ASN Wikibase Occurrence # 356435
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| Date: | Wednesday 4 December 1996 |
| Time: | 17:35 LT |
| Type: |  Hughes 269C |
| Owner/operator: | Private |
| Registration: | N1105P |
| MSN: | 211028 |
| Total airframe hrs: | 8640 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mayfield, KY -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Henning, TN |
| Indianapolis, IN (I21) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that the purpose of the flight was to ferry the helicopter. The helicopter had been cruising at 1,200 feet MSL for over an hour, when the nose started to yaw to the right. Unable to control the yaw, the pilot entered an autorotation at about 70 mph to a field. During the forced landing, the helicopter collided with a fence. Examination of the helicopter revealed that the aft pinion nut of the main transmission had disengaged, which allowed the tail rotor splined drive sleeve to disengage from the pinion and tail rotor drive shaft. Investigation did not determined why the aft pinion backed off. The last annual inspection was completed on 6/7/96. The helicopter had accumulated 66 hours of flight time, since the annual inspection.
Probable Cause: disengagement of the main transmission aft pinion nut, allowing the tail rotor splined drive sleeve to disengage from the pinion, which resulted in loss of directional control and an emergency (autorotative) landing.
Accident investigation:
 |
|
Sources:
NTSB IAD97LA028
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 07:09 | ASN Update Bot | Added |
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