Document ID: chunk:federal_register_of_legislation:F2006B02540:body:0:p2
Version: federal_register_of_legislation:F2006B02540
Segment Type: other
Provision Reference: 
Character Range: 2721–4383

in service after the last inspection required by the original issue of this Directive, whichever occurs later. Inspect thereafter at intervals not to exceed 100 hours time in service, until the upper longeron is replaced and modified in accordance with SL No. 217B, revised 10 November 2003.

3.         Initially inspect upon the accumulation of 1,750 total hours time in service or within the next 100 hours time in service after the last inspection required by the original issue of this Directive, whichever occurs later. Inspect thereafter at intervals not to exceed 100 hours time in service, until the upper longeron is replaced and modified in accordance with SL No. 217B, revised 10 November 2003.

            This Airworthiness Directive becomes effective on 30 September 2004.

            Background: The FAA received reports of three occurrences of cracks found on the left hand upper longeron and upper diagonal support tubes where they intersect on the left side of the fuselage frame just forward of the vertical fin front spar attachment point, on Model AT-602 aircraft. The cracks were found by the pilot and/or ground crew when they noticed excessive movement of the empennage due to the loss of torsional rigidity.

            Amendment 1 is issued in response to a new FAA AD, which changes the compliance times, and incorporates new and revised manufacturer service information that contains a terminating action for the repetitive inspection requirement.

 David Villiers
 Delegate of the Civil Aviation Safety Authority 20 August 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 8 September 2004.