AD 2007-05-16 Airworthiness Directives; General Electric Aircraft Engines (GE) CF34-3A1/-3B/-3B1 Turbofan Engines

This AD applies to General Electric Aircraft Engines (GE) CF34-3A1/-3B/-3B1 turbofan engines that have fan disks with serial numbers (SNs) listed in Table 1 of this AD. Table 1.—Fan Disk SNs and Last Known Associated Engine Serial Number (ESN) SN (Fan Disk) ESN (current) GEE148JH 872787 GEE01629 807168 GEE01888 807188 GEE147MF 807620 GEE147NA 807622 GEE147V5 807624 GEE147VC 807625 GEE148JG 807633 GEE145LL 872526 GEE145NK 872545 GEE1466F 872563 GEE1466L 872568 GEE146H3 872599 GEE146KD 872604 GEE146N7 872634 GEE147N7 872705 GEE147N8 872709 GEE14818 872727 GEE14815 872730 GEE1480J 872731 GEE1485J 872745 GEE1480F 872750 GEE14885 872763 GEE148EJ 872780 GEE148FT 872785 GEE148ER 872790 GEE148PN 872804 GEE148RN 872811 GEE148TW 872817 GEE03675 SPARE GEE148R0 SPARE GEE148VT 872830 GEE148WC 872837 GEE1F9G6 872841 GEE1F9G8 872846 GEE1F9GA 872849 GEE1F9WN 872857 GEE1FA22 872866 GEE1FA6H 872886 (d) For reference, affected regional jet fan disk part numbers (P/Ns) are 5922T01G04, 5922T01G05, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06. (e) For reference, affected business jet fan disk P/Ns are 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06. (f) These engines are installed on, but not limited to, Bombardier, Inc. CL-600-2B16 (CL-601-3R Variant), CL-600-2B16 (CL-604 Variant), and CL-600-2B19 (Regional Jet Series 100 and 440) model airplanes.

You are responsible for having the actions required by this AD performed within 20 engine flight hours after the effective date of this AD, unless the actions have already been done. Inspection of the Fan Disk (i) Perform a onetime visual and tactile inspection of the bore area on the 39 fan disks listed in Table 1 of this AD, that have not had a shop-level inspection. (j) For regional jet engine models CF34-3A1/-3B1, use paragraphs 3.A through 3.B.(2)(h) of the Accomplishment Instructions of GE Alert Service Bulletin (ASB) No. CF34-AL S/B 72-A0232, Revision 1, dated February 27, 2007, to do the inspections. (k) For business jet engine models CF34-3A1/-3B, use paragraphs 3.A through 3.B.(2)(h) of the Accomplishment Instructions of GE ASB No. CF34-BJ S/B 72-A0213, Revision 1, dated February 27, 2007, to do the inspections. Previous Inspection Credit (l) Previous inspection credit is allowed: (1) For regional jet engine models CF34-3A1/-3B1, inspected using paragraphs 3.A through 3.B.(2)(g) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0232, dated February 15, 2007, for the fan disk SNs listed in emergency AD 2007-04-51. (2) For business jet engine models CF34-3A1/-3B, inspected using paragraphs 3.A through 3.B.(2)(g) of the Accomplishment Instructions of GE ASB No. CF34-BJ S/B 72-A0213, dated February 15, 2007, for the fan disk SNs listed in emergency AD 2007-04-51. (m) Fan disks listed in Table 1 of this AD that have already had a full visual inspection, eddy current inspection, and fluorescent penetrant inspection using GE CF34-3 (BJ) Heavy Maintenance Manual SEI-782, Section 72-21-00, or using GE CF34-3 (RJ) Engine Manual SEI-756, Section 72-21-00, are considered in compliance with this AD. Alternative Methods of

This AD results from GE discovering eight additional SNs of fan disks suspected of having an arc-out defect, and from the original report that a GE CF34-3B1 turbofan engine experienced an uncontained fan disk failure during flight operation. We are issuing this AD to prevent an uncontained fan disk failure and airplane damage.