Document ID: chunk:federal_register_of_legislation:F2007L01446:body:0:p2
Version: federal_register_of_legislation:F2007L01446
Segment Type: other
Provision Reference: 
Character Range: 2957–3629

The EASA received a report of a crack in the area of the centre cross-member at station X 2325, at the attachment point of the yaw channel ball-type control sheath stop of a Model AS 355 N helicopter fitted with the collective-to-yaw control coupling.  Investigation revealed that the helicopter was not equipped with the structure doublers, which are combined with the collective-to-yaw control coupling installation.  Repetitive overloads on the non-modified cross member will cause it to crack, and result in reduction of yaw control travel with consequent reduced yaw control for the pilot.

David Punshon
Delegate of the Civil Aviation Safety Authority

16 May 2007