AD/CT7/7 Amdt 1 - Stage 1 and Stage 2 Gas Generator Turbine Disks (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

General Electric Turbine Engines - CT7 Series

AD/CT7/7 Amdt 1

Stage 1 and Stage 2 Gas Generator Turbine Disks 7/98

Applicability: General Electric CT7-5, -7, and -9 series engines incorporating Gas Generator Turbine (GGT) disks, P/No. 6064T06P01(Stage 1) or 6064T12P01(Stage 2).

Requirement: Perform a one time eddy current inspection of affected GGT disks in accordance with General Electric Service Bulletin (CT7-TP series) A72-393 Revision 1 dated 13 February 1997.

Note 1: Disks inspected per the original issue of this Directive satisfy the intent of this amendment to the Directive.

Note 2: FAA AD 97-25-07 also refers.

Note 3: FAA AD 97-25-07 supersedes FAA AD 97-05-12.

Compliance: Unless previously accomplished:

(a) For Stage 1 GGT disks identified in Table 1 of General Electric Service Bulletin (CT7-TP series) A72-393 Revision 1 that have accumulated 8,500 or more Cycles Since New (CSN) on the effective date of this Directive, inspect at the next GGT module removal or within 3 months of the effective date of this Directive whichever occurs first.

(b) For Stage 1 GGT disks identified in Table 1 of General Electric Service Bulletin (CT7-TP series) A72-393 Revision 1 that have accumulated less than 8,500 CSN, inspect at the next GGT module removal but not to exceed 9,000 CSN.

(c) For Stage 1 GGT disks identified in Table 2 of General Electric Service Bulletin (CT7-TP series) A72-393 Revision 1 that have accumulated 11,500 or more CSN on the effective date of this Directive, inspect at the next GGT module removal or within 3 months of the effective date of this Directive whichever occurs first.