AD 93-14-18

93-14-18 GENERAL ELECTRIC COMPANY: Amendment 39-8643. Docket 92-ANE-10.

Applicability: General Electric Company (GE) CF6-6/-45/-50/-80A/-80C2 series turbofan engines that contain high pressure turbine (HPT) thermal shields as listed in the applicable service bulletins that are referenced in this AD, installed on but not limited to Airbus A300 and A310 series, Boeing 747 and 767 series, and McDonnell Douglas DC-10 and MD-11 series aircraft.

Compliance: Required as indicated, unless accomplished previously.

To prevent an uncontained engine failure, accomplish the following:

(a) Perform either an impression and optical comparitor inspection or an ultrasonic inspection of the HPT thermal shield at the next HPT shop visit, or by December 12, 1995, whichever occurs first, as follows:

(1) For GE CF6-6 engines, in accordance with GE CF6-6 Service Bulletin (SB) No. 72-983, Revision 1, dated October 10, 1991.

(2) For CF6-45/-50 engines, in accordance with GECF6-50 SB No. 72-1021, Revision 1, dated October 10, 1991.

(3) For CF6-80A engines, in accordance with GE CF6-80A SB No. 72-596, Revision 1, dated October 10, 1991.

(4) For CF6-80C2 engines, in accordance with GE CF6-80C2 SB No. 72-565, Revision 1, dated October 10, 1991.

(b) Remove from service prior to further flight, and replace with a serviceable part, HPT thermal shields that do not meet the service criteria contained in the applicable service bulletins as specified in paragraph (a) of this AD.

(c) For the purpose of this AD, a shop visit is defined as the removal of the HPT module from the engine for any reason.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. The request should be forwarded through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office.

NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office.

(e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) The inspections shall be done in accordance with the following service bulletins:

Document No. Pages Revision Date GE CF6-6 SB 1-3 1 October 10, 1991 No. 72-983 4-30 Original September 19, 1991 Total Pages: 30

GE CF6-50 SB 1-3 1 October 10, 1991 No. 72-1021 4-30 Original September 19, 1991 Total Pages: 30

GE CF6-80A SB 1-3 1 October 10, 1991 No. 72-596 4-31 Original September 19, 1991 Total Pages: 31

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFRpart 51. Copies may be obtained from General Electric Aircraft Engines, CF6 Distribution Clerk, Room 132, 111 Merchant Street, Cincinnati, OH 45246. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street NW., suite 700, Washington, DC.

(g) This amendment becomes effective on October 4, 1993.