# NTSB investigations: Lycoming VO-435 series: Loss of engine power(total) - mech failure/malf NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB LAX99LA081](https://openairdocs.org/ntsb/LAX99LA081.md): Hiller UH-12E · Lemoore, CA · Accident · No injuries · Limited investigation · Final report · Jan 24, 1999 · N67064 · Substantial damage > The inadequate nature of the operator's maintenance, which failed to detect the primer and magneto discrepancies. An overly lean fuel mixture and/or magneto cross firing resulted in detonation, an ensuing connecting rod failure, and a total loss of engine… - [NTSB CHI97LA004](https://openairdocs.org/ntsb/CHI97LA004.md): Bell 47G-5 · Nunda, SD · Accident · No injuries · Limited investigation · Final report · Oct 6, 1996 · N7925J · Substantial damage > failure of maintenance personnel to properly torque the six accessory drive bolts, which resulted in fatigue failure of the undertorqued bolts. - [NTSB CHI93DEP05](https://openairdocs.org/ntsb/CHI93DEP05.md): Bell 47-G5 · Fulton, WI · Accident · Minor injuries · Final report · Aug 25, 1993 · N1464W · Substantial damage > the failure (fracture) of the number one cylinder intake valve retainer (keeper). - [NTSB NYC90LA122](https://openairdocs.org/ntsb/NYC90LA122.md): Bell 47G-3B1 · Becket, MA · Accident · No injuries · Limited investigation · Final report · May 31, 1990 · N39268 · Substantial damage > A power loss due to oil starvation, after maintenance personnel failed to comply with Lycoming directives during the engine overhaul. Factors related to the accident were: improper adjustment of the engine oil pressure by maintenance personnel and unsuitable… - [NTSB MIA88LA186](https://openairdocs.org/ntsb/MIA88LA186.md): Continental Copters MK6B · Callahan, FL · Accident · No injuries · Limited investigation · Final report · Jun 1, 1988 · N9080T · Substantial damage > While maneuvering the helicopter during an aerial application flt the eng quit. During the autorotative landing the helicopter landed hard. Examination of the eng revealed the accessory drive gear, which is attached to the crankshaft by 6 AN-4A bolts with the… - [NTSB SEA86LA168](https://openairdocs.org/ntsb/SEA86LA168.md): Bell 47G2A · Chehalis, WA · Accident · No injuries · Limited investigation · Final report · Jul 13, 1986 · N12848 · Substantial damage > During 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… - [NTSB SEA86LA143](https://openairdocs.org/ntsb/SEA86LA143.md): Bell 47G-2 · Zillah, WA · Accident · No injuries · Limited investigation · Final report · Jun 12, 1986 · N11VH · Destroyed > En 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.… - [NTSB LAX86LUG01](https://openairdocs.org/ntsb/LAX86LUG01.md): Texas Helicopter M74A · Daggett, CA · Accident · No injuries · Final report · Oct 19, 1985 · N51862 · Substantial damage > The plt stated he had just lifted off for a fertilizer spreading operation with an external load bucket, when the eng had a partial pwr loss at 100 ft AGL. A descent was started and the bucket was disengaged. However, while the plt was attempting to land the… - [NTSB CHI85FEV04](https://openairdocs.org/ntsb/CHI85FEV04.md): Hiller UH-12D · Breese, IL · Accident · No injuries · Final report · Sep 24, 1985 · N67182 · Substantial damage > The plt reported that the eng began losing power while he was en route at an alt of aprx 200 ft AGL. He turned & initiated an autorotation to a road construction site. The helicopter landed tail low. Subsequently, the tail boom was chopped off & the… - [NTSB ANC84LA097](https://openairdocs.org/ntsb/ANC84LA097.md): Piper PA-32-260 · Igiugig, AK · Accident · No injuries · Limited investigation · Final report · Jun 2, 1984 · N4732S · Substantial damage > During flt, the plt heard a 'loud bang' & then the eng lost power. He transmitted a mayday call & made an emergency landing on rolling tundra. During the landing, the nose & left main gear failed & the wing & prop were damaged. An exam revealed that the eng… - [NTSB FTW83FA311](https://openairdocs.org/ntsb/FTW83FA311.md): Bell 47G-2 · Bethany, OK · Accident · Minor injuries · Field investigation · Final report · Jul 3, 1983 · N2495B · Destroyed > The helicopter collided with trees and rolled over during a forced landing after engine failure. The plt had been takingpassengers up for sight-seeing for several hours. After the last flt he and his wife had departed the city park to fly back to the acft… - [NTSB LAX83FUA03](https://openairdocs.org/ntsb/LAX83FUA03.md): Bell 47G-5 · Irvine, CA · Accident · No injuries · Final report · Feb 10, 1983 · N1375X · Substantial damage > The helicopter landed hard in a field off the airport following an engine power loss. The acfr had lifted off and only traveled about 50 feet at 15 feet AGL when the power loss occurred. An engine teardown revealed that the rings on 3 cylinders had not seated… - [NTSB SEA82DA072](https://openairdocs.org/ntsb/SEA82DA072.md): Bell 47G-2 · Grandview, WA · Accident · No injuries · Final report · May 18, 1982 · N11VH · Substantial damage > While 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… ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 351)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=41525&occurrence=351 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.