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NTSB investigations: Lycoming 0-540 series, OK

72 cases on aircraft whose registry engine model is Lycoming 0-540 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.

Defining event

Finding

Phase of flight

Aircraft model

Cases per year

19642026

NTSB investigations: Lycoming 0-540 series, OK per year, 1964–2026: 72 cases
1964	9
1965	4
1966	3
1967	6
1968	4
1969	3
1970	1
1971	1
1974	2
1975	1
1976	1
1977	1
1978	1
1979	4
1980	2
1981	3
1983	1
1989	1
1991	2
1992	1
1993	1
1994	2
1995	1
1996	1
1999	1
2000	2
2006	1
2011	2
2012	1
2015	1
2016	1
2017	1
2018	1
2021	1
2023	1
2024	2
2025	1

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" = 'OK' 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 ('41532')) 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\" = 'OK' 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 ('41532'))
  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" = 'OK' 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 ('41532'))
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 CEN26LA073Accident · Minor injuriesClass 4 · LimitedFinal reportRockwell International 114 · Stroud, OKThe pilot’s inadequate fuel planning, which resulted in a total loss of power due to fuel exhaustion.Dec 13, 2025 · N5879N · Substantial damage NTSB CEN24LA370Accident · No injuriesClass 4 · LimitedFinal reportPiper PA-25-235 · Muskogee, OKThe pilot’s inattention to refueling during turn-around operations which resulted in a loss of engine power due to fuel exhaustion.Sep 26, 2024 · N6548Z · Substantial damage NTSB CEN24LA122Accident · No injuriesClass 4 · LimitedFinal reportPiper PA32 · Tulsa, OKThe pilot's inadvertent retraction of the flaps while landing which resulted in a hard landing and loss of directional control.Feb 23, 2024 · N3645W · Substantial damage NTSB CEN23FA360Accident · Serious injuriesClass 3 · FieldFinal reportPiper PA-24-250 · Oklahoma City, OKThe pilot’s mismanagement of fuel, which resulted in fuel starvation and a subsequent total loss of engine power.Aug 13, 2023 · N7910P · Substantial damage NTSB CEN21LA218Accident · No injuriesClass 4 · LimitedFinal reportCessna R182 · Tulsa, OKThe pilot’s inability to extend the main landing gear due to incomplete maintenance, which resulted in a partial wheels-up landing and the mechanic’s failure to follow proper maintenance procedures that led to the loss of main landing gear system hydraulic…May 13, 2021 · N8051B · Substantial damage NTSB CEN18LA075Accident · Serious injuriesLimited investigationFinal reportPiper PA 28-236 · Tishomingo, OKThe pilot’s inadequate preflight fuel planning and in-flight fuel monitoring and his decision to take off with an unverified amount of fuel, which resulted in fuel exhaustion and a subsequent impact with trees during an attempted forced landing.Jan 13, 2018 · N4345K · Substantial damage NTSB GAA18CA082Accident · No injuriesData collectionFinal reportPiper PA28 · Pocasset, OKThe pilot’s improper approach path, which resulted in the airplane landing short of the runway.Dec 9, 2017 · N8856W · Substantial damage NTSB GAA17CA037Accident · No injuriesData collectionFinal reportPiper PA24 · Wagoner, OKThe pilot's failure to maintain directional control during landing in gusting wind conditions.Oct 16, 2016 · N8277P · Substantial damage NTSB CEN15LA238Accident · No injuriesLimited investigationFinal reportPiper PA-25-235 · Omega, OKImproper base metal preparation or contamination of the No. 5 cylinder wall before it was coated, which resulted in the coating peeling off of the cylinder wall and contaminating the engine oil and the subsequent partial loss of engine power.May 11, 2015 · N7279Z · Substantial damage NTSB CEN12LA299Accident · No injuriesLimited investigationFinal reportPiper PA-24-250 · Shawnee, OKThe improper installation of the mixture cable by maintenance personnel, which allowed the mixture cable to entangle with the landing gear during gear extension and led to the subsequent loss of engine power.May 14, 2012 · N7171P · Substantial damage NTSB CEN12FA101Accident · 2 fatalField investigationFinal reportPiper PA-28-235D · Chickasha, OKThe non-instrument-rated pilot's decision to continue flight into instrument meteorological conditions, which resulted in the pilot’s spatial disorientation and loss of control of the airplane. Contributing to the accident was the pilot’s lack of instrument…Dec 10, 2011 · N999RR · Substantial damage NTSB CEN11CA378Accident · No injuriesData collectionFinal reportPiper PA-32-260 · Wagoner, OKThe airplane's collision with a deer during the landing flare and touchdown.Jun 6, 2011 · N3534W · Substantial damage NTSB DFW06LA191Accident · No injuriesLimited investigationFinal reportCessna R182 · McAlester, OKThe in-flight fuel leak and fire as result of electrical arcing of a fuel line connecting the engine driven fuel pump and the electric fuel pump.Jul 25, 2006 · N7364T · Destroyed NTSB FTW00LA263Accident · No injuriesLimited investigationFinal reportPiper PA-32-260 · Clinton, OKThe pilot's improper setting of the cockpit fuel selector, which resulted in a total loss of engine power and forced landing.Jun 3, 2000 · N3869W · Substantial damage NTSB FTW00LA158Accident · No injuriesLimited investigationFinal reportCessna 182RG · Sand Springs, OKThe pilot's failure to maintain directional control during the takeoff. A factor was the fence struck by the aircraft.May 28, 2000 · N736BA · Substantial damage NTSB FTW00LA018Accident · No injuriesLimited investigationFinal reportPiper PA-24-250 · Oklahoma City, OKThe failure of the pilot to follow the landing checklist and verify that the landing gear was down and locked, which resulted in a wheels up landing. A factor was the failure of the landing gear locking mechanism for an undetermined reason.Oct 22, 1999 · N6774P · Substantial damage NTSB FTW96LA358Accident · Serious injuriesLimited investigationFinal reportPiper PA-28-235 · Tulsa, OKlow fluid level in the hydraulic reservoir, due to inadequate maintenance/inspection, which resulted in an inoperative brake system. Factors relating to the accident were: the down sloping runway, and trees at the departure end of the runway.Aug 24, 1996 · N8565W · Substantial damage NTSB FTW95LA149Accident · Minor injuriesLimited investigationFinal reportPiper PA-25-235 · Catoosa, OKThe pilot's failure to maintain terrain and obstacle clearance.Mar 30, 1995 · N4900Y · Substantial damage NTSB FTW94FA220Accident · 2 fatalField investigationFinal reportSIAI-Marchetti F.260 · Dover, OKFailure of the pilot to maintain adequate altitude while performing an aerobatic demonstration. Factors related to the accident were: the pilot's inadequate training, his lack of experience in the type of operation, and insufficient FAA oversight of this type…Jul 5, 1994 · N260MS · Destroyed NTSB FTW94LA126Accident · Minor injuriesLimited investigationFinal reportPiper PA-25-260 · Muskogee, OKThe pilot's failure to maintain clearance with the power line. Factors were a chemical spray contaminated windscreen, the resultant limitation to visibility, and sun glare.Apr 16, 1994 · N4647Y · Substantial damage NTSB FTW93FA132Accident · 1 fatalField investigationFinal reportPiper PA-23-250 · Henryetta, OKThe pilot's decision to fly into known adverse weather conditions and the ensuing spatial disorientation. Factors were the weather, and the pilot's decision to fly into IMC with inadequate flight and navigational equipment installed in the aircraft.Apr 18, 1993 · N4689P · Destroyed NTSB FTW92LA120Accident · No injuriesLimited investigationFinal reportPiper PA-25-235 · Madil, OKThe pilot's failure to maintain adequate clearance with the wires. A factor was the existing sunglare.Apr 23, 1992 · N7603Z · Substantial damage NTSB FTW92DPJ02Accident · 1 fatalFinal reportPiper PA-25 · Warner, OKThe complete loss of engine power for undetermined reason.Oct 10, 1991 · N8516L · Destroyed NTSB FTW91DPJ01Accident · Serious injuriesFinal reportPiper PA-25 · Spiro, OKA power loss for undetermined reasons. A factor was the lack of suitable terrain for the forced landing.Mar 26, 1991 · N9845P · Destroyed NTSB FTW90LA048Accident · No injuriesLimited investigationFinal reportPiper PA-32-260 · Clinton, OKPilots failure to correctly maintain the proper glidepath, which caused him to impact short of the runway.Dec 28, 1989 · N3809W · Substantial damage NTSB FTW83FA261Accident · 1 fatalField investigationFinal reportPiper PA-25-235 · Omega, OKThe plt had just completed spraying a field & was in a right turn when the right wing tip hit gently rising terrain. The owner thought that the plt might have diverted his attention while looking at a farmer's map to locate the next field. (Several similar…Jun 4, 1983 · N6551Z · Destroyed NTSB FTW81FPM21Accident · No injuriesClosedPiper PA-24 · Jenks, OKAug 28, 1981 · N6172P · Substantial damage NTSB FTW81FPM13Accident · Minor injuriesClosedPiper PA-28 · Tulsa, OKJun 20, 1981 · N8510W · Substantial damage NTSB FTW81FPJ09Accident · No injuriesClosedPiper PA-28 · Enid, OKJan 8, 1981 · N38558 · Substantial damage NTSB FTW81FPJ05Accident · No injuriesClosedMaule M-5 · Meno, OKNov 2, 1980 · N5638L · Substantial damage NTSB FTW80FPM17Accident · No injuriesClosedPiper PA-25 · Henryetta, OKAug 23, 1980 · N9558P · Substantial damage NTSB FTW80DPM01Accident · No injuriesClosedMaule M-5 · Henryetta, OKOct 9, 1979 · N6194M · Substantial damage NTSB FTW79DPJ31Accident · No injuriesClosedPiper PA-25 · Hollis, OKJul 27, 1979 · N7756Z · Substantial damage NTSB FTW80DPJ29Accident · No injuriesClosedPiper PA-25 · Clinton, OKJul 10, 1979 · N9582P · Substantial damage NTSB FTW79DPJ16Accident · No injuriesClosedPiper PA-25 · Sharon, OKMay 11, 1979 · N4742Y · Substantial damage NTSB FTW78DPJ15Accident · Serious injuriesClosedPiper PA-25 · Tonkawa, OKApr 13, 1978 · N8634L · Substantial damage NTSB FTW78FPJ10Accident · No injuriesClosedPiper PA-32 · Oklahoma City, OKDec 22, 1977 · N3476W · Substantial damage NTSB FTW76DPJ36Accident · No injuriesClosedPiper PA-24 · Elk City, OKApr 26, 1976 · N6630P · Substantial damage NTSB FTW75DPG14Accident · No injuriesClosedPiper PA-24 · Seiling, OKJan 1, 1975 · N7451P · Substantial damage NTSB FTW75DPJ02Accident · No injuriesClosedPiper PA-25 · Felt, OKJul 18, 1974 · N6997Z · Substantial damage NTSB FTW74DPJ20Accident · No injuriesClosedPiper PA-25 · Eldorado, OKJan 30, 1974 · N8848L · Substantial damage NTSB FTW72DPJ13Accident · No injuriesClosedPiper PA-24 · Midwest City, OKSep 16, 1971 · N5887P · Substantial damage NTSB FTW71FPJ03Accident · 1 fatalClosedPiper J3C-65 · Crawford, OKJul 7, 1970 · N30501 · 2 aircraft · Minor damage NTSB FTW70A0044Accident · 1 fatalClosedPiper PA-24 · Boynton, OKDec 31, 1969 · N6011P · Destroyed NTSB FTW70F0209Accident · No injuriesClosedPiper PA-24 · Hominy, OKSep 2, 1969 · N5684P · Substantial damage NTSB FTW70D0058Accident · No injuriesClosedPiper PA-25 · Guymon, OKJun 19, 1969 · N4631Y · Substantial damage NTSB FTW69F0250Accident · No injuriesClosedPiper PA-24 · Oklahoma Cty, OKOct 10, 1968 · N5809P · Substantial damage NTSB FTW69D0153Accident · No injuriesClosedPiper PA-24 · Guymon, OKAug 14, 1968 · N6498P · Substantial damage NTSB FTW68D0585Accident · No injuriesClosedPiper PA-25 · Terral, OKMay 5, 1968 · N6918Z · Substantial damage NTSB FTW68D0541Accident · Minor injuriesClosedPiper PA-24 · Hardesty, OKMar 29, 1968 · N5631P · Substantial damage