ASN Wikibase Occurrence # 89827
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| Date: | Thursday 3 February 2011 |
| Time: | 17:20 |
| Type: |  Robinson R44 |
| Owner/operator: | Whirlybird Helicopters LLC |
| Registration: | N441TB |
| MSN: | 0631 |
| Year of manufacture: | 1999 |
| Total airframe hrs: | 1676 hours |
| Engine model: | Lycoming O-540-F1B5 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 10 miles NW of Ogden-Hinckley Airport UT -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Ogden, UT (OGD) |
| Ogden, UT (OGD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After completing several practice landings and autorotations at the airport, the certified flight instructor (CFI) and student pilot departed for the practice area. The CFI demonstrated straight-in and 180-degree autorotations; the first 180-degree attempt began at 6,000 feet mean sea level and at 55-60 knots. During the second 180-degree attempt, he started about 200 feet lower. The airspeed bled off to about 50 knots during the turn, and the main rotor blades’ rpms began decaying rapidly. About 200 feet above ground level the CFI attempted a power recovery, but the rpms did not increase with an increase in throttle. He unsuccessfully attempted to flair to bring the rpms back before attempting a full down autorotation. He put the helicopter in a level attitude prior to contact with the ground and the helicopter bounced upon initial contact; on the second contact, the right skid dug into the muddy ground and the helicopter rolled onto its right side. The helicopter sustained substantial damage to the airframe and rotor blades. The pilots stated that the helicopter had no mechanical failures or malfunctions prior to the accident.
Probable Cause: The certified flight instructor’s failure to maintain adequate main rotor blade rpm during a practice autorotation, resulting in a hard landing and rollover.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=441TB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Feb-2011 02:59 | gerard57 | Added |
| 04-Feb-2011 08:01 | bizjets101 | Updated [Aircraft type, Cn, Operator, Location, Source] |
| 04-Feb-2011 08:01 | bizjets101 | Updated [Registration] |
| 30-Sep-2016 17:16 | Aerossurance | Updated [Aircraft type, Location, Nature, Source, Damage, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 16:43 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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