ASN Wikibase Occurrence # 30522
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| Date: | Tuesday 1 June 1999 |
| Time: | 18:00 LT |
| Type: |  Robinson R22 Mariner |
| Owner/operator: | Josh Johnson |
| Registration: | N1929T |
| MSN: | 1929M |
| Total airframe hrs: | 1811 hours |
| Engine model: | Lycoming O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 35 miles W of Glennallan, Alaska -
 United States of America
|
| Phase: | Take off |
| Nature: | Unknown |
| Departure airport: | , AK (3Z5) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certificated commercial helicopter pilot reported that during a northerly departure from atop a 4,200 feet msl mountain, the rotor rpm dropped, and the low rotor warning horn sounded. He said that in an attempt to regain rotor rpm and arrest the decent, he rolled the throttle to the high position, increased collective pitch, and lowered the nose to gain airspeed. He said that the rotor rpm continued to decay, the helicopter impacted uneven terrain, and rolled over. The pilot stated: 'I just got into a downdraft on takeoff.' He added that there were no preaccident mechanical anomalies with the helicopter. The helicopter sustained substantial damage to the rotor system, and fuselage.
Probable Cause: The pilot's failure to maintain rotor RPM during takeoff. Factors associated with the accident were a downdraft, and uneven terrain.
Accident investigation:
 |
|
Sources:
NTSB ANC99LA068
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X18908&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=1929T
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 19-Dec-2011 14:56 | Dr. John Smith | Updated [Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative] |
| 11-May-2013 11:14 | Anon. | Updated [Narrative] |
| 23-Sep-2016 19:36 | Dr.John Smith | Updated [Time, Aircraft type, Operator, Location, Nature, Departure airport, Source, Narrative] |
| 14-Dec-2017 08:29 | ASN Update Bot | Updated [Time, Cn, Operator, Total occupants, Nature, Departure airport, Source, Damage, Narrative] |
| 08-Apr-2024 05:46 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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