ASN Wikibase Occurrence # 30307
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| Date: | Saturday 18 December 1999 |
| Time: | 14:30 LT |
| Type: |  Hughes 269A |
| Owner/operator: | Brown Helicopter Services |
| Registration: | N575PF |
| MSN: | 121-0033 |
| Total airframe hrs: | 5809 hours |
| Engine model: | Lycoming HIO-360-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Brownsboro, Texas -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Flint, TX (NONE) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Prior to the accident, the helicopter was flying on an easterly heading in level flight at approximately 20 knots while making shallow turns following a creek bed. The pilot reported that the helicopter lost all of its lift and power and started descending toward the trees. The pilot added that the anti-torque pedals were ineffective and the helicopter was spinning to the right prior to impact with the trees. Minor repairs were made to the engine in order to run the engine on the helicopter. The engine was started and operated twice within the 1300 to 2500 RPM range for 18 minutes. A representative of the engine manufacturer reported 'no pre-existing engine deficiencies were noted and the investigation did not produce any evidence that the engine was not capable of operating and producing power at the time of the accident.' The conditions at the time of the accident were found to be conducive to the formation of a tail rotor vortex ring state.
Probable Cause: The loss of tail rotor effectiveness as a result of tail rotor vortex ring state.
Accident investigation:
 |
|
Sources:
NTSB FTW00LA048
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X20243&key=1
FAA register: 2. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=575PF
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 29-Nov-2014 00:02 | Dr. John Smith | Updated [Time, Aircraft type, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative] |
| 29-Nov-2014 00:04 | Dr. John Smith | Updated [Operator, Nature] |
| 14-Dec-2017 10:01 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Source, Damage, Narrative] |
| 07-Apr-2024 16:09 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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