# NTSB investigations: Allison 250-C20 series 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. Page 7 of 8 · 372 cases ## Cases, newest first - [NTSB LAX92T#A03](https://openairdocs.org/ntsb/LAX92T%23A03.md): Mcdonnell Douglas 369D · Mesa, AZ · Accident · No injuries · Class 3 · Final report · Feb 14, 1992 · N911FT · Substantial damage - [NTSB BFO92TA#01](https://openairdocs.org/ntsb/BFO92TA%2301.md): Mcdonnell Douglas 369E · Clinton, MD · Accident · No injuries · Final report · Feb 12, 1992 · N1600Q · Substantial damage - [NTSB LAX92FA088](https://openairdocs.org/ntsb/LAX92FA088.md): Bell 206BIII · Crockett, CA · Accident · 5 fatal · Field investigation · Final report · Jan 11, 1992 · N95AT · Destroyed > The pilot's failure to maintain vigilant watch for obstructions while intentionally cruising slowly at a low altitude. A factor was the power line was supported by distant towers, and the line was not conspicuous. - [NTSB SEA92FA016](https://openairdocs.org/ntsb/SEA92FA016.md): Bell 206B · Salt Lake City, UT · Accident · 1 fatal · Field investigation · Final report · Nov 8, 1991 · N5736B · Destroyed > The pilot failed to maintain directional control. Factors to the accident were: inadeqaute remedial action, over confidence in personal ability, and lack of recent expereince. - [NTSB SEA91TL#02](https://openairdocs.org/ntsb/SEA91TL%2302.md): Hiller-Soloy UH-12E · Vernal, UT · Accident · No injuries · Class 3 · Final report · Sep 18, 1991 · N7173S · Destroyed - [NTSB SEA91FA184](https://openairdocs.org/ntsb/SEA91FA184.md): Bell 206B · Toutle, WA · Accident · 1 fatal · Field investigation · Final report · Jul 22, 1991 · N276KA · Substantial damage > Failure of the pilot to maintain airspeed and correct for the right yawing condition. Factors to the accident were: inadequate compensation for wind conditions, diverted attention, and lack of total expereince in type of aircraft. - [NTSB LAX91LA289](https://openairdocs.org/ntsb/LAX91LA289.md): Hughes 369D · Napa, CA · Accident · No injuries · Limited investigation · Final report · Jul 5, 1991 · N18KJ · Substantial damage > The pilot's failure to maintain the proper altitude. Contributing to the accident was the pilot's improper in flight decision to fly in the below VFR weather conditions and his misjudged weather evaluation. - [NTSB SEA91FA124](https://openairdocs.org/ntsb/SEA91FA124.md): Bell 206BII · Brewster, WA · Accident · No injuries · Field investigation · Final report · May 28, 1991 · N90307 · Substantial damage > The pilot-in-command's selection of unsuitable terrain for the emergency simulation. - [NTSB LAX91LA058](https://openairdocs.org/ntsb/LAX91LA058.md): Mcdonnell Douglas 369D · Keanae, HI · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 1990 · N58240 · Substantial damage > Fuel starvation caused by a loose fuel line 'b' nut, due to improper maintenance; and the failure of the pilot to correctly judge the landing flare during the autorotation. - [NTSB LAX91LA054](https://openairdocs.org/ntsb/LAX91LA054.md): Mcdonnell Douglas 369D · Haleakla Nat Pk, HI · Accident · 1 fatal · Limited investigation · Final report · Dec 9, 1990 · N1113L · Substantial damage > Fuel starvation due to the unporting of the fuel supply pick-up. - [NTSB LAX91TL#01](https://openairdocs.org/ntsb/LAX91TL%2301.md): McDonnell Douglas 369E · Los Alamitos, CA · Accident · No injuries · Class 3 · Final report · Nov 6, 1990 · N241JH · Substantial damage - [NTSB LAX90LA298](https://openairdocs.org/ntsb/LAX90LA298.md): Bell 206B · California City, CA · Accident · No injuries · Limited investigation · Final report · Aug 22, 1990 · N250CA · 2 aircraft · Substantial damage > The failure of the helicopter pilot to maintain adequate clearance from the jump aircraft. A factor in the accident was the inability of the jump aircraft pilot to maintain visual contact with the helicopter. - [NTSB NYC90LA187](https://openairdocs.org/ntsb/NYC90LA187.md): Bell 206B · Fitchburg, MA · Accident · No injuries · Limited investigation · Final report · Aug 4, 1990 · N750LT · Substantial damage > The pilot's failure to assure that adequate fuel was on board for the flight. - [NTSB LAX90T#A08](https://openairdocs.org/ntsb/LAX90T%23A08.md): Bell 206B · San Carlos, AZ · Accident · No injuries · Class 3 · Final report · Jul 10, 1990 · N5006Y · Substantial damage - [NTSB LAX90FA060](https://openairdocs.org/ntsb/LAX90FA060.md): McDonnell Douglas 369E · Santa Rosa, CA · Accident · 1 fatal · Field investigation · Final report · Dec 29, 1989 · N1604L · Destroyed > The pilot's improper preflight planning/decision which resulted in the loss of tail rotor effectiveness. Contributing to the accident was the pilot allowing the maximum gross weight of the aircraft to be exceeded, and the tailwind. - [NTSB DEN90T#A01](https://openairdocs.org/ntsb/DEN90T%23A01.md): MBB BO-105S · Mercury, NV · Accident · No injuries · Class 3 · Final report · Oct 2, 1989 · N7EG · Substantial damage - [NTSB LAX89LA297](https://openairdocs.org/ntsb/LAX89LA297.md): Bell 206B · Murrieta, CA · Accident · No injuries · Limited investigation · Final report · Sep 6, 1989 · N111JG · Substantial damage > A partial loss of engine power due to contaminates in the fuel control unit. The origin of the contaminates was not determined. Contributing factor(s) was: the helicopter was not equipped with floats. - [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 LAX89FA136](https://openairdocs.org/ntsb/LAX89FA136.md): Aerospatiale AS-355-F · Bear Valley, CA · Accident · No injuries · Field investigation · Final report · Mar 26, 1989 · N84MH · Substantial damage > Improper in-flight planning/decision by the pilot, which resulted in a loss of aircraft control during a slow speed, downwind approach to a high altitude stolport. Contributing factors were: high density altitude, tailwind, improper weather evaluation by the… - [NTSB DEN89LA090](https://openairdocs.org/ntsb/DEN89LA090.md): Bell 222 · Leadville, CO · Accident · No injuries · Limited investigation · Final report · Mar 23, 1989 · N5008Q · Substantial damage > Failure of the pilot to compensate adequately for wind conditions with rudder pedals while maneuvering in unfavorable wind and high density altitude. - [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 ATL89FA051](https://openairdocs.org/ntsb/ATL89FA051.md): Bell 206B · Pinson, AL · Accident · No injuries · Field investigation · Final report · Dec 2, 1988 · N3TV · Substantial damage > Two FAA inspectors were conducting currency training when the helicopter landed hard during a practice power recovery autorotation. The pilot had delayed in applying power and collective pitch. Upon contact with the ground, all engine instruments indicated… - [NTSB LAX88LA322](https://openairdocs.org/ntsb/LAX88LA322.md): Hughes 369HS · Columbia, CA · Accident · No injuries · Limited investigation · Final report · Sep 16, 1988 · N9110F · Substantial damage > During an external load operation, there was an indication of high torque and the oil chip light illuminated. The engine lost power and the pilot initiated an autorotation. The helicopter collided with the sloping terrain and rolled over. Inspection of the… - [NTSB NYC88LA201](https://openairdocs.org/ntsb/NYC88LA201.md): Bell 206B · Plymouth, MA · Accident · No injuries · Limited investigation · Final report · Jul 13, 1988 · N543CC · Substantial damage > A loss of power to the engine because the fuel control was not properly adjusted and collision with terrain due to an unsuitable landing area. - [NTSB LAX88LA179](https://openairdocs.org/ntsb/LAX88LA179.md): McDonnell Douglas 369D · Waialua, HI · Accident · Serious injuries · Limited investigation · Final report · May 13, 1988 · N4943T · Destroyed > Failure to follow procedures established by the manufacture for uncommanded trim inputs and his decision to make a hover approach to landing. - [NTSB LAX88LA136](https://openairdocs.org/ntsb/LAX88LA136.md): Bell 206B · Honolulu, HI · Accident · No injuries · Limited investigation · Final report · Mar 18, 1988 · N2995W · Substantial damage > After touchdown the plt reduced the throttle and removed his left hand from the throttle/collective pitch control to retune the radio. His attention was directed to the frequency indicator during the procedure. The helicopter became airborne and moved to the… - [NTSB LAX88LA043](https://openairdocs.org/ntsb/LAX88LA043.md): Hughes 369D · Honolulu, HI · Accident · No injuries · Limited investigation · Final report · Nov 14, 1987 · N1113L · Substantial damage > The plt rprtd that during an external load operation, the helicopter ran out of fuel. Subsequently, it was damaged when it touched down hard during a forced landing. - [NTSB LAX87LA310](https://openairdocs.org/ntsb/LAX87LA310.md): Bell 206B · Kailua-Kona, HI · Accident · Minor injuries · Limited investigation · Final report · Aug 23, 1987 · N2777R · Substantial damage > As the helicopter was climbing over rising terrain at 300' to 400' AGL, the plt noted altimeter & airspeed indcns of 8700' & 60 mph. After climbing an adnl 2 min to aprx 10,000' (12,000' density alt), he noticed the rotor RPM was bleeding off. He made a 180… - [NTSB CHI87LA180](https://openairdocs.org/ntsb/CHI87LA180.md): Hughes 369HS · Griffith, IN · Accident · No injuries · Limited investigation · Final report · Jul 30, 1987 · N42405 · Substantial damage > The tail boom of the helicopter was severed after rotor blade contact during a hard landing. The acc occurred during an autorotation demo for the police dept with a power recovery. Application of power was late and the helicopter landed hard and bounced. The… - [NTSB LAX87FA173](https://openairdocs.org/ntsb/LAX87FA173.md): Hughes 369E · Palm Desert, CA · Accident · Serious injuries · Field investigation · Final report · Apr 11, 1987 · N5200W · Substantial damage > The helicopter dscndd uncontrolled & crashed in a residential area. After the acdnt, the plt said he agreed to orbit the residence of his pax. At the aprx 135 deg point of a left orbit, he felt 'a bang & severe vibration in the tail.' The plt lost drctnl ctl… - [NTSB LAX87LA157](https://openairdocs.org/ntsb/LAX87LA157.md): McDonnell Douglas 369E · Phoenix, AZ · Accident · No injuries · Limited investigation · Final report · Mar 19, 1987 · N1601Y · Substantial damage > During factory flt training, prior to delivery of the new helicopter to the owner, the CFI said he asked the student to perform a series of emergency procedures which included quick stops from an initial takeoff followed by hovering autorotations. The CFI… - [NTSB NYC87LA058](https://openairdocs.org/ntsb/NYC87LA058.md): Agusta A109AII · So. Dartmouth, MA · Accident · Minor injuries · Limited investigation · Final report · Jan 13, 1987 · N300CC · Substantial damage > Agusta N300CC departed a helipad in front of claremont corp president's residence in south Dartmouth, Massachusetts. As the helicopter was hovering prior to moving forward, the tail rotor blade, s/n 124, failed. The tail rotor assembly and gearbox separated… - [NTSB LAX87DUM01](https://openairdocs.org/ntsb/LAX87DUM01.md): Bell UH-1B · Calipatria, CA · Accident · No injuries · Final report · Dec 1, 1986 · N2770N · Substantial damage > During the initial climb at the beginning of an aerial application flight, the pilot made a climbing 180 degree right turn in the reverse direction when the rotor RPM began to drop. The pilot continued to raise collective, lost directional control and… - [NTSB NYC87LA030](https://openairdocs.org/ntsb/NYC87LA030.md): Bell 206B · Staten Island, NY · Accident · Serious injuries · Limited investigation · Final report · Nov 6, 1986 · N83086 · Substantial damage > The on-demand cargo flight encountered a bird strike enroute from new jersey to jamaica, new york. The pilot received serious injury to the eye and checkbone but was able to accomplish an emergency landing in a parking lot without further damage or injury. - [NTSB LAX86MA311](https://openairdocs.org/ntsb/LAX86MA311.md): Bell 206B · Alamo, CA · Accident · 2 fatal · Major investigation · Final report · Aug 3, 1986 · N49606 · Destroyed > Witnesses reported seeing the helicopter circle twice over a residence at an alt of aprx 50' AGL. Upon initiating the third turn the helicopter entered an abrupt 90 deg bank and nosed down to impact with the terrain. Exam of the helicopter failed to reveal… - [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 LAX86FA106](https://openairdocs.org/ntsb/LAX86FA106.md): Bell 206B · Young, AZ · Accident · 1 fatal · Field investigation · Final report · Feb 3, 1986 · N3193T · Destroyed > The plt & his daughter planned to fly to their ranch for the purpose of hiring a manager. Upon arriving at their destination ground fog prevailed. The plt, familiar with the area, attempted to find an area where he could descend below the fog. The fog was at… - [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 LAX85LA403](https://openairdocs.org/ntsb/LAX85LA403.md): Hughes 369D · Porterville, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 25, 1985 · N29707 · Destroyed > After climbing to a cruise alt of 13500 ft MSL to cross the sierra Nevada mountains, south of mt whitney, the plt entered cruise flt at an indicated airspeed of aprx 120 to 130 KTS. The plt's flt manual lists 110 KTS as the velocity velocity to never exceed… - [NTSB LAX85LA407](https://openairdocs.org/ntsb/LAX85LA407.md): Bell 206B · Pacific Ocean (Pacific Ocean) · Accident · Serious injuries · Limited investigation · Final report · Sep 17, 1985 · N2160L · Destroyed > The helicopter experienced a loss of pwr within 10 minutes after takeoff from a fishing vessel. The helicopter was ditched in the Ocean at coordinates 11.25'N and 103.37'W. Examination of fuel samples from the fishing vessel revealed both upper and lower fuel… - [NTSB FTW85LA315](https://openairdocs.org/ntsb/FTW85LA315.md): Bell 206B · Damon, TX · Accident · Minor injuries · Limited investigation · Final report · Aug 9, 1985 · N22952 · Destroyed > The plt experienced an eng deceleration to flt idle while cruising 1000 MSL. He autorotated into trees in a heavily wooded area. A subsequent eng disassembly and examination revealed the pwr control line, p/n 6848471-B, was broken at its attaching 'b' nut… - [NTSB LAX85LA282](https://openairdocs.org/ntsb/LAX85LA282.md): Bell 206B-III · Lahaina, HI · Accident · No injuries · Limited investigation · Final report · Jun 15, 1985 · N3179X · Substantial damage > The pilot reported that the engine failed at an altitude of 800 feet MSL during the climb to cruise phase of a sightseeing flight with 3 passengers on board. The acft landed in the surf of the pacific ocean and damaged the tail rotor. The pilot and passengers… - [NTSB SEA85FA104](https://openairdocs.org/ntsb/SEA85FA104.md): Hughes 369D · Spokane, WA · Accident · 2 fatal · Field investigation · Final report · May 5, 1985 · N8365F · Destroyed > The helicopter was on a flt to a tv station to transport a tv camera man & his gear. The regular plt for this trip was unable to fly, so another was retained for the flt. This was his 1st flt to the station. Helicopter operations at the tv station were… - [NTSB LAX85FA199](https://openairdocs.org/ntsb/LAX85FA199.md): Hiller UH12J3 · Klamath, CA · Accident · Serious injuries · Field investigation · Final report · Apr 12, 1985 · N545HA · Destroyed > The helicopter was returning to a private landing pad after a reconaisance flight prior to sprating. At about 10FT AGL after flaring and leveling the pilot could not control a drift and roll to the left. The rotor blades struck the ground within about one… - [NTSB SEA85LA031](https://openairdocs.org/ntsb/SEA85LA031.md): Hiller UH-12ET · Hoquiam, WA · Accident · Minor injuries · Limited investigation · Final report · Dec 18, 1984 · N100LM · Substantial damage > Plt reported that while in normal cruise flight, a total loss of power occurred. Autorotation was effected in mountainous, wooded terrain. Examination of the engine showed continuity and freedom of rotation. Examination of the fuel system disclosed no… - [NTSB SEA85LA020](https://openairdocs.org/ntsb/SEA85LA020.md): Hughes 369D · Kings Valley, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 16, 1984 · N58256 · Destroyed > The plt attempted to fly the acft away from the site of a proposed load drop before the drop was completed. The FAA inspectors said the sling did not release properly. When the plt attempted to depart the area the acft struck the groundin a nose low attitude.… - [NTSB LAX85FA036](https://openairdocs.org/ntsb/LAX85FA036.md): Bell 206B · Beaumont, CA · Accident · 2 fatal · Field investigation · Final report · Oct 31, 1984 · N20DB · Destroyed > Approximately one min before the accident the pilot contacted the tower at norton air force base for clearance through their traffic area. He reported initially that he was at 300 ft AGL. Seconds later he transmitted that he was at 100 ft over the freeway.… - [NTSB FTW84LA314](https://openairdocs.org/ntsb/FTW84LA314.md): Aerospatiale AS-355F · El Paso, TX · Accident · No injuries · Limited investigation · Final report · Jul 20, 1984 · N240US · Substantial damage > The helicopter encountered turbulence and downdrafts during landing. The acft impacted the asphalt ramp slightly nose low and bounced 2-3 ft into the air. The nose dipped more and full aft cyclic was applied. The main rotor blades hit the ground and the acft… - [NTSB LAX84FA405](https://openairdocs.org/ntsb/LAX84FA405.md): Hughes 369D · Mesa, AZ · Accident · 2 fatal · Field investigation · Final report · Jul 18, 1984 · N58369 · Destroyed > The helicopter experienced a main rotor drive system disconnect, an uncontrolled descent & subsequent inflight collision with terrain in a hilly desert area. This was the third & last in a planned series of marketing demo flts conducted for three USMC… - [NTSB SEA84LA134](https://openairdocs.org/ntsb/SEA84LA134.md): Hughes 369D · Wrangell, AK · Accident · No injuries · Limited investigation · Final report · Jun 16, 1984 · N5133U · Substantial damage > The helicopter was parked with the eng running when it was struck by another acft, a Beech C-45G. Prior to the collision, the helicopter was at a low RPM; therefore, the plt was unable to move the helicopter out of the way. The Beech acft was being taxied… Next page: https://openairdocs.org/ntsb.md?engine=03020&page=8 ## 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')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=03020&page=7 --- 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.