# NTSB investigations: Hughes 269C: Airframe/component/system failure/malfunction 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 FTW98TA104](https://openairdocs.org/ntsb/FTW98TA104.md): Hughes 269C · Brackettville, TX · Accident · Minor injuries · Final report · Jan 22, 1998 · N1093N · Substantial damage > failure of splines on the drive shaft coupling after separation of the forward bubber boot and loss of lubrication (grease), which resulted in a disconnect of the rotor drive system and an autorotation/forced landing. Lack of suitable terrain in the forced… - [NTSB IAD97LA028](https://openairdocs.org/ntsb/IAD97LA028.md): Hughes 269C · Mayfield, KY · Accident · No injuries · Limited investigation · Final report · Dec 4, 1996 · N1105P · Substantial damage > disengagement of the main transmission aft pinion nut, allowing the tail rotor splined drive sleeve to disengage from the pinion, which resulted in loss of directional control and an emergency (autorotative) landing. - [NTSB CHI95LA029](https://openairdocs.org/ntsb/CHI95LA029.md): Hughes 269C · Garden City, KS · Accident · No injuries · Limited investigation · Final report · Nov 2, 1994 · N9294F · Substantial damage > inadvertant engagement of the rotor drive system, while the helicopter had been left unattended by the pilot. - [NTSB BFO92FA144](https://openairdocs.org/ntsb/BFO92FA144.md): Hughes 269C · East Bernstadt, KY · Accident · 2 fatal · Field investigation · Final report · Sep 25, 1992 · N9609F · Destroyed > Inadequate maintenance inspection involving failure to detect wear of the clutch spring assembly, resulting in the uncoupling of engine power to the main transmission. - [NTSB CHI91LA097](https://openairdocs.org/ntsb/CHI91LA097.md): Hughes 269C · North Mankato, MN · Accident · Serious injuries · Limited investigation · Final report · Feb 20, 1991 · N8955F · Destroyed > The fatique failure of the tail boom support strut attachment cluster and the improper inspection of the cluster attachment. - [NTSB BFO90FA079](https://openairdocs.org/ntsb/BFO90FA079.md): Hughes 269C · Jefferson, MD · Accident · 1 fatal · Field investigation · Final report · Sep 25, 1990 · N1094D · Destroyed > The failure of the tail rotor drive transmission system due to a worn tail rotor splined drive sleeve, and inadequate maintenance and/or inspection by the operator. Contributing to the loss of control was the student pilot's failure to maintain adequate rotor… - [NTSB LAX90LA187](https://openairdocs.org/ntsb/LAX90LA187.md): Hughes 269C · Rialto, CA · Accident · No injuries · Limited investigation · Final report · May 23, 1990 · N7441F · Substantial damage > Improper maintenance procedure by maintenance personnel to troubleshoot a reported deficiency and the pilot's decision to demonstrate the vibration, exceeding the design limits of the helicopter and inducing ground resonance. Contributing to the accident was… - [NTSB FTW89LA010](https://openairdocs.org/ntsb/FTW89LA010.md): Hughes 269C · Dickens, TX · Accident · No injuries · Limited investigation · Final report · Oct 27, 1988 · N7463F · Destroyed > The pilot was inspecting a herd of cattle when he thought the helicopter was developing a problem with the engine and main rotor. He started an autorotation, lost tail rotor control, and went into a left spin which continued to contact with the ground.… - [NTSB LAX88FA249](https://openairdocs.org/ntsb/LAX88FA249.md): Hughes 269C · Van Nuys, CA · Accident · Minor injuries · Field investigation · Final report · Jul 9, 1988 · N750AM · Substantial damage > Flight with undertorqued rotor dampers. - [NTSB SEA88LA073](https://openairdocs.org/ntsb/SEA88LA073.md): Hughes 269C · Sitka, AK · Accident · No injuries · Limited investigation · Final report · Apr 12, 1988 · N92PC · Substantial damage > During sling operations, the long line became separated and entangled in the tail rotor at about 300 feet AGL. The pilot landed the helicopter onto a beach area where it rolled over onto its left side striking the main rotor. No accident report has been filed… - [NTSB ATL87LA040](https://openairdocs.org/ntsb/ATL87LA040.md): Hughes 269C · Charlotte, NC · Accident · No injuries · Limited investigation · Final report · Dec 10, 1986 · N58188 · Substantial damage > While flying at 300' to 500' AGL on a cable patrol flt, the plt heard a loud loise. The rotor RPM started to decay & the eng RPM increased sharply. The plt initiated an autorotation to a parking lot, but had to maneuver to avoid trees & a vehicle. The… - [NTSB ATL86FA218](https://openairdocs.org/ntsb/ATL86FA218.md): Hughes 269C · Laurens, SC · Accident · No injuries · Field investigation · Final report · Aug 11, 1986 · N7442F · Destroyed > The plt was flying an underground cable patrol at 500-600 ft AGL when the accident occurred. The plt reported pwr was set at 20' hg, 3,000 RPM when a 'very loud pop' was heard. The plt likened the sound to being hit by ground fire. The acft yawed and the eng… - [NTSB SEA85LA079](https://openairdocs.org/ntsb/SEA85LA079.md): Hughes 269C · Elma, WA · Accident · No injuries · Limited investigation · Final report · Mar 20, 1985 · N9592F · Substantial damage > Just prior to lift-off a vibration accompanied by lateral rocking occurred. Although the plt brought the power to idle. The helicopter had already started to come apart. During engine examination it was found that the ground resonance occurred due to under to… - [NTSB MKC83LA187](https://openairdocs.org/ntsb/MKC83LA187.md): Hughes 269C · Dodge City, KS · Accident · No injuries · Limited investigation · Final report · Aug 12, 1983 · N7412F · Substantial damage > After dispensing a load of chemicals, the plt was returning to land when he felt a vibration in the tail boom. This was followed by a loud noise & the helicopter began turning. The plt lowered the collective & the power. Subsequently, the helicopter landed… - [NTSB CHI82DA149](https://openairdocs.org/ntsb/CHI82DA149.md): Hughes 269C · Flint, MI · Accident · No injuries · Final report · May 3, 1982 · N8963F · Substantial damage > The aircrew were on an instructional flight to prepare the student, a rated pilot, for a flight instructor rating. After practicing several autorotation approaches, the helicopter was landed. The instructor pilot (ip) stated that after touchdown, he and the… ## 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 ('4470504') 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" = 130)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?model=4470504&occurrence=130 --- 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.