NTSB investigations: Lycoming IO-540 series, AK
84 cases on aircraft whose registry engine model is Lycoming IO-540 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.
Cases per year
| 1980 | 2 |
|---|---|
| 1981 | 1 |
| 1982 | 1 |
| 1983 | 3 |
| 1984 | 3 |
| 1987 | 1 |
| 1988 | 5 |
| 1989 | 1 |
| 1990 | 1 |
| 1991 | 2 |
| 1992 | 3 |
| 1993 | 5 |
| 1994 | 1 |
| 1995 | 3 |
| 1996 | 2 |
| 1998 | 3 |
| 1999 | 5 |
| 2000 | 1 |
| 2001 | 4 |
| 2002 | 3 |
| 2003 | 1 |
| 2005 | 1 |
| 2006 | 1 |
| 2007 | 1 |
| 2008 | 1 |
| 2009 | 1 |
| 2010 | 1 |
| 2011 | 2 |
| 2012 | 4 |
| 2014 | 2 |
| 2015 | 1 |
| 2016 | 2 |
| 2018 | 2 |
| 2020 | 3 |
| 2021 | 4 |
| 2023 | 2 |
| 2024 | 2 |
| 2025 | 2 |
| 2026 | 1 |
Where
Open the mapLatest cases
Query with SQL
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 ('41530', '41585'))
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 ('41530', '41585'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun 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 ANC26LA029Accident · No injuriesClass 3 · LimitedPreliminary reportMaule M-7-235 · Wasilla, AKOn April 3, 2026, at 1300 Alaska daylight time, a Maule M 7 235 airplane, N93ML, was substantially damaged during an accident near Wasilla, Alaska. The pilot and one passenger were not injured. The airplane was operated as a personal flight under the…NTSB ANC25LA099Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Petersville, AKThe pilot’s exceedance of the helicopter’s available power while landing in a remote confined area, which resulted in rotor droop and a hard landing.NTSB ANC25LA015Accident · No injuriesClass 4 · LimitedFinal reportGippsaero PTY GA8 · Nightmute, AKThe pilot’s loss of directional control while taxiing in gusting wind conditions.NTSB ANC24LA055Accident · No injuriesClass 4 · LimitedFinal reportGippsland GA-8 · Tuntutuliak, AKThe pilot's failure to maintain directional control during takeoff after an encounter with a gusting wind, which resulted in a wing strike.NTSB ANC24LA013Accident · No injuriesClass 3 · LimitedFinal reportRobinson Helicopter R44 II · Glacier View, AKA sudden stoppage of the tail rotor for unknown reasons, which resulted in the tortional overload failure of the tail rotor driveshaft.NTSB ANC23FA045Accident · 2 fatalClass 3 · FieldFinal reportPiper PA-32-300 · Old Harbor, AKThe pilot’s failure to maintain clearance from rising terrain. Contributing to the accident was the pilot’s delayed decision to turn away from the terrain.NTSB ANC23LA028Accident · No injuriesClass 4 · LimitedFinal reportMaule M-5-235C · Palmer, AKThe pilot's delayed decision to execute a go-around maneuver while landing with excess airspeed into a short strip, which resulted in a runway overrun and subsequent loss of control.NTSB ANC22LA010Accident · No injuriesClass 4 · LimitedFinal reportFound Acft Canada FBA-2C1 · Kenai, AKThe pilot’s failure to maintain directional control during takeoff, which resulted in a runway excursion.NTSB ANC21LA080Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Pelican, AKThe pilot’s loss of control while landing on a remote helipad.NTSB ANC21LA079Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Pelican, AKThe pilot’s improper preflight planning to ensure adequate power to hover out-of-ground effect while conducting external load operations.NTSB ANC21LA017Accident · Minor injuriesClass 4 · LimitedFinal reportMaule M-6-235 · Tyonek, AKThe pilot’s selection of unsuitable terrain for landing, which resulted in the airplane encountering deep snow and coming to rest inverted.NTSB ANC20CA068Accident · No injuriesClass 4 · Data collectionFinal reportRobinson R44 · Ketchikan, AKThe crew leader's decision to throw a chainsaw bar into the moving arc of the main rotor blade.NTSB ANC20LA050Accident · Serious injuriesClass 3 · LimitedFinal reportRockwell 500 · Aniak, AKA loss of engine power due to the use of improper fuel. Contributing to the accident was the failure of the pilot and ground personnel to ensure that the airplane was serviced with the proper fuel.NTSB ANC20CA023Accident · Minor injuriesClass 4 · Data collectionFinal reportRobinson R44 · Talkeetna, AKThe pilot's failure to maintain adequate clearance from snow covered terrain during an en route descent in flat light conditions, which resulted in controlled flight into terrain.NTSB ANC18LA058Accident · No injuriesLimited investigationFinal reportRobinson R44 · Bettles, AKMaintenance personnel's application of insufficient preload on the attachment hardware for the idler gear shaft during engine overhaul, which resulted in the dismounting of the idler gear shaft assembly due to wear and deformation and the subsequent total…NTSB ANC18LA032Accident · No injuriesLimited investigationFinal reportRobinson Helicopter R44 · Fairbanks, AKThe pilot's failure to maintain helicopter control while in a hovering turn, which resulted in a collision with obstacles.NTSB ANC16CA051Accident · No injuriesData collectionFinal reportRobinson Helicopter R44 II · Homer, AKAn in-flight collision with a bird resulting in damage to a tail rotor blade, which required replacement.NTSB ANC16CA031Accident · No injuriesData collectionFinal reportMaule M 6-235 · Fairbanks, AKThe pilot's decision to land on terrain unsuitable for a wheel equipped airplane.NTSB GAA16CA009Accident · No injuriesData collectionFinal reportRobinson Helicopter R44 II · Ketchikan, AKThe pilot's failure to maintain directional control during the engine start sequence, which resulted in the helicopter sliding on a steel deck and impacting a crane. Contributing to the accident was the absence of traction material on the helicopter…NTSB ANC14CA042Accident · No injuriesData collectionFinal reportRobinson Helicopter R44 II · Coldfoot, AKThe pilot's failure to maintain adequate main rotor rpm while maneuvering at a low altitude, which resulted in an emergency landing on uneven terrain.NTSB ANC14FA030Accident · 1 fatalField investigationFinal reportRobinson Helicopter R44 II · Chugiak, AKThe pilot's loss of control of the helicopter due to impairment or incapacitation from a sudden, acute cardiac event.NTSB ANC12FA083Accident · 1 fatalField investigationFinal reportPiper PA-32-301 · Hoonah, AKThe pilot's failure to maintain clearance from trees and terrain while in cruise flight in marginal visual meteorological conditions.NTSB ANC12CA082Accident · Minor injuriesData collectionFinal reportRobinson Helicopter R44 II · Wainwright, AKThe failure of ground personnel to ensure the helicopter was serviced with the proper fuel. Contributing to the accident was the pilot's failure to monitor the fueling process.NTSB ANC12FA066Accident · 2 fatalField investigationFinal reportPiper PA-32R-301 · Fairbanks, AKThe noninstrument-rated pilot's decision to continue visual flight into instrument meteorological conditions likely leading to spatial disorientation, which resulted in a loss of airplane control and in-flight structural failure.NTSB ANC12CA063Accident · No injuriesData collectionFinal reportPiper PA-32-301 · King Salmon, AKAn in-flight collision with a bird during cruise flight.NTSB ANC11CA075Accident · No injuriesData collectionFinal reportPiper PA-32-301 · Kodiak, AKA partial loss of engine power while on approach to land due to a disconnected throttle control linkage, and the maintenance director's inadequate inspection of the throttle linkage during maintenance.NTSB ANC11LA027Accident · No injuriesLimited investigationFinal reportPiper PA-32-301 · Cold Bay, AKAn in-flight encounter with unforecast turbulence, which resulted in structural damage to the stabilator.NTSB ANC10LA032Accident · No injuriesLimited investigationFinal reportPiper PA-32-301 · King Cove, AKThe pilot's failure to maintain an appropriate descent rate during gusty winds while landing, resulting in a hard landing and damage to the airplane.NTSB ANC09CA048Accident · No injuriesData collectionFinal reportPiper PA-32-301 · Birchwood, AKThe failure of maintenance personnel to properly maintain the cargo door latch, resulting in an in-flight opening and separation of the cargo door, and substantial damage to the horizontal stabilator when it was struck by remnants of the cargo door.NTSB ANC08LA046Accident · Minor injuriesLimited investigationFinal reportPiper PA-32 · Koliganek, AKThe pilot's VFR flight into adverse weather conditions that resulted in a collision with snow-covered terrain during a turn to reverse direction. Factors contributing to the accident were low ceilings, flat lighting conditions, and the snow-covered terrain.NTSB ANC07LA081Accident · Serious injuriesLimited investigationFinal reportMaule M-7-235 · Fairbanks, AKThe reversal of the elevator control cables by maintenance personnel, and the inadequate preflight inspection by the flight instructor and dual student.NTSB ANC06LA025Accident · No injuriesLimited investigationFinal reportRobinson R44 · Ilimana, AKThe pilot's continued flight into adverse weather conditions, and his spatial disorientation and loss of control during a subsequent landing attempt. Factors associated with the accident are flat light and whiteout conditions, fog, and snow-covered terrain.NTSB ANC05CA102Accident · No injuriesData collectionFinal reportPiper PA-32-301 · Karluk, AKA collision with a deer on the runway during the landing roll, which resulted in substantial damage to the tail of the airplane.NTSB ANC03LA119Accident · No injuriesLimited investigationFinal reportMaule M-7-235 · McGrath, AKFuel starvation due to the pilot's improper placement of the fuel selector to a nearly empty fuel tank prior to takeoff, resulting in a loss of engine power, and an in-flight collision with trees.NTSB ANC03LA005Accident · No injuriesLimited investigationFinal reportPiper PA-32 · Bethel, AKThe failure of both pilot's to maintain a visual outlook during taxi operations on the ramp.NTSB ANC02LA069Accident · Minor injuriesLimited investigationFinal reportPiper PA-32-300 · Kake, AKThe in-flight separation of the upper engine cowling from the airplane. A factor contributing to the accident was the soft, sandy terrain of the landing area.NTSB ANC02FA010Accident · 1 fatalField investigationFinal reportPiper PA-32 · Haines, AKThe pilot's continued VFR flight into instrument meteorological conditions, and subsequent collision with trees while in cruise flight. Factors in the accident were weather conditions consisting of freezing rain, mist, and low ceilings.NTSB ANC01FA106Accident · 1 fatalField investigationFinal reportMaule M-6-235 · Kotzebue, AKThe pilot's failure to maintain adequate clearance from an obstruction (antenna tower), and his continued flight into instrument meteorological conditions. Factors associated with the accident were low ceilings, and low visibility.NTSB ANC01FA093Accident · 6 fatalField investigationFinal reportPiper PA-32-300 · Haines, AKThe pilot's continued flight into known adverse weather conditions, and his poor in-flight decision making. Factors associated with the accident were clouds and mountainous terrain. A finding is the pilot's use of FAA prohibited drugs.NTSB ANC01LA071Accident · No injuriesLimited investigationFinal reportPiper PA-32R · Egegik, AKThe pilot's selection of unsuitable terrain for landing. Factors in the accident were a soft area of runway, and sunglare.NTSB ANC01LA056Accident · No injuriesLimited investigationFinal reportPiper PA-32R-301 · Emmonak, AKThe pilot's inadvertent stall while maneuvering. A factor associated with the accident was soft, snow-covered terrain.NTSB ANC00LA022Accident · No injuriesLimited investigationFinal reportPiper PA-32-301 · Ekuk, AKThe pilot's selection of an unsuitable runway for landing. Factors associated with the accident were the inadequate runway maintenance by the runway maintenance personnel, snow berms, and insufficient runway condition information disseminated by the company…NTSB ANC00LA013Accident · No injuriesLimited investigationFinal reportMaule M7-235C · Palmer, AKThe pilot's intentional takeoff into known adverse weather. Factors associated with this accident are crosswinds, gusts, and downdrafts.NTSB ANC00LA009Accident · No injuriesLimited investigationFinal reportPiper PA-32-300 · Russian Mission, AKThe pilot's continued flight into adverse weather, and an inadvertent stall. Factors in the accident were adverse weather consisting of icing conditions, and airframe icing.NTSB ANC99LA127Accident · No injuriesLimited investigationFinal reportMaule M-7 · Kotzebue, AKAn in-flight collision with a bird.NTSB ANC99LA109Accident · No injuriesLimited investigationFinal reportCessna A188-B · Bettles, AKThe pilot's selection of unsuitable terrain for landing. A factor was soft terrain.NTSB ANC99LA039Accident · No injuriesLimited investigationFinal reportPiper PA-32-301 · Chefornak, AKThe pilot's selection of an unsuitable landing site. A factor associated with the accident was rough and uneven terrain.NTSB ANC98LA165Accident · Serious injuriesLimited investigationFinal reportMaule ML-7 · Wasilla, AKThe pilot's inadequate compensation for the wind conditions, resulting in an inadvertent stall. Contributing factors were the gusty and turbulent weather conditions.NTSB ANC98LA023Accident · No injuriesLimited investigationFinal reportPiper PA-32-300 · Naknek, AKThe pilot's failure to maintain an adequate visual lookout. Factors in the accident were flat lighting conditions, and inadequate airport facilities.NTSB ANC98LA025Accident · No injuriesLimited investigationFinal reportPiper PA-32-300 · Kongiganak, AKThe pilot misjudged distance/altitude and airspeed, and his delay initiating a go-around. Related factors were the downdraft and snowbank.