AD 86-12-03

86-12-03 GENERAL ELECTRIC COMPANY: Amendment 39-5311. Applies to General Electric (GE) CF6- 50 and -45 turbofan engines.

To prevent possible failure of high pressure turbine rotor (HPTR) stage 1 disk, accomplish the following:

(a) Remove from service, in accordance with General Electric (GE) Alert Service Bulletin (SB) A72- 859, Revision 1, dated January 1, 1986, those HPTR stage 1 disks identified by specific serial numbers listed in GE Alert SB A72-859, Revision 1, under Paragraph 2., Table 1, for inspection to determine conformance with the FAA approved type design.

(b) Compliance required as follows:

(1) For those disks with less than 5,490 flight cycles since new on the effective date of this AD, comply prior to the accumulation of 5,500 flight cycles.

(2) For those disks with 5,490 or greater flight cycles since new on the effective date of this AD, comply within the next 10 flight cycles.

(c) Those HPTR stage 1 disks which do not conform to the FAA approved type design will be retired from service.

(d) Those HPTR stage 1 disks which conform to the FAA approved type design may be returned to service.

NOTE: For the purpose of this AD, the number of flight cycles equals the number of flights that involve an engine operating sequence consisting of engine starting, takeoff operation, landing and engine shutdown.

Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the AD can be accomplished.

Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Engine Certification Office, Aircraft Certification Division, New England Region, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.

Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Engine Certification Office may adjust the compliance time specified in this AD.

GE Alert SB A72-859, Revision 1, dated January 1, 1986, identified and described in this document, is 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 this document from the manufacturer may obtain copies upon request to General Electric Company, 1 Neumann Way, Cincinnati, Ohio 45215. This document also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except Federal holidays.

This amendment becomes effective on June 29, 1986.