AD 2007-07-07 Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines

This AD applies to General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines, with fan disks part numbers (P/Ns) 5921T18G01, 5921T18G09, 5921T18G10, 5921T54G01, 5922T01G02, 5922T01G04, 5922T01G05, 6020T62G04, 6020T62G05, 6078T00G01, 6078T57G01, 6078T57G02, 6078T57G03, 6078T57G04, 6078T57G05, and 6078T57G06 installed. These engines are installed on, but not limited to, Bombardier Canadair airplane models CL-600-2A12, -2B16, and -2B19.

You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Removal of Certain Fan Disks From Service (f) For fan disks listed by P/N and SN in the following Table A that have fewer than 8,000 cycles-since-new (CSN) on the effective date of this AD, replace fan disks before accumulating 8,000 CSN: Table A.—Fan Disks That Require Removal Based on Blended Callouts Disk part No. Disk serial No. 6078T57G02 GAT6306N 6078T00G01 GAT3860G 6078T57G02 GAT1924L 5922T01G04 GAT9599G 6078T57G04 GEE05831 6078T57G04 GEE06612 6078T57G04 GEE06618 6078T57G04 GEE06974 6078T57G04 GEE06980 6078T57G05 GEE143FY 6078T57G05 GEE1453G 6078T57G05 GEE14452 6078T57G05 GEE145NA 6078T57G04 GEE08086 6078T57G04 GEE09287 6078T57G04 GEE09337 6078T57G05 GEE12720 6078T57G05 GEE14214 6078T57G05 GEE142YT 6078T57G05 GEE146GT (g) For fan disks listed in Table A of this AD that have 8,000 CSN or more on the effective date of this AD, replace the disk within 15 days after the effective date of this AD. Inspections of Fan Disks Installed in Regional Jet Airplanes (h) For CF34-3A1 and CF34-3B1 turbofan engines installed on Bombardier Canadair CL600-2B19 Regional Jet airplanes: On-Wing Tactile and Enhanced Visual (TEV) Inspection (1) On-wing TEV inspect the fan disks listed by P/N and SN in Table 1 of GE Alert Service Bulletin (ASB) No. CF34-AL S/B 72-A0231, dated March 7, 2007, using the compliance times specified in the following Table B: Table B.—Regional Jet On-Wing Fan Disk Inspection Compliance Times For fan disks: Inspect: (i) That have not had a shop-level inspection Within 500 flight hours after the effective date of this AD. (ii) That are marked with an asterisk in Table 1 of GE ASB No. CF34-AL S/B 72-A0231, dated March 7, 2007 Within 500 flight hours after the effective date of this AD. (2) Use paragraphs 3.A. through 3.A.(13) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0231, dated March 7, 2007, to do the inspection. Shop-level Inspection (3) Within 5,000 flight hours or 5 calendar years after the effective date of this AD, whichever occurs first, fluorescent penetrant inspect (FPI), TEV inspect, and eddy current inspect (ECI) at shop-level for cracks and electrical arc-out defects on the fan disks listed by P/N and SN in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 2, dated March 22, 2007. (4) Use paragraphs 3.A.(1) through 3.A.(6) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0233, Revision 2, dated March 22, 2007, to do the inspections. Shop-level Inspection Exemption (5) Fan disks are exempt from the shop-level inspection that meet the following criteria: (i) Fan disks inspected before the effective date of this AD per GE Engine Manual No. SEI-756, Section 72-21-00 (FAN ROTOR ASSEMBLY INSPECTION); and (ii) That have accumulated no more than 100 cycles since that inspection; and (iii) That pass the on-wing TEV inspection in paragraph (h)(2) of this AD. Inspection of Fan Disks Installed in Business Jet Airplanes (i) For CF34-1A, -3A, -3A1, -3A2, and -3B turbofan engines installed on Bombardier Canadair Models CL-600-2A12 (CL-601), CL-600-2B16 (CL-601-3A), (CL-601-3R), and (CL-604) Business Jet airplanes: (1) FPI, TEV inspect, and ECI for cracks and electrical arc-out defects at shop-level on the fan disks listed by P/N and SN in Table 1 of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2, dated March 22, 2007, using the compliance times specified in the following Table C: Table C.—Business Jet Shop-Level Fan Disk Inspection Compliance Times For fan disks: Inspect: (i) That have more than 5,500 flight hours on the effective date of this AD Within 500 flight hours after the effective date of this AD. (ii) That have 5,500 or fewer flight hours on the effective date of this AD Within accumulating a total of 6,000 fan disk operating hours-since-new, or 5 calendar years, whichever occurs first. (2) Use paragraphs 3.A. through 3.A.(10) of the Accomplishment Instructions of GE ASB No. CF34-BJ S/B 72-A0212, Revision 2, dated March 22, 2007, to do the inspections. Reporting Requirements (j) Report the results of the on-wing inspections performed in paragraph (h)(2) by following the instructions in paragraph 3.A.(14) of the Accomplishment Instructions of GE ASB No. CF34-AL S/B 72-A0231, dated March 7, 2007. Under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements contained in this AD, and has assigned OMB Control Number 2120-0056. Previous Credit (k) Credit is allowed for fan disks previously shop-level inspected using GE ASB No. CF34-AL S/B 72-A0233, dated March 7, 2007 or Revision 1 of that ASB dated March 16, 2007, or GE ASB No. CF34-BJ S/B 72-A0212, dated March 7, 2007 or Revision 1 of that ASB dated March 16, 2007, before the effective date of this AD. Alternative Methods of

This AD results from a report that in January 2007, a 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.