ASN Wikibase Occurrence # 202392
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| Date: | Thursday 30 November 2017 |
| Time: | 15:35 LT |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Tumbleweed Leasing Co Inc |
| Registration: | N47WH |
| MSN: | 3525 |
| Year of manufacture: | 2003 |
| Total airframe hrs: | 219 hours |
| Engine model: | Lycoming O-360-J2A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Truckee-Tahoe Airport (TRK/KTRK), CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Truckee, CA |
| Truckee, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor was demonstrating an autorotation with a 180° left turn at a density altitude of about 6,470 ft. He entered the maneuver from 700 ft above ground level (agl) and about 80 kts indicated airspeed, established engine rpm, and started the 180° turn. About 1/3 of the way through the turn, he felt he needed a 'desirable' speed through the turn and moved the cyclic forward and adjusted the collectively accordingly. The flight instructor stated that when he should have been 2/3 through the turn, he felt that he did not have the cyclic and collective control of the helicopter and he knew they were going to crash. He further stated that he continued 'teaching,' and called out 'rpm, airspeed, and outside,' while pointing to the tachometer, airspeed indicator, and intended landing spot; he also made control inputs and continued to fly what 'had become an unresponsive aircraft.' He also stated that there was no flare at the end of the autorotation and no time for an engine rpm recovery.
Postaccident examination of the airframe and engine revealed no mechanical anomalies that would have precluded normal operation.
The helicopter manufacturer's Safety Notice SN-38 stated that if any of the parameters for rotor rpm, a stabilized airspeed, a stabilized rate of descent or turns (if any) completed are not correct, an immediate power recovery should be initiated; salvaging the situation by coaching the student or trying to correct below 100 ft agl (200 ft when operating at or above 4000 ft density altitude) should not be attempted. Had the flight instructor aborted the autorotation early on, it is likely he would have regained helicopter control.
Probable Cause: The flight instructor's failure to execute a power recovery from a non-stabilized autorotative descent, which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB WPR18LA041
FAA register: 2. FAA http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=47WH
8. https://uk.flightaware.com/resources/registration/N47WH
History of this aircraft
Other occurrences involving this aircraft
| 16 July 2012 | N47WH | Upper Limit Aviation | 0 | Skypark Airport, Woods Cross, Bountiful, Utah | |
sub |
| Heavy landing | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Dec-2017 10:29 | gerard57 | Added |
| 01-Dec-2017 10:34 | Aerossurance | Updated [Time, Aircraft type, Location] |
| 01-Dec-2017 16:27 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Location, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 01-Dec-2017 17:44 | Anon. | Updated [Operator] |
| 01-Dec-2017 17:47 | harro | Updated [Operator] |
| 14-Jul-2018 21:29 | Dr. John Smith | Updated [Time, Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative] |
| 06-Mar-2022 23:50 | Captain Adam | Updated [Location, Departure airport, Destination airport, Source] |
| 02-Jul-2022 18:36 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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