ASN Wikibase Occurrence # 356650
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| Date: | Monday 23 September 1996 |
| Time: | 18:00 LT |
| Type: | Kaman HH-43 B/F |
| Owner/operator: | Skyline Helicopters |
| Registration: | N4069R |
| MSN: | 64-17558 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 7587 hours |
| Engine model: | Lycoming T53-L13B |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Troy, MT -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | , MT |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that while in cruise flight, the internal autorotation cockpit gauge needles split, and the helicopter lost altitude. The rotor rpm was decreasing, and the pilot initiated an autorotation. During the descent, the pilot noted that the N1 gauge indicated that the engine was running, but there was no power to the rotor. The helicopter landed hard, which drove the landing gear through the belly and separated the tail boom. A postaccident investigation revealed that bearings in the one-way freewheeling sprag clutch had failed. The one-way clutch was not a time-retireable item, and determining total time of the assembly from the maintenance records was not possible.
Probable Cause: failure of the freewheeling sprag unit bearings for undetermined reasons.
Accident investigation:
 |
|
Sources:
NTSB SEA96LA219
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 09:26 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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