ASN Wikibase Occurrence # 145765
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| Date: | Sunday 20 May 2012 |
| Time: | 09:00 |
| Type: |  Enstrom F-28F Falcon |
| Owner/operator: | Private |
| Registration: | N63VP |
| MSN: | 812 |
| Total airframe hrs: | 1593 hours |
| Engine model: | Lycoming HIO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Joslin Field/Magic Valley (KTWF), Twin Falls, ID -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Elko, NV (EKO) |
| Twin Falls, ID (TWF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that on a previous flight, he encountered an uncommanded roll, so he checked the three main rotor Lamiflex bearings prior to departure. He said one bearing showed no indication of a pending failure, the second showed some indication of approaching failure, and the third showed a minor indication that it was beginning to fail. From past experience, the pilot said that he believed that he still had several hours before the bearings would fail and that he could safely proceed with the flight. A few miles from the intended destination, a vibration started and became progressively worse to the point where the pilot was losing control of the helicopter. The pilot subsequently made what he described as a “controlled crash landing,” which resulted in substantial damage to the helicopter. A postaccident examination revealed that the No. 2 main rotor Lamiflex bearing failed, which resulted in the loss of control. A review of maintenance logbooks found that the helicopter was not in compliance with either its annual inspection requirement or with FAA Airworthiness Directive 94-17-15, which required repetitive inspections of the helicopter’s main rotor Lamiflex bearings.
Probable Cause: The pilot's inability to maintain helicopter control during cruise flight due to the failure of the No. 2 main rotor Lamiflex bearing. Contributing to the accident was the pilot's decision to operate the helicopter with a known deficiency and the helicopter’s noncompliance with the mandatory scheduled inspection of the main rotor bearings.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-May-2012 06:55 | gerard57 | Added |
| 21-May-2012 07:28 | harro | Updated [Aircraft type] |
| 21-May-2012 08:23 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Location, Phase, Destination airport, Narrative] |
| 21-May-2012 08:25 | RobertMB | Updated [Narrative] |
| 22-May-2012 13:29 | Geno | Updated [Location, Departure airport, Source, Narrative] |
| 30-Apr-2013 14:53 | TB | Updated [Operator, Location, Destination airport, Source, Narrative] |
| 30-Apr-2013 15:01 | TB | Updated [Location] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 20:41 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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