AD 2014-21-01 Airworthiness Directives; General Electric Company Turbofan Engines

This AD applies to all General Electric Company (GE) CF6-80C2 and CF6-80E1 series turbofan engines with fuel manifold, part number (P/N) 1303M31G04, 1303M32G04, 1303M31G06, 1303M32G06, 1303M31G07, 1303M32G07, 1303M31G08, 1303M32G08, 1303M31G12, 1303M32G12, 2420M70G01, or 2420M71G01, installed.

(1) For the purposes of this AD, an engine shop visit is the induction of an engine into the shop where the separation of a major engine flange occurs, except that induction into the shop for any of the reasons in paragraphs (f)(i) through (f)(iv) of this AD is not an engine shop visit: (i) Induction of an engine into a shop solely for removal of the compressor top or bottom case for airfoil maintenance, or for variable stator vane bushing replacement; (ii) Induction of an engine into a shop solely for replacement of the turbine rear frame; (iii) Induction of an engine into a shop solely for replacement of the accessory gearbox or transfer gearbox, or both; or (iv) Induction of an engine into a shop solely for core vibration trim balance procedure that requires separation of a major engine flange. (2) For the purposes of this AD, a first-run engine is an engine that has not had a shop visit since entering service.

(1) The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. (2) Previously approved AMOCs for AD 2009-05-02 (74 FR 8161, February 24, 2009) remain approved for the corresponding requirements of paragraphs (e)(1) and (e)(2) of this AD.

Comply with this AD within the compliance times specified, unless already done. (1) Fuel Manifold Removal. (i) After the effective date of this AD, do not return to service any CF6-80C2 or CF6-80E1 series engine with fuel manifold P/N 1303M31G04, 1303M32G04, 1303M31G06, 1303M32G06, 1303M31G07, 1303M32G07, 1303M31G08, or 1303M32G08, installed. (ii) At the next engine shop visit after the effective date of this AD, remove from service fuel manifold P/Ns 1303M31G12, 1303M32G12, 2420M70G01, and 2420M71G01. (2) Fuel Manifold, Loop Clamp, and Tube (Block) Clamp Initial and Repetitive Inspection and Replacement. (i) For CF6-80C2 and CF680E1 series engines, with fuel manifold, P/N 1303M31G12, 1303M32G12, 2420M70G01, or 2420M71G01 installed, inspect the fuel manifold and replace if required by inspection results, and replace the loop clamps as follows: (A) For CF6-80C2 series engines, use paragraphs 3.A, 3.C, and 3.D of GE CF6-80C2 Service Bulletin (SB) No. S/B 73-0326 R04, Revision 4, dated December 23, 2009, to do the inspection and replacements. (B) For CF6-80E1 series engines, use paragraphs 3.A, 3.B, and 3.C of GE CF6-80E1 SB No. S/B 73-0061 R04, Revision 4, dated December 23, 2009, to do the inspection and replacements. (C) Compliance time for fuel manifold inspection and loop clamp replacement: ( 1 ) If the engine is a first-run engine, inspect the fuel manifold and replace the loop clamps within 7,500 flight hours (FH) time-since-new (TSN). ( 2 ) If the engine's fuel manifold was ever inspected and new loop clamps were previously installed, inspect the fuel manifold and replace the loop clamps within 7,500 FH time-since-last-inspection (TSLI). ( 3 ) If the engine's fuel manifold was not inspected, new loop clamps were not installed, or it is unknown when the loop clamps were installed, inspect the fuel manifold and replace the loop clamps within 1,750 FH time-since-last-shop-visit or within 4 months after the effective date of this AD, whichever occurs later. (ii) For CF6-80C2 and CF6-80E1 series engines, with fuel manifold, P/N 1303M31G12, 1303M32G12, 2420M70G01, or 2420M71G01, with tube (block) clamp, P/N 1153M26G15, installed, inspect fuel manifold and tube (block) clamps, and replace if required by inspection results, as follows: (A) For CF6-80C2 series engines, use paragraphs 3.A.(1) through 3.A.(8) and 3.C.(1) through 3.C.(2) of GE CF6-80C2 SB No. S/B 73-0414, Revision 1, dated May 29, 2014, to do the inspection. (B) For CF6-80E1 series engines, use paragraphs 3.A.(1) through 3.A.(6) and 3.C.(1) through 3.C.(2) of GE CF6-80E1 SB No. S/B 73-0121, Revision 1, dated May 29, 2014, to do the inspection. (C) Compliance time for fuel manifold and tube (block) clamp inspection: ( 1 ) If the engine is a first-run engine, inspect the fuel manifold and tube (block) clamps within 7,500 FH TSN or within 3 months after the effective date of this AD, whichever occurs later. ( 2 ) If the engine was previously inspected using either of GE CF6-80C2 SB No. S/B 73-0414, Revision 1, dated May 29, 2014, or GE CF6-80E1 SB No. S/B 73-0121, Revision 1, dated May 29, 2014, or earlier versions, then inspect the fuel manifold and tube (block) clamps within 7,500 FH TSLI or within 3 months after the effective date of this AD, whichever occurs later. ( 3 ) If the engine is not a first-run engine and was not previously inspected using GE CF6-80C2 SB No. S/B 73-0414, Revision 1, dated May 29, 2014, or GE CF6-80E1 SB No. S/B 73-0121, Revision 1, dated May 29, 2014, or earlier versions, then inspect the fuel manifold and tube (block) clamps within 7,500 FH TSN or within 3 months after the effective date of this AD, whichever occurs later. (iii) Thereafter, inspect fuel manifold, P/Ns 1303M31G12, 1303M32G12, 2420M70G01, and 2420M71G01, and tube (block) clamps, replace if required by inspection results, and replace the loop clamps within every 7,500 FH TSLI, using paragraphs (e)(2)(i)(A), (e)(2)(i)(B), (e)(2)(ii)(A), and (e)(2)(ii)(B) of this AD, as applica

This AD supersedes AD 90-26-01, Amendment 39-6810 (55 FR 49611, November 30, 1990); AD 91-20-02, Amendment 39-8036 (56 FR 55231, October 25, 1991); and AD 2009-05-02, Amendment 39-15826, (74 FR 8161, February 24, 2009).