LA113Accident · No injuriesLimited investigationFinal reportStinson 108-3 · Yakutat, AKThe pilot's selection of an unsuitable landing area. Factors associated with the accident were the oil sprayed windshield, the sunglare, and an object in the water which the pilot did not see.Sep 5, 2000 · N603C · Substantial damage NTSB ANC00LA032Accident · No injuriesLimited investigationFinal reportStinson 108-3 · Fairbanks, AKThe pilot's inadvertent ground loop.Mar 5, 2000 · N6453M · Substantial damage NTSB ANC99LA060Accident · Serious injuriesLimited investigationFinal reportAeronca 15AC · Pedro Bay, AKA separation of the number 3 engine cylinder head assembly, and a burned through fuel line.May 8, 1999 · N1315H · Substantial damage NTSB ANC99LA046Accident · Serious injuriesLimited investigationFinal reportStinson 108-2 · Kenai, AKThe pilot's inadequate compensation for wind conditions. A factor associated with the accident was high winds.Apr 14, 1999 · N221C · Substantial damage NTSB ANC98LA039Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Chugiak, AKThe pilot's selection of an unsuitable, slush-covered, runway for landing. A factor was the slush-covered runway.Apr 18, 1998 · N134C · Substantial damage NTSB ANC96LA046Accident · No injuriesLimited investigationFinal reportStinson ST-75 · Anchorage, AKThe pilot's failure to select the proper fuel tank prior to takeoff resulting in fuel starvation. A factor in the accident was the pilot's failure to follow the checklist.Apr 11, 1996 · N235C · Substantial damage NTSB ANC96LA048Accident · No injuriesLimited investigationFinal reportStinson 108-3 · Soldotna, AKThe pilot's inadequate compensation for wind conditions. The gusty/crosswind condition was a related factor.Mar 30, 1996 · N6443M · Substantial damage NTSB ANC95LA099Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Anchorage, AKThe pilot's loss of directional control, during the takeoff roll, which resulted in an inadvertent swerve, and the pilot's excessive application of brake pressure, which resulted in a nose down condition.Jul 7, 1995 · N257C · Substantial damage NTSB ANC95LA091Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Shishmaref, AKFailure of the pilot to abort the takeoff, while there was sufficient runway remaining. Factors relating to the accident were: unfavorable wind conditions, and failure of the pilot to lower the flaps for takeoff.Jul 1, 1995 · N9600K · Substantial damage NTSB ANC93LA094Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Dry Creek, AKThe loss of engine power for undetermined reasons.Jun 18, 1993 · N318C · Substantial damage NTSB ANC92LA020Accident · No injuriesLimited investigationFinal reportStinson 108 · Chugiak, AKThe pilot failed to maintain proper altitude during the final approach. Contributing to the accident was the pilot's lack of total experience performing landings in reduced light conditions, the poor light condition at dusk, and the snow covered terrain.Dec 15, 1991 · N767C · Substantial damage NTSB ANC91LA157Accident · No injuriesLimited investigationFinal reportStinson 108-3 · Cantwell, AKThe engine power loss for undetermined reasons and the lack of suitable terrain for a forced landing.Sep 18, 1991 · N6436M · Substantial damage NTSB ANC90LA148Accident · Serious injuriesLimited investigationFinal reportStinson 108 · Cold Foot, AKThe pilot-in-command's failure to maintain flying speed.Aug 19, 1990 · N9462K · Substantial damage NTSB ANC90LA030Accident · No injuriesLimited investigationFinal reportStinson 108-3 · Anchorage, AKThe pilot misjudged his distance and altitude to the runway on final approach, and failed to attain the proper touchdown point. Factors related to the accident were: dark night, unfavorable wind wind conditions and snow covered terrain.Jan 19, 1990 · N551C · Substantial damage NTSB ANC88LA016Accident · No injuriesLimited investigationFinal reportStinson 108-2 · Alexander Lake, AKThe relatively inexperienced private pilot attempted to land his float equipped airplane with a tailwind and gusty winds in choppy water conditions. He lost control of the airplane and it was substantially damaged.Oct 25, 1987 · N9398K · Substantial damage NTSB ANC86LA101Accident · Serious injuriesLimited investigationFinal reportStinson 108 · Hope, AKThe plt stalled the acft during final apch to a small gravel airstrip. The plt had not received training as a student plt nor did he hold any FAA plt or medical certificate.Jul 5, 1986 · N936C · Destroyed NTSB ANC84LA187Accident · Minor injuriesLimited investigationFinal reportStinson 108-2 · Cairn Mountain, AKThe acft crashed during a takeoff from a remote airstrip. The plt stated that he walked the strip prior to starting the takeoff. He said that immediately after liftoff the acft began to drift left. Before he was able to make a correction the tail of the acft…Sep 22, 1984 · N8028K · Substantial damage NTSB ANC84FA169Accident · 1 fatalField investigationFinal reportStinson 108 · Hayes River, AKThe plt was on a low level flt to spot wild game when the acft crashed on a gravel drainage bar. A witness stated the acft was flying 5 to 6 ft AGL when the accident occurred.Sep 9, 1984 · N6660M · Destroyed NTSB ANC83FA175Accident · No injuriesField investigationFinal reportStinson 108-2 · Skwentna, AKThe acft nose over after landing on a sand bar. The usable landing area was about 700 ft long & consisted of a soft mixture of sand & gravel.Sep 17, 1983 · N291C · Substantial damage NTSB ANC82FAA18Accident · Minor injuriesFinal reportStinson 108 · Fairbanks, AKThe acft collided with power lines during final approach. The plt reported he encountered a downdraft type of windshear.Sep 10, 1982 · N9489K · Substantial damage NTSB ANC80DAD06Accident · Minor injuriesClosedStinson 108-3 · Wrangell, AKMay 15, 1980 · N6756M · Substantial damage NTSB ANC80DAA09Accident · Serious injuriesClosedStinson 108-3 · Kevinjik Lk, AKMar 8, 1980 · N8044K · Destroyed NTSB ANC80DAG13Accident · No injuriesClosedStinson 108-3 · Skwentna, AKOct 31, 1979 · N6325M · Destroyed NTSB ANC78DAA38Accident · Minor injuriesClosedStinson 108-2 · Totatlanika Rv, AKAug 31, 1978 · N374C · Substantial damage NTSB ANC78DAG32Accident · No injuriesClosedStinson 108-2 · Wasilla, AKMar 17, 1978 · N143C · Substantial damage NTSB ANC78FAG26Accident · Minor injuriesClosedStinson 108-2 · Glenallen, AKFeb 21, 1978 · N9542K · Substantial damage NTSB ANC77FA066Accident · 5 fatalClosedCessna 170-A · Portage Pass, AKJul 30, 1977 · N9543A · Destroyed NTSB ANC77DAA37Accident · No injuriesClosedStinson 108 · Kotzebue, AKJul 23, 1977 · N696C · Substantial damage NTSB ANC77DAA36Accident · No injuriesClosedStinson 108 · Northway, AKJul 6, 1977 · N8270K · Substantial damage NTSB ANC76DAA69Accident · No injuriesClosedStinson 108-3 · Nenana, AKOct 28, 1976 · N4205C · Substantial damage NTSB ANC76FAA29Accident · Serious injuriesClosedStinson 108-3 · Koyuk, AKMar 21, 1976 · N6946M · Substantial damage NTSB ANC76DAG87Accident · No injuriesClosedStinson 108 · Willow, AKFeb 1, 1976 · N691C · Substantial damage NTSB ANC76DAG56Accident · No injuriesClosedStinson 108-2 · Gulkana, AKOct 17, 1975 · N9462K · Substantial damage NTSB ANC74FAA08Accident · No injuriesClosedStinson 108-2 · North Pole, AKAug 26, 1973 · N9525K · Substantial damage NTSB ANC74FAA04Accident · No injuriesClosedStinson 108-2 · North Pole, AKAug 20, 1973 · N9743K · Substantial damage NTSB ANC73FAA25Accident · No injuriesClosedStinson 108-3 · Fairbanks, AKJun 3, 1973 · N6177M · Substantial damage NTSB ANC73FAG73Accident · Minor injuriesClosedStinson 108-3 · Soldotna, AKJan 10, 1973 · N4205C · Substantial damage