# NTSB investigations: Allison 250 SER 250HP: 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 FTW04FA029](https://openairdocs.org/ntsb/FTW04FA029.md): Bell 407 · High Island 573 · Accident · 1 fatal · Field investigation · Final report · Dec 1, 2003 · N457PH · Destroyed > The loss of engine power due to the failure of the 3rd stage turbine wheel and subsequent catastrophic failure of the turbine assembly. - [NTSB LAX97LA039](https://openairdocs.org/ntsb/LAX97LA039.md): McDonnell Douglas 369D · Hana, HI · Accident · No injuries · Limited investigation · Final report · Nov 13, 1996 · N8625F · Substantial damage > subsequent failure of the spur adapter gearshaft (SAG), after 'retaining ring to compressor impeller machining' occurred and allowed the SAG to shift aft. The mechanism which induced the ring to impeller machining was not determined. Mountainous terrain in… - [NTSB MIA96LA180](https://openairdocs.org/ntsb/MIA96LA180.md): Bell 206B · Pigeon Forge, TN · Accident · Serious injuries · Limited investigation · Final report · Jul 11, 1996 · N999TV · Substantial damage > fatigue failure of the engine PC line, induced by damage from improper installation, which resulted in a loss of engine power and an autorotative landing to unsuitable terrain. - [NTSB FTW93LA228](https://openairdocs.org/ntsb/FTW93LA228.md): Bell 206B · Pearland, TX · Accident · No injuries · Limited investigation · Final report · Aug 4, 1993 · N16814 · Substantial damage > Pilot's failure to maintain proper rotor RPM, the delayed flare, and improper touchdown. Factors were total failure of the power turbine due to oil starvation to the #8 bearing assembly. - [NTSB FTW90LA096](https://openairdocs.org/ntsb/FTW90LA096.md): Bell 206L-1 · E. Island Blk15 · Accident · Serious injuries · Limited investigation · Final report · Apr 17, 1990 · N1071A · No damage > The loss of continuity in the compressor section of the engine due to a fatique failure of the spur adapter gear shaft. - [NTSB SEA88FA050](https://openairdocs.org/ntsb/SEA88FA050.md): Bell 206A · Roseburg, OR · Accident · Serious injuries · Field investigation · Final report · Feb 18, 1988 · N7981J · Substantial damage > While hovering at 200' AGL, the eng lost power & the plt entered an autorotation. He maneuvered to avoid trees & landed amid tree stumps in a logging clear cut area. An investigation revealed the 1st stage turbine wheel had failed. The wheel exited the eng &… - [NTSB BFO87FA057](https://openairdocs.org/ntsb/BFO87FA057.md): Bell 206B · Washington, DC · Accident · 3 fatal · Field investigation · Final report · Aug 21, 1987 · N83080 · Destroyed > The helicopter was on a LCL photography (sight-seeing) flt. While hovering at aprx 200' abv the potomac river, the eng lost pwr. The plt initiated an autorotation & deployed the emerg floats. Subsequently, the helicopter impacted in the river & rolled ovr,… - [NTSB FTW84LA414](https://openairdocs.org/ntsb/FTW84LA414.md): Bell 206L-1 · West Delta 105 · Accident · No injuries · Limited investigation · Final report · Sep 26, 1984 · N5013F · Substantial damage > While in cruise flt, total pwr loss was experienced. Plt setup autorotative water landing, deployed emergency floats. Right float was not fully inflated by water touchdown, acft rolled right to inverted position. Eng teardown revealed carbon buildup between… - [NTSB NYC84FA009](https://openairdocs.org/ntsb/NYC84FA009.md): Bell 206B III · Hudson, NH · Accident · 1 fatal · Field investigation · Final report · Oct 18, 1983 · N5011N · Destroyed > The plt was on a flt to pick up film for a tv station. While en route, he made a mayday call to the manchester control tower. According to witnesses, the acft was proceeding in a northerly direction at about 700 to 1000 ft AGL when they heard a 'muffled pop.'… - [NTSB SEA83LA205](https://openairdocs.org/ntsb/SEA83LA205.md): Hughes 369B · Cougar, WA · Accident · Minor injuries · Limited investigation · Final report · Sep 26, 1983 · N10966 · Destroyed > The aircraft collided with trees and terrain during a forced landing attempt following an in-flight power loss. Subsequent engine teardown revealed failure of several components. - [NTSB ANC83LA138](https://openairdocs.org/ntsb/ANC83LA138.md): Hughes 369D · Mcgrath, AK · Accident · No injuries · Limited investigation · Final report · Aug 5, 1983 · N1106Z · Substantial damage > The plt stated that he was flying straight & level at aprx 700 ft AGL, when the eng-out light illuminated. He began an autorotation to a ridgeline. During the landing, the main rotor blades contacted the tail boom & severed it from the main fuselage. An… - [NTSB SEA82DA137](https://openairdocs.org/ntsb/SEA82DA137.md): Hughes 369D · Shelton, WA · Accident · No injuries · Final report · Aug 7, 1982 · N10966 · Substantial damage > During a sight seeing flight the pilot smelled a burning odor and prepared to make a precautionary off-airport landing. Shortly thereafter, engine RPM decayed and an autorotative landing was effected on a dirt road. On touchdown, the main rotor blades flexed… ## 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 ('03002', '03003') 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=03002&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.