ASN Wikibase Occurrence # 357404
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| Date: | Tuesday 14 May 1996 |
| Time: | 09:45 LT |
| Type: | Hiller UH-12E Soloy |
| Owner/operator: | Evergreen Equity Inc |
| Registration: | N90467 |
| MSN: | 2354 |
| Total airframe hrs: | 8028 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hellam, PA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | , PA |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during the fourth aerial application pass he felt a high frequency, medium strength vibration in the tail rotor peddles. Subsequently, the helicopter lost directional and yawing control. During the emergency descent, the helicopter collided with oak trees approximately 30 to 80 feet tall. Postaccident examination revealed that the main rotor blade end caps separated from the two main rotor blades, and the outboard portions of the tail rotor blades had separated. Metallurigical examination of the main rotor blade end caps and the tail rotor blades revealed that both main rotor blade end caps exhibited damage at the leading edge. One main rotor blade end cap contained an impact mark at the leading edge and was compressed chordwise towards the trailing edge. The attachment screw holes on this main rotor blade end cap were pulled and torn. Wooden chips were entrapped in the folds of the deformed metal. All of the attachment screw holes for the other main rotor blade end cap were undamaged. Examination with the aid of a low power binocular microscope did not reveal any indication of paint transfer in the damaged areas of the tail rotor blades and main rotor caps.
Probable Cause: the pilot's loss of directional control during aerial application for undetermined reasons.
Accident investigation:
 |
|
Sources:
NTSB IAD96LA077
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 17:34 | ASN Update Bot | Added |
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