ASN Wikibase Occurrence # 296548
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| Date: | Monday 7 October 2002 |
| Time: | 17:30 LT |
| Type: |  RotorWay Exec 162F |
| Owner/operator: | |
| Registration: | N1955Z |
| MSN: | 6365 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Gregory, Michigan -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Howell-Livingston County Spencer J. Hardy Airport, MI (KOZW) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight, the secondary drive shaft failed completely and power to the main rotor was lost. The pilot executed an autorotation to an open field. However, on landing, the forward speed was higher than planned and the helicopter flipped forward and rolled to the left. The pilot stated that on his return to the airport, the secondary shaft bearing temperature started to rise. Once the bearing temperature reached 150 degrees Fahrenheit, the "drive let go", causing the engine RPM to surge. A post-accident inspection revealed that the secondary shaft had failed at a point inside the upper bearing race. Due to a history of failures of this secondary shaft design, Rotorway had released a 35 mm diameter shaft configuration in April 2001. The preceeding shaft diameter was 30 mm. An advisory bulletin was issued by Rotorway in May 2002. The 30 mm configuration was installed on the accident aircraft. In addition, the accident aircraft incorporated an after-market cog belt drive system between the secondary shaft and the main rotor shaft. The basic Rotorway design utilizes a chain drive system.
Probable Cause: Failure of the secondary drive shaft, which resulted in a complete loss of power to the main rotor, and a high forward airspeed on touchdown, causing the helicopter to flip forward.
Accident investigation:
 |
|
Sources:
NTSB CHI03LA006
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 07:53 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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