ASN Wikibase Occurrence # 151249
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| Date: | Saturday 15 December 2012 |
| Time: | 13:45 |
| Type: |  Robinson R22 Beta II |
| Owner/operator: | Mountain Ridge Helicopters LLC |
| Registration: | N393LE |
| MSN: | 4393 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 3007 hours |
| Engine model: | Lycoming O-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Location: | Logan-Cache Airport, 3 miles NW of Logan, Cache County, Utah -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Logan-Cache Airport, Logan, Utah (LGU/KLGU) |
| Logan-Cache Airport, Logan, Utah (LGU/KLGU) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the 180-degree autorotation, the student pilot maintained an airspeed of 65 knots, with rotor rpm in the green. As the student rolled out of the turn about 300 feet above ground level and at 70 knots, the rotor rpm continued to remain in the green. However, before the flare, the rotor rpm began to decay and failed to build as the flare was entered. The flight instructor then took control of the helicopter and immediately rolled on throttle to recover engine power and to maintain rotor rpm, but there was insufficient engine power to recover, and the low rotor rpm light and horn activated. Because power was not available for a full-power-on landing, the flight instructor initiated a full-down auto rotation to a taxiway. During the landing, the helicopter skidded across and off the wet taxiway into loose gravel and mud before the left skid dug into the ground, resulting in the helicopter rolling over and coming to rest on its left side. The helicopter sustained substantial damage to its welded frames, firewall, and tail cone. The flight instructor reported no pre accident mechanical or malfunctions or failures with the helicopter or flight controls that would have precluded normal operation.
Probable Cause: The flight instructor’s delayed remedial action and inadequate supervision during a practice auto rotation, which resulted in a failure to maintain adequate main rotor rpm. Contributing to the accident was the wet landing surface.
Helicopter presumably written off as Damaged beyond economic repair, as the registration N393LE was cancelled by the FAA on July 16 2013
Accident investigation:
 |
|
Sources:
NTSB
2. FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=393LE
3. http://helihub.com/2012/12/15/15-dec-12-robinson-r22-logan-cache-airport-us-utah/
4. http://archive.sltrib.com/article.php?id=55473113&itype=CMSID
5. https://www.hjnews.com/news/article_a039aa72-46fc-11e2-861d-001a4bcf887a.html
6. https://fox13now.com/2012/12/15/helicopter-makes-bad-landing-at-logan-cache-airport/
7. https://prijet.com/accident/20121215X11534
8. https://en.wikipedia.org/wiki/Logan-Cache_Airport
History of this aircraft
Other occurrences involving this aircraft
| 7 May 2010 | N393LE | Mountain Ridge Helicopters LLC | 0 | Bud Phelps Wildlife Management Area, near Mendon, Utah | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Dec-2012 05:37 | gerard57 | Added |
| 16-Dec-2012 05:39 | harro | Updated [Aircraft type] |
| 16-Dec-2012 10:57 | Geno | Updated [Time, Aircraft type, Operator, Location, Departure airport, Destination airport, Source, Damage, Narrative] |
| 18-Dec-2012 15:52 | Geno | Updated [Registration, Cn, Source] |
| 11-Oct-2016 14:33 | Dr.John Smith | Updated [Time, Location, Departure airport, Destination airport, Source, Narrative] |
| 11-Oct-2016 14:36 | Dr.John Smith | Updated [Location, Source] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:01 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
| 25-Aug-2018 00:11 | Dr.John Smith | Updated [Operator, Other fatalities, Location, Departure airport, Destination airport, Source, Narrative] |
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