ASN Wikibase Occurrence # 30498
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| Date: | Tuesday 6 July 1999 |
| Time: | 16:45 LT |
| Type: |  Bell OH-58A Kiowa |
| Owner/operator: | New Jersey State Police |
| Registration: | N4NJ |
| MSN: | 51170 |
| Year of manufacture: | 1986 |
| Total airframe hrs: | 2922 hours |
| Engine model: | Allison 250-C-30P |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Woodbridge, New Jersey -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | West Trenton, NJ |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot took off into the wind to conduct a high orbit, and as the pilot 'gently and smoothly' started a right turn, an uncommanded right yaw, along with a 'high engine whine sound,' was experienced. At that time the pilot estimated the wind was at his 10 o'clock position. The pilot immediately applied left pedal to compensate for the right yaw, but it did not arrest the rotation. The collective was then lowered, and in an attempt to fly out of the ensuing condition, the helicopter was turned into the direction of rotation. After the helicopter made three complete 360-degree turns to the right, the PIC closed the throttle to idle, and performed an autorotation to a dry lakebed. FAA Advisory Circular 90-95 stated that 'Any maneuver which requires the pilot to operate in a high-power, low airspeed environment with a left crosswind or tailwind creates an environment where unanticipated right yaw may occur.' The AC also advised of greater susceptibility for LTE in right turns and the phenomena may occur in varying degrees in all single main rotor helicopters at airspeeds less than 30 knots.
Probable Cause: The pilot's improper takeoff procedure, which resulted in a loss of tailrotor effectiveness.
Accident investigation:
 |
|
Sources:
NTSB NYC99FA169
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X19329&key=1
FAA register: 2. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=4NJ
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 10-Apr-2015 19:15 | Dr. John Smith | Updated [Date, Time, Aircraft type, Registration, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Source, Damage, Narrative] |
| 14-Dec-2017 08:44 | ASN Update Bot | Updated [Time, Cn, Nature, Departure airport, Source, Damage, Narrative] |
| 07-Apr-2024 19:24 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Source, Narrative, Accident report] |
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