Tail rotor failure — Robinson R44, hover

Summary

A Robinson R44 Raven II experienced a sudden loss of tail rotor control while hovering at approximately 15 ft AGL during a pipeline inspection. The aircraft yawed rapidly to the right, the pilot attempted recovery, and the aircraft struck the ground in a rolling motion. The pilot sustained minor injuries; the aircraft was substantially damaged.

Investigation Findings (4)

1. 01Post-accident inspection found a fractured tail rotor pitch link rod end.
2. 02Fracture analysis indicated corrosion-assisted fatigue originating at the rod end threads.
3. 03The rod end had been installed for 320 hours, within its 500-hour replacement interval.
4. 04Robinson Helicopter Company and CASA reduced the rod end replacement interval from 500 to 300 hours as a safety action.