Document ID: chunk:federal_register_of_legislation:F2009L00830:body:0:p2
Version: federal_register_of_legislation:F2009L00830
Segment Type: other
Provision Reference: 
Character Range: 2818–3662

was due to an incorrect adjustment.

   If the damping system is incorrectly adjusted, torque oscillations may not be limited and can induce bending stress on the 41-tooth pinion of the accessory gear box, contributing to the pinion failure.  Such pinion failure causes the fuel pump to stop which results in an engine flame-out.

   Pending additional investigations, this AD required an inspection of the alignment and torque of the APC starter-generator damping assembly and, in case of discrepancies, the accomplishment of corrective actions.

   This amendment supersedes the original requirements of this AD, and now requires a new adjustment procedure which has proven to be more reliable and optimizes the performance of the APC starter-generator assembly.

James Coyne
Delegate of the Civil Aviation Safety Authority

2 March 2009