# NTSB investigations: Allison 250 SER 250HP, 1984 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 FTW85LA089](https://openairdocs.org/ntsb/FTW85LA089.md): Bell 206L-1 · Houma, LA · Accident · No injuries · Limited investigation · Final report · Dec 28, 1984 · N1075Y · Substantial damage > The plt departed into known bad wx with low ceilings and poor visibility. Very shortly after takeoff the plt elected to return to the arpt. During a descending right turn the plt broke out of IMC at a very low altitude. He pulledcollective but still landed… - [NTSB DEN85FA027](https://openairdocs.org/ntsb/DEN85FA027.md): Bell 206B-11 · Bingham Canyon, UT · Accident · 4 fatal · Field investigation · Final report · Nov 15, 1984 · N1077T · Destroyed > Pilot was taking passeengers on a sightseeng flight over the kennecott copper mine, largest open pit copper mine in the world. Helicopter collided with unmarked power lines approx 185 ft AGL. Power lines are supported by two unmarked towers on opposing hills… - [NTSB SEA85LA017](https://openairdocs.org/ntsb/SEA85LA017.md): Hughes 369D · Humptulips, WA · Accident · Minor injuries · Limited investigation · Final report · Nov 13, 1984 · N1096L · Destroyed > When the hoisting cable on the helicopter failed, the hook end rebounded into the rotor system. The rotor system failed from the structural damage imposed and the acft went into an uncontroled descent impacting the ground on the left skid. - [NTSB CHI85LA018](https://openairdocs.org/ntsb/CHI85LA018.md): Hughes 500 · Grosse Ile, MI · Accident · No injuries · Limited investigation · Final report · Oct 18, 1984 · N9034F · Substantial damage > Plt attempted to start helicopter with main rotor blades tied down. - [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 SEA84LA219](https://openairdocs.org/ntsb/SEA84LA219.md): Bell 206 · Boulder City, NV · Accident · No injuries · Limited investigation · Final report · Sep 4, 1984 · N13ML · Substantial damage > The plt was landing at a helipad that was surrounded by a wire fence. He reported that as he was about to land, he misjudged his apch & the tail rotor struck the fence. Subsequently, the helicopter hit the ground while turning right & the gear collapsed. - [NTSB DEN84FA142](https://openairdocs.org/ntsb/DEN84FA142.md): Hughes 369D · Meeker, CO · Accident · Serious injuries · Field investigation · Final report · May 2, 1984 · N1090A · Substantial damage > During slow (35-40 KTS) cruise flt at about 50 ft AGL in mountainous terrain for wildlife survey, pwr loss occurred. Auto systems briefly restored pwr, followed by a ttl loss. Plt executed emergency autorotation into trees on sloping terrain. Investigation… - [NTSB SEA84LA083](https://openairdocs.org/ntsb/SEA84LA083.md): Hughes 369D · Kent, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 1984 · N1092L · Substantial damage > The plt requested clearance to transit the seattle tca for a landing at Boeing field. He was advised of a DC-10 departing the seattle-tacoma intl arpt & was cautioned about possible wake turbulence. The DC-10 passed the helicopter with about 1 1/2 mi lateral… - [NTSB DEN84LA110](https://openairdocs.org/ntsb/DEN84LA110.md): Hiller FH 1100 · Provo, UT · Accident · No injuries · Limited investigation · Final report · Mar 16, 1984 · N5042F · Substantial damage > The acft was landed in soggy terrain and the right skid sank into the surface. One of the occupants of the helicopter deplaned to'lighten the load'and the plt overcorrected in an attempt to takeoff. The acrt rolled over onto its left side. - [NTSB DEN84LA075](https://openairdocs.org/ntsb/DEN84LA075.md): Hughes 369HS · Buffalo, WY · Accident · No injuries · Limited investigation · Final report · Jan 27, 1984 · N4507C · Substantial damage > The helicopter lost power a few minutes after takeoff and made a forced landing. The acft had been refueled from a fuel truck shortly before takeoff. Samples of fuel from the acft and the fuel truck were examined and found to contain water. ## 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 year(c."eventDate") = 1984 AND 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')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03002&year=1984 --- 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.