# NTSB investigations: Allison 250-C20 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 SEA07LA108](https://openairdocs.org/ntsb/SEA07LA108.md): Hughes 369D · Kahuku, HI · Accident · Minor injuries · Limited investigation · Final report · Apr 20, 2007 · N911FT · Substantial damage > Fatigue cracking of the oil line from the engine gearbox to the oil pressure gauge, which resulted in loss of engine lubricating oil, leading to seizure of the power turbine. - [NTSB DFW05FA032](https://openairdocs.org/ntsb/DFW05FA032.md): Hughes 369D · Zachary, LA · Accident · Serious injuries · Field investigation · Final report · Dec 9, 2004 · N7148Z · Substantial damage > The loss of engine power as a result of fatigue cracking of the compressor adaptor coupling initiated by fretting on the pilot diameter and subsequent disconnection of the compressor from the turbine assembly. A contributing factor was the low operating… - [NTSB CHI04LA027](https://openairdocs.org/ntsb/CHI04LA027.md): Bell 206B · Coleman, WI · Accident · Minor injuries · Limited investigation · Final report · Nov 3, 2003 · N3198C · Destroyed > The loss of engine power for undetermined reasons and the unsuitable terrain encountered for the forced landing. The garage building was a factor. - [NTSB SEA03FA169](https://openairdocs.org/ntsb/SEA03FA169.md): Aerospatiale AS350D · Webb, ID · Accident · Serious injuries · Field investigation · Final report · Aug 13, 2003 · N57731 · Substantial damage > An over temperature condition within the gas generator turbine which led to first stage turbine blade fatigue as well as first stage blade track warping and consequent blade tip rub. The fatigue and blade tip rub ultimately led to blade separation and failure… - [NTSB ANC03LA073](https://openairdocs.org/ntsb/ANC03LA073.md): Bell 206B · Aniak, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 2003 · N111MT · Substantial damage > The compressor discharge pressure line (Pc line) B-nut coming loose at the fuel control unit, which resulted in a total loss of engine power, and subsequent in-flight collision with trees during an autorotation. A factor associated with the accident was the… - [NTSB LAX03LA183](https://openairdocs.org/ntsb/LAX03LA183.md): Bell 206B · Malone, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 6, 2003 · N242TK · Substantial damage > a fuel starvation induced loss of engine power due to fuel contamination. - [NTSB LAX02GA209](https://openairdocs.org/ntsb/LAX02GA209.md): McDonnell Douglas 369E · Ontario, CA · Accident · Serious injuries · Final report · Jun 25, 2002 · N40NT · Destroyed > The mechanic's improper maintenance procedures (FOD prevention) during a 100-hour inspection, which resulted in foreign object damage (FOD) to the compressor section and catastrophic engine failure. Factors were the presence of vehicles and power lines… - [NTSB LAX01FA306](https://openairdocs.org/ntsb/LAX01FA306.md): Bell 206B · Hilo, HI · Accident · Minor injuries · Field investigation · Final report · Sep 30, 2001 · N206KS · Destroyed > The failure of the mechanic to secure the No. 8 bearing thrust nut during maintenance work, which resulted in the total failure of the first stage turbine wheel shaft. Also causal was his misjudgment of his height during the flare resulting in a hard landing.… - [NTSB LAX00LA047](https://openairdocs.org/ntsb/LAX00LA047.md): Boeing 369E · Taft, CA · Accident · No injuries · Limited investigation · Final report · Nov 30, 1999 · N5238C · Substantial damage > The fatigue failure of a second stage compressor vane due to erosion, which resulted in a catastrophic engine failure. An inadequate inspection of the compressor section by company maintenance personnel during the last 300-hour inspection was also causal in… - [NTSB LAX97LA120](https://openairdocs.org/ntsb/LAX97LA120.md): McDonnell Douglas MD 369HS · Pacific Ocean (Pacific Ocean) · Accident · No injuries · Limited investigation · Final report · Mar 11, 1997 · N95MS · Destroyed > A loss of engine power due to a deteriorated compressor air seal, which resulted from inadequate maintenance inspection of the helicopter to detect corrosion in the compressor case while being operated in a marine environment. - [NTSB LAX96LA104](https://openairdocs.org/ntsb/LAX96LA104.md): Bell 206BIII · Kamuela, HI · Accident · No injuries · Limited investigation · Final report · Feb 1, 1996 · N90194 · Substantial damage > failure of the nose case (No.1) bearing resulting in oil starvation. - [NTSB MIA95LA078](https://openairdocs.org/ntsb/MIA95LA078.md): Hughes 500C · Key Largo, FL · Accident · No injuries · Limited investigation · Final report · Feb 20, 1995 · N7172Z · Substantial damage > The pilot's misjudgment of altitude and failure to apply collective cushioning pitch during an autorotation resulting in a hard landing. Contributing to the accident was a total loss of engine power due to a loose coupling B-nut on the pneumatic fuel control… - [NTSB FTW94LA110](https://openairdocs.org/ntsb/FTW94LA110.md): Bell 206B · Belen, NM · Accident · No injuries · Limited investigation · Final report · Mar 27, 1994 · N2779B · Substantial damage > The hard landing due to a delayed flare and improper touchdown. A factor was the loss of engine power. - [NTSB LAX89LA141](https://openairdocs.org/ntsb/LAX89LA141.md): Hughes 369D · Vallejo, CA · Accident · No injuries · Limited investigation · Final report · Mar 31, 1989 · N5108E · Substantial damage > Fatigue failure of a defective pc tube assembly resulting in a loss of engine power. A contributing factor was the unsuitable terrain. - [NTSB FTW89LA036](https://openairdocs.org/ntsb/FTW89LA036.md): Bell 206B-III · S.Timbalier 151 · Accident · Minor injuries · Limited investigation · Final report · Jan 3, 1989 · N22704 · Destroyed > A collision between the aircraft and the platform during the emergency autorotation which caused the left skid and float to separate and destabilized the autorotation. The collision was probably unadoidable due to the maneuver that was being conducted at the… - [NTSB LAX86LA155](https://openairdocs.org/ntsb/LAX86LA155.md): Bell 206B · Huntington Bch, CA · Accident · No injuries · Limited investigation · Final report · Mar 23, 1986 · N49643 · Substantial damage > A Bell 206B collided with a berm after an eng failure while departing a helipad. The plt indicated he had just departed the helipad at night and at aprx 50 ft AGL the eng failed. The acft vertical fin hit the berm causing the tail boom to bend aft of the… - [NTSB LAX86LA091](https://openairdocs.org/ntsb/LAX86LA091.md): Bell 206B-3 · Waimea, HI · Accident · Minor injuries · Limited investigation · Final report · Jan 16, 1986 · N3179X · Substantial damage > While on a local flt, the plt descended to aprx 500 ft AGL and flew the helicopter along a coastal area. He reported the helicopter suddenly lost power and he initiated an autorotative landing to the beach where the helicopter 'had a hard landing.' An exam… - [NTSB FTW84LA270](https://openairdocs.org/ntsb/FTW84LA270.md): Bell 206B · South Pelto · Accident · Minor injuries · Limited investigation · Final report · Jun 8, 1984 · N2276Q · Substantial damage > While cruising at 550 ft above the gulf of Mexico, the plt noted hi tot indications, followed by loss of N1 RPM & eng failure. An autorotation was initiated which terminated in a hard landing in 5 ft waves. One emergency float separated during the landing &… - [NTSB ANC83FA144](https://openairdocs.org/ntsb/ANC83FA144.md): Bell 206L-1 · Bettles, AK · Accident · No injuries · Field investigation · Final report · Aug 13, 1983 · N1081K · Substantial damage > According to the plt, the low fuel warning light illuminated when the fuel gage was indicating 200 lbs. He reported he could see the arpt lights & elected to continue the flt. After arriving, he terminated his apch to a 30 to 50 ft hover with no forward… ## 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 ('03020') 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=03020&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.