# NTSB investigations: Hiller UH-12E: Loss of control - in flight 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 CHI01LA238](https://openairdocs.org/ntsb/CHI01LA238.md): Hiller UH-12E · Hastings, NE · Accident · No injuries · Limited investigation · Final report · Jul 25, 2001 · N67067 · Substantial damage > Aircraft control not being maintained by the pilot which resulted in the encountered settling with power flight condition during the initial climb. Factors to the accident were the reported variable winds during the takeoff and the corn crop. - [NTSB CHI98LA218](https://openairdocs.org/ntsb/CHI98LA218.md): Hiller UH-12E · Park Rapids, MN · Accident · No injuries · Limited investigation · Final report · Jun 24, 1998 · N86663 · Substantial damage > the pilot's failure to maintain control of aircraft. Factors were the congested helipad conditions and wind gusts. - [NTSB IAD96LA077](https://openairdocs.org/ntsb/IAD96LA077.md): Hiller UH-12E · Hellam, PA · Accident · Minor injuries · Limited investigation · Final report · May 14, 1996 · N90467 · Substantial damage > the pilot's loss of directional control during aerial application for undetermined reasons. - [NTSB SEA95LA077](https://openairdocs.org/ntsb/SEA95LA077.md): Hiller UH-12E · Timber, OR · Accident · Serious injuries · Limited investigation · Final report · Apr 11, 1995 · N508HV · Substantial damage > The pilot's inadequate aircraft preflight during which he failed to notice the main rotor shipping block had not been removed, and the resultant restricted movement of the flight control system. - [NTSB CHI93DTK02](https://openairdocs.org/ntsb/CHI93DTK02.md): Hiller UH-12E · Milbank, SD · Accident · Minor injuries · Final report · Jul 18, 1993 · N4028M · Destroyed > Undetermined - [NTSB FTW92LA007](https://openairdocs.org/ntsb/FTW92LA007.md): Hiller UH-12E · Palacios, TX · Accident · No injuries · Limited investigation · Final report · Oct 11, 1991 · N4029D · Substantial damage > The pilot's inadequate preflight. - [NTSB DEN89LA084](https://openairdocs.org/ntsb/DEN89LA084.md): Hiller UH-12E · Golden, CO · Accident · No injuries · Limited investigation · Final report · Mar 9, 1989 · N7411N · Substantial damage > Improper in-flight planning/decision by the CFI which resulted in loss of tail rotor effectiveness and loss of directional control. Contributing factors were high density altitude, tailwind, and rough/uneven terrain. - [NTSB LAX88DVA16](https://openairdocs.org/ntsb/LAX88DVA16.md): Hiller UH-12E · Helm, CA · Accident · Minor injuries · Final report · Sep 10, 1988 · N4029Y · Substantial damage > During an aerial application flight, the pilot lost control of the helicopter just after liftoff and collided with the terrain. Inspection of the wreckage revealed that the chemical trucks filler hose was still attached to the helicopter when it lifted off. - [NTSB MKC87LA145](https://openairdocs.org/ntsb/MKC87LA145.md): Hiller 12E · Ulysess, KS · Accident · Minor injuries · Limited investigation · Final report · Jul 23, 1987 · N67139 · Substantial damage > During a helicopter aerial application operation, acft suffered a main rotor system hub failure. PIC was unable to control the acft and an uncontrolled descent resulted. Acft struck the terrain and was substantially damaged and the PIC suffered minor… - [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 DEN84LA177](https://openairdocs.org/ntsb/DEN84LA177.md): Hiller UH-12E · Granby, CO · Accident · No injuries · Limited investigation · Final report · Jun 11, 1984 · N504HA · Substantial damage > The helicopter plt was on a reconnaissance flt to survey a hilltop landing site in mountainous terrain. When he arrived, he made a high reconnaissance pass, then began a low reconnaissance apch. He estimated the wind was from 210 deg at 10 to 15 KTS with… - [NTSB LAX84LA010](https://openairdocs.org/ntsb/LAX84LA010.md): Hiller UH12E · Los Banos, CA · Accident · No injuries · Limited investigation · Final report · Oct 10, 1983 · N4026G · Substantial damage > The plt loaded the helicopter & started a spraying operation. He stated that as he pulled the helicopter up from the 1st spray run, it started shaking & went partially out of control. He was able to regain enough control to get the helicopter in level flt… ## 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.aircraft_model_code IN ('4360122', '4360137') 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" = 250)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?model=4360122&occurrence=250 --- 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.