ASN Wikibase Occurrence # 66711
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| Date: | Wednesday 29 July 2009 |
| Time: | 11:00 |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Hillsboro Aviation Inc |
| Registration: | N7176W |
| MSN: | 2735 |
| Year of manufacture: | 1997 |
| Total airframe hrs: | 6135 hours |
| Engine model: | Lycoming O-360-A1D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Location: | Portland-Troutdale Airport, Troutdale, 10nm E of Portland, Oregon -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Portland-Troutdale Airport, Troutdale, Oregon (TTD/KTTD) |
| Portland-Troutdale Airport, Troutdale, Oregon (TTD/KTTD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After practising a series of auto rotations, the flight instructor and his student attempted to complete a 180-degree auto rotation. The student began a stabilised auto rotation from the downwind leg of the traffic pattern. According to the flight instructor, during the turn the student allowed the nose of the helicopter to drop; he was instructed to correct this attitude by applying aft cyclic. When the student completed the turn at an altitude of 200 to 250 ft agl and at a speed of 80 to 85 knots, the flight instructor believed that the outcome of the maneuver was in doubt.
The flight instructor then took control of the helicopter and began to initiate a recovery by raising the nose and attempting to increase the throttle and collective to arrest the descent rate. According to the flight instructor, the RPM decayed and the low rotor rpm horn came on at 150 to 100 feet agl. The helicopter landed hard and subsequently slid off the north side of the taxiway.
The forward section of the left skid contacted the soft dirt, which resulted in the helicopter turning to the left and nosing over. Examination of the aircraft by a Federal Aviation Administration inspector revealed substantial damage to the helicopter consisted of the separation of the tail boom assembly, damage to the firewall, the left forward frame, and left skid support structure.
The flight instructor reported no mechanical anomalies with the helicopter or flight control systems.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows: The flight instructor's failure to maintain adequate main rotor RPM.
Accident investigation:
 |
|
Sources:
NTSB
2. FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7176W
3. http://helihub.com/2009/07/29/29-jul-09-n7176w-robinson-r22-troudale-us-oregon/
4. https://www.kptv.com/news/20215925/detail.html
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Jul-2009 10:38 | slowkid | Added |
| 03-Oct-2016 19:46 | Dr.John Smith | Updated [Location, Departure airport, Destination airport, Source, Narrative] |
| 03-Oct-2016 19:49 | Dr.John Smith | Updated [Damage, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 02-Dec-2017 15:47 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
| 25-Sep-2018 00:22 | Dr.John Smith | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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