79-23-04 GENERAL ELECTRIC COMPANY: Amendment 39-3610. Applies to all General Electric CT58 turboshaft engines which are presently in use or have been used in repetitive heavy-lift operation.
Compliance required as indicated, unless already accomplished.
To prevent low cycle fatigue initiated failure, revise the total recorded operating cycles of all life-limited rotating components, on the effective date of this AD, and remove these components from service in accordance with the multiplying factors and retirement lives contained in General Electric Alert Service Bulletin CT58 (A72- 162) CEB-258, dated July 9, 1979. Later FAA approved revisions or equivalent means may be approved by the Chief, Engineering and Manufacturing Branch, New England Region. Hourly limits are not affected by this AD.
Components with revised total recorded operating cycles in excess of the limits or within 600 cycles or 100 hours of the limits in Tables I, II, or III of General Electric Alert Service Bulletin CT58 (A72-162) CEB-258, on the effective date of this AD, must be removed from service prior to the accumulation of 600 additional cycles or 100 hours, whichever comes first.
NOTE: Repetitive heavy-lift operations are considered to be those operations during which a lift-carry-drop cycle is repeated more than 10 times per hour without landing. This activity is typical of logging operations and may also include some construction or utility operations.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies upon request to General Electric Company, 1000 Western Avenue, Lynn, Massachusetts, 01910. These documents may also be examined at the Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at its Headquarters in Washington, D.C., and at FAA, New England Region Headquarters, Burlington, Massachusetts.
This amendment becomes effective upon publication in the Federal Register.