Document ID: chunk:federal_register_of_legislation:F2006B07471:body:0:p2
Version: federal_register_of_legislation:F2006B07471
Segment Type: other
Provision Reference: 
Character Range: 2910–3997

331 Series

 AD/TPE 331/61 (continued)

            For first stage turbine disks with more than 4,100 CSN, inspect at next access, but within 400 cycles-in-service (CIS) after the effective date of this AD.

            For Requirement 2:

            At each scheduled hot section inspection. For Requirement 3:
            Before return to service following the FPI.

            This Airworthiness Directive becomes effective on 2 September 2004.

            Background: This Directive requires initial and repetitive FPIs and ECIs of the affected first stage turbine disks. This Directive results from a report of a first stage turbine disk found cracked at the disk bore. The crack originated from a localized; melt related, low- alloy area of the disk. Failure of the disk could lead to uncontained disk separation, resulting in engine damage and shutdown and damage to the aeroplane.

 Bernard Malcolm Hole
 Delegate of the Civil Aviation Safety Authority 9 July 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 11 August 2004.