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NTSB investigations: Lycoming VO-435 series, WA

49 cases on aircraft whose registry engine model is Lycoming VO-435 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 VO-435 series, WA per year, 1964–2026: 49 cases
1964	2
1965	2
1967	1
1968	2
1969	1
1970	4
1971	1
1972	2
1973	1
1974	8
1976	2
1978	3
1979	3
1981	1
1982	3
1983	1
1984	1
1985	1
1986	4
1989	1
1991	1
1995	1
1999	1
2005	1
2014	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" = 'WA' 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 ('41525')) 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\" = 'WA' 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 ('41525'))
  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" = 'WA' 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 ('41525'))
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 WPR14CA290Accident · Minor injuriesData collectionFinal reportBell 47K · Kingston, WAThe pilot's failure to maintain aircraft control during the landing approach, which resulted in an excessive descent angle and settling with power.Jul 11, 2014 · N88771 · Substantial damage NTSB SEA05LA138Accident · No injuriesLimited investigationFinal reportBell 47G-2A · Oroville, WAThe failure of the throttle cable housing, which permitted the engine's RPM to decay to the idle position. Contributing factors were the trees and the lack of suitable terrain for a forced landing.Jul 5, 2005 · N38926 · Substantial damage NTSB SEA99LA149Accident · 1 fatalLimited investigationFinal reportBell 47G-2 · Benton City, WAA loss of power for undetermined reasons and the failure of the pilot to maintain adequate rotor RPM following the power loss. Contributing factors were the pilot's lack of certification and total experience.Aug 26, 1999 · N11VH · Destroyed NTSB SEA95LA227Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH-13E · Yakima, WAFatigue failure of the bolt attaching the scissor arm assembly to the pitch control support assembly. The failure of the bolt led to a loss of collective pitch control and reduced rotor RPM.Sep 20, 1995 · N38115 · Substantial damage NTSB SEA91LA077Accident · No injuriesLimited investigationFinal reportBell BH-47G2A · Waitsburg, WAThe improper installation of the main rotor mast nut and lock washer by maintenance personnel which resulted in the separation of the main rotor system.Mar 31, 1991 · N38926 · Substantial damage NTSB SEA89LA098Accident · Serious injuriesLimited investigationFinal reportBell 47G-2 · Buena, WAThe pilot's failure to maintain an adequate visual lookout and clearance to avoid the power lines.Jun 2, 1989 · N41721 · Destroyed NTSB SEA86LA177Accident · Minor injuriesLimited investigationFinal reportBell 47G3B2 · Nahcotta, WAWhile spraying oyster beds the pilot inadvertently flew the helicopter into the ground.Jul 21, 1986 · N7092J · Destroyed NTSB SEA86LA168Accident · No injuriesLimited investigationFinal reportBell 47G2A · Chehalis, WADuring an aerial applications maneuver, a complete loss of power occurred. The power loss was caused by failure of the connecting rod bolt. The acft was too low for autorotation and the aircraft struck the ground tail low. The main rotor blade then struck the…Jul 13, 1986 · N12848 · Substantial damage NTSB SEA86LA143Accident · No injuriesLimited investigationFinal reportBell 47G-2 · Zillah, WAEn route to the local spray area a total loss of power occurred along with a loss of oil pressure. The acft was aprx 200 ft AGL over a pear orchard. The plt was attempting to autorotate onto a nearby road but the left skid caught the roof top of a metal shed.…Jun 12, 1986 · N11VH · Destroyed NTSB SEA86LA089Accident · No injuriesLimited investigationFinal reportHiller 12E · Walla Walla, WAA catastrophic failure of the planetary gear of the transmission occurred about 51 flight hours after overhaul. During forced landing a hard landing occurred severing the tail boom. A fire then erupted.Mar 30, 1986 · N87595 · Destroyed NTSB SEA85LA155Accident · No injuriesLimited investigationFinal reportBell 47G2 · Roosevelt, WAA total loss of power occurred while on a CFR 137 flight, due to fuel exhaustion. Although the fuel gauge showed 1/2 tank of fuel, the pilot failed to visually check the fuel prior to this flight. During autorotation onto a wheat field a hard landing occurred…Jul 2, 1985 · N11VH · Substantial damage NTSB SEA84LA132Accident · No injuriesLimited investigationFinal reportBell 47G2A · Buena, WAMain rotor blades contacted a wind machine during an aerial application flt. Helicopter settled into trees and rolled over. Plt said he knew the machine was there but had forgotten.Jun 14, 1984 · N11VH · Substantial damage NTSB SEA83LA122Accident · No injuriesLimited investigationFinal reportBell 47G-2 · Zillah, WAThe rotorcraft made a hard landing after colliding with trees during an autorotation. The acft had experienced an enginefailure while on a repositioning flight between aerial application operations and was forced to land. The acft was autorotated into an…Jun 11, 1983 · N41721 · Substantial damage NTSB SEA82DA112Accident · Serious injuriesFinal reportBell 47G-2 · Harrah, WAThe pilot reported that before taking off, the fuel quantity guages indicated there was sufficient fuel to complete one more load and still have an adequate reserve. After dispensing the load, the engine lost power while he was returning to the nurse truck.…Jul 15, 1982 · N6145C · Substantial damage NTSB SEA82DA072Accident · No injuriesFinal reportBell 47G-2 · Grandview, WAWhile dispensing herbicide (systox) over an apple orchard the pilot sensed that the engine was binding followed by a power loss. The pilot elected to dump the herbicide and performed a power-off autorotation landing in a grape vineyard. Investigation revealed…May 18, 1982 · N11VH · Substantial damage NTSB SEA82DA050Accident · No injuriesFinal reportBell 47G-2A · Lyle, WADuring takeoff with a load of fertilizer, insufficient power was available to maintain engine and rotor RPM and sustain flight. The pilot dumped the load, but was unable to avoid ground contact. The tail rotor struck first and separated from the aircraft. The…Apr 10, 1982 · N11VH · Substantial damage NTSB SEA81DYE31Accident · Minor injuriesClosedHiller UN-12D · Castle Rock, WAJun 10, 1981 · N62377 · Destroyed NTSB SEA80DYE03Accident · No injuriesClosedHiller Acft UH-12D · Amanda Park, WAOct 29, 1979 · N62377 · Substantial damage NTSB SEA79DYP20Accident · No injuriesClosedEL Tomcat MK5A · Moses Lake, WAMay 15, 1979 · N9044T · Destroyed NTSB SEA79AA029Accident · 1 fatalClosedHiller UH12D · Chehalis, WAApr 3, 1979 · N64867 · Minor damage NTSB SEA78FA052Accident · No injuriesClosedBell 47G3B1 · Snoqualmie Fls, WAAug 7, 1978 · N1182W · Destroyed NTSB SEA78DYP33Accident · No injuriesClosedBell 47G-2 · Benton City, WAJun 7, 1978 · N31552 · Destroyed NTSB SEA78DYM23Accident · No injuriesClosedBell 47G-2 · Goldendale, WAApr 7, 1978 · N41721 · Substantial damage NTSB SEA76DYC66Accident · No injuriesClosedBell 47G3B2 · Vancouver, WAAug 11, 1976 · N7092J · Destroyed NTSB SEA76FYG53Accident · Minor injuriesClosedBell 47G-2 · Eltopia, WAJun 9, 1976 · N2483B · Destroyed NTSB SEA75AS022Accident · 1 fatalClosedBell 47G-2 · Kingston, WANov 4, 1974 · N5160B · Destroyed NTSB SEA75FYG10Accident · Serious injuriesClosedBell 47G-2 · Quincy, WAAug 27, 1974 · N6717D · Destroyed NTSB SEA75DYG07Accident · No injuriesClosedBell 47G-2 · Royal City, WAAug 14, 1974 · N6717D · Substantial damage NTSB SEA75FYE11Accident · Serious injuriesClosedBell 47G-2A · Mercer Isl, WAAug 11, 1974 · N88AR · Destroyed NTSB SEA74DYG49Accident · No injuriesClosedBell 47G-2 · Ephrata, WAJun 24, 1974 · N2899B · Substantial damage NTSB SEA74DYG38Accident · Minor injuriesClosedBell 47G-2 · Ephrata, WAMay 4, 1974 · N7887B · Substantial damage NTSB SEA74DYE39Accident · No injuriesClosedBell 47G-2 · Forks, WAMar 3, 1974 · N5161B · Substantial damage NTSB SEA74DYC25Accident · No injuriesClosedBell 47G-2 · Spokane, WAFeb 24, 1974 · N59H · Substantial damage NTSB SEA74DYE20Accident · No injuriesClosedBell 47F-2 · Forks, WAOct 8, 1973 · N5161B · Substantial damage NTSB SEA73DYG02Accident · No injuriesClosedBell 47G-2 · Twisp, WAJul 7, 1972 · N6717D · Substantial damage NTSB SEA72DYG45Accident · No injuriesClosedBell 47G-2 · Warden, WAJun 4, 1972 · N1657 · Substantial damage NTSB SEA72DYE16Accident · No injuriesClosedBell 47G2 · Clallam Bay, WAOct 6, 1971 · N5160B · Substantial damage NTSB SEA71FWG17Accident · Minor injuriesClosedBell 47G-2 · Wenatchee, WASep 9, 1970 · N2483B · Substantial damage NTSB SEA71DWD09Accident · Minor injuriesClosedBell 47G3B1 · Diablo, WAAug 7, 1970 · N1182W · Substantial damage NTSB SEA70FWD13Accident · No injuriesClosedBell 47-G2 · Maple Valley, WAMay 9, 1970 · N6141 · Substantial damage NTSB SEA70DWD05Accident · No injuriesClosedBell 47G-2 · Rochester, WAFeb 25, 1970 · N2899B · Substantial damage NTSB SEA70D0034Accident · Serious injuriesClosedBell 47G-2 · Centralia, WAMay 18, 1969 · N2498B · Destroyed NTSB SEA68D0297Accident · No injuriesClosedBell 47G-2 · Mansfield, WAMay 10, 1968 · N6717D · Substantial damage NTSB SEA68D0296Accident · No injuriesClosedBell 47G-2 · Bridgeport, WAApr 24, 1968 · N6717D · Substantial damage NTSB SEA67A0071Accident · No injuriesClosedBell 47G-2 · Kennewick, WAJun 1, 1967 · N6145C · Substantial damage NTSB SEA66A0032Accident · Minor injuriesClosedBell 47G-2 · 38mi E.Kelso, WANov 23, 1965 · N6145C · Substantial damage NTSB SEA65A0047Accident · Minor injuriesClosedBell 47G-2 · Wenatchee, WAMar 13, 1965 · N2483B · Destroyed NTSB UNK64X3325Incident · No injuriesClosedBell B-47G2 · Monitor, WAAug 11, 1964 · N2483B · No damage NTSB UNK64X2719Accident · 1 fatalClosedBell 47G3 · Manson, WAJul 8, 1964 · N8441E · Destroyed