Document ID: chunk:federal_register_of_legislation:F2006B10206:body:0:p2
Version: federal_register_of_legislation:F2006B10206
Segment Type: other
Provision Reference: 
Character Range: 3002–4010

minimise loads on the horizontal stabiliser, and a modification which would constitute terminating action for the repetitive inspections.

           Amendment 4 introduced Revision 4 of the SB, which changed the effectivity to include post-mod N663 aircraft. Investigation by the manufacturer suggested that stresses in the centre section may eventually cause cracking even in aircraft modified to N663. This Revision also altered engine ground run conditions, and initial inspection and accomplishment instructions.

           Amendment 5 introduces a retirement life, and calls up Revision 8 which specifies N768 as the required terminating modification. The manufacturer's substantiation of the tailplane fatigue life is ongoing. Testing and analysis undertaken to date are not completely exhaustive in determining the final life. However, based on the information provided to the Authority, an interim life has been established. This life will be reviewed as the manufacturer's test program progresses.