ASN Wikibase Occurrence # 76110
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Thursday 4 November 1999 |
| Time: | 11:00 LT |
| Type: |  Kaman K-1200 K-Max |
| Owner/operator: | Mountain West Helicopters, LLC |
| Registration: | N164KA |
| MSN: | 0014 |
| Year of manufacture: | 1995 |
| Total airframe hrs: | 5084 hours |
| Engine model: | Lycoming T-53-17A1 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Emida, ID -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | , ID |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after departure, during the initial climb, the helicopter experienced a sudden loss of power and the pilot initiated a forced landing to a nearby road. Post-accident inspection of the transmission assembly revealed that the splined engine adaptor was fractured due to a torsional overstress imposed on the transmission by the engine. It was determined that the adaptor fracture was secondary to another failure further along in the drive train or transmission. Further examination revealed that the helicopter's freewheeling sprag clutch assembly (located at the drive shaft input to the main transmission) exhibited signs of significant wear to include smearing, non-uniform surface wear and cam deformation. Damage or dragging in this assembly could account for the overstress fracture of the adaptor.
Probable Cause: Failure of the splined engine adaptor as a result of torsional overstress. Factors include a worn freewheeling clutch assembly.
Accident investigation:
 |
|
Sources:
NTSB SEA00FA015
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Aug-2010 08:35 | Alpine Flight | Added |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 14-Dec-2017 09:47 | ASN Update Bot | Updated [Cn, Operator, Nature, Departure airport, Destination airport, Source, Narrative] |
| 07-Apr-2024 17:04 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation