# NTSB investigations: Lycoming VO-540 series: 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 LAX03LA197](https://openairdocs.org/ntsb/LAX03LA197.md): Bell 47-G4 · Porterville, CA · Accident · 1 fatal · Limited investigation · Final report · Jun 13, 2003 · N9017N · Destroyed > loss of control for undetermined reasons. - [NTSB FTW02LA186](https://openairdocs.org/ntsb/FTW02LA186.md): Bell 47G4 · Grand Lake, LA · Accident · Minor injuries · Limited investigation · Final report · Jun 23, 2002 · N62446 · Destroyed > the pilot's inability to control the helicopter in a hover due to the restricted movement of the cyclic for undetermined reasons. - [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 LAX98LA197](https://openairdocs.org/ntsb/LAX98LA197.md): Bell 47G-4A · Shafter, CA · Accident · No injuries · Limited investigation · Final report · Jun 14, 1998 · N110DT · Substantial damage > The aircraft's encounter with settling with power, which resulted from the pilot's decision to perform a steep downwind approach. - [NTSB FTW98LA030](https://openairdocs.org/ntsb/FTW98LA030.md): Bell 47G-4A · Welsh, LA · Accident · No injuries · Limited investigation · Final report · Oct 16, 1997 · N7104J · Substantial damage > the pilot's failure to maintain control of the helicopter, while maneuvering to avoid an obstruction. The abrupt maneuver was a related factor. - [NTSB FTW96LA005](https://openairdocs.org/ntsb/FTW96LA005.md): Bell 47G-4A · Edinburg, TX · Accident · Minor injuries · Limited investigation · Final report · Oct 3, 1995 · N6SR · Substantial damage > the pilot's improper takeoff planning which resulted in the loss of conrol. A factor was the gusty crosswind condition. - [NTSB FTW95LA105](https://openairdocs.org/ntsb/FTW95LA105.md): Bell 47G-4A · El Indio, TX · Accident · Minor injuries · Limited investigation · Final report · Feb 1, 1995 · N6SR · Destroyed > The loss of tail rotor effectiveness. A factor was the gusty right quartering tailwind. - [NTSB LAX92LA396](https://openairdocs.org/ntsb/LAX92LA396.md): Bell 47-G4A · Volcano, HI · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 1992 · N73279 · Substantial damage > The pilot's improper use of the collective control after inadvertently entering a power settling condition. - [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 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 DEN85LTG06](https://openairdocs.org/ntsb/DEN85LTG06.md): Bell 47G-4A · Minot, ND · Accident · No injuries · Final report · Jul 30, 1985 · N1041B · Substantial damage > The plt was engaged by a deputy sheriff to fly the helicopter about 2-1/2 mi to the Minot intl arpt for impoundment. During takeoff, it began climbing, then the plt lost control & the helicopter entered a descent & crashed. Initial impact occurred about 35 ft… - [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.engine_model_code IN ('41534', '41582') 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?engine=41534&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.