ASN Wikibase Occurrence # 360213
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| Date: | Thursday 7 July 1994 |
| Time: | 12:25 LT |
| Type: |  Robinson R-22M |
| Owner/operator: | Hillsboro Helicopters, Inc. |
| Registration: | N42WC |
| MSN: | 1531M |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 460 hours |
| Engine model: | LYCOMING O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Portland, OR -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Training |
| Departure airport: | Hillsboro, OR (KHIO) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT ATTEMPTED AN AUTOROTATION AFTER LOSS OF TAIL ROTOR EFFECTIVENESS. THE TAIL BOOM AND ROTOR STRUCK THE SURFACE WHEN THE FLOAT EQUIPPED HELICOPTER LANDED IN THE RIVER. INVESTIGATION REVEALED THAT THE TAIL ROTOR GEARBOX OUTPUT SHAFT PINION RETAINING KEY HAD NOT BEEN INSTALLED DURING ASSEMBLY. THE TAIL ROTOR HUB AND BLADE ASSEMBLY WERE FREE TO TURN ON THE SHAFT AT THE TIME OF INVESTIGATION.
Probable Cause: TAIL ROTOR GEARBOX FAILURE DUE TO INADEQUATE ASSEMBLY AND INSPECTION PROCEDURES BY THE MANUFACTURER.
Accident investigation:
 |
|
Sources:
NTSB SEA94LA171
History of this aircraft
Other occurrences involving this aircraft
| 27 July 2022 | N42WC | N42WC LLC | 0 | North Perry Airport (HWO/KHWO), Hollywood, FL | |
sub |
| Loss of control | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 19:04 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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