AD 82-25-08

82-25-08 GENERAL ELECTRIC COMPANY: Amendment 39-4507. Applies to the CF6-45 series and CF6-50 series model turbofan engines.

Compliance required as indicated.

To prevent potential separation of the spacer/impeller which could result in uncontained engine failure, accomplish the following:

(a) Perform fluorescent penetrant inspection of the HPT Spacer/Impeller, Part Numbers 9045M59P07, P08, P10, P12; 9173M55P01, P02, P03; 9198M92P01, P02, P03, P04, P05, P06, P07, P08, P09, P10; 9190M82P02, P03; 9234M25P01, P02, P03; and 9234M25P04 in accordance with General Electric CF6-50/45 Service Bulletin 72-748, Revision 1, dated June 9, 1982, or later revision approved by the Manager, Engine Certification Branch, FAA, New England Region, Burlington, Massachusetts 01803, per the following schedule:

Prior to the accumulation of 5,000 cycles in service, or within 3,000 cycles since the last inspection, or within the next 100 cycles after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 3,000 cycles since last inspection.

(NOTE: Established life limits for the part shall not be exceeded.)

(b) Spacer/impellers with any crack indications shall be removed from service prior to further flight.

(c) Spacer/impeller inspections which have been performed prior to the effective date of this AD which are identical to the inspection requirements of Service Bulletin 72-748 are considered to be an acceptable means of compliance with the initial inspection requirements of Paragraph (a).

(d) Upon request of the operator, an equivalent means of compliance with the requirements of this AD may be used if approved by the Manager, Engine Certification Branch, FAA, New England Region.

(e) Airplanes may be ferried in accordance with the provisions of Federal Aviation Regulation 21.197 to a base where the AD can be accomplished.

This amendment becomes effective on December 30, 1982.