Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines, 17799-17802 [E9-8787]

Download as PDF Federal Register / Vol. 74, No. 73 / Friday, April 17, 2009 / Proposed Rules Issued in Burlington, Massachusetts, on April 9, 2009. Peter A. White, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E9–8786 Filed 4–16–09; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2007–27687; Directorate Identifier 2000–NE–42–AD] RIN 2120–AA64 Airworthiness Directives; General Electric Company CF34–1A, –3A, –3A1, –3A2, –3B, and –3B1 Turbofan Engines dwashington3 on PROD1PC60 with PROPOSALS AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Supplemental Notice of proposed rulemaking (NPRM); reopening of comment period. Comments Invited SUMMARY: This notice revises an earlier proposed airworthiness directive (AD), and supersedes an existing AD applicable to General Electric Company (GE) CF34–1A, –3A, –3A1, –3A2, –3B, and –3B1 turbofan engines. This proposed AD reopens the comment period, since we added additional requirements based on responses we received. This proposed AD would now require: • Inspecting certain fan disks for electrical arc-out indications, • Removing from service fan disks with electrical arc-out indications, • Performing tactile and enhanced visual (TEV) inspections, fluorescent penetrant inspections (FPI), and eddy current inspections (ECI) on certain disks that have already had a shop-level inspection, and • Repetitive FPI and ECI on certain fan disks. This proposed AD results from an updated risk analysis by GE that shows we need to take corrective action that is more stringent. We are proposing this AD to prevent an uncontained failure of the fan disk, which could result in damage to the airplane. DATES: We must receive any comments on this proposed AD by June 16, 2009. ADDRESSES: Use one of the following addresses to comment on this proposed AD. • Federal eRulemaking Portal: Go to https://www.regulations.gov and follow the instructions for sending your comments electronically. • Mail: Docket Management Facility, U.S. Department of Transportation, 1200 VerDate Nov<24>2008 15:03 Apr 16, 2009 Jkt 217001 New Jersey Avenue SE., West Building Ground Floor, Room W12–140, Washington, DC 20590–0001. • Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. • Fax: (202) 493–2251. Contact General Electric Company via Lockheed Martin Technology Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215; telephone (513) 672–8400; fax (513) 672–8422, for the service information identified in this proposed AD. FOR FURTHER INFORMATION CONTACT: Tara Chaidez, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: tara.chaidez@faa.gov; telephone (781) 238–7773; fax (781) 238–7199. SUPPLEMENTARY INFORMATION: We invite you to send us any written relevant data, views, or arguments regarding this proposal. Send your comments to an address listed under ADDRESSES. Include ‘‘Docket No. FAA– 2007–27687; Directorate Identifier 2000–NE–42–AD’’ in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of the Web site, anyone can find and read the comments in any of our dockets, including, if provided, the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You may review the DOT’s complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477–78). Examining the AD Docket You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 17799 received, and other information. The street address for the Docket Operations office (telephone (800) 647–5527) is the same as the Mail address provided in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. Discussion We proposed to amend 14 CFR part 39 by superseding AD 2007–07–07R1, Amendment 39–15179 (72 FR 49183, August 28, 2007). That AD requires a onetime inspection of certain fan disks for electrical arc-out indications, replacing fan disks with electrical arcout indications, and reducing the life limit of certain fan disks. That NPRM was prompted by us determining that we inadvertently left out an inspection requirement in Table C of AD 2007–07– 07R1 to perform a shop inspection on disks that have greater than 6,000 flight hours and have already undergone a shop inspection. That condition, if not corrected, could result in an uncontained fan disk failure and airplane damage. On January 18, 2008, we published that proposal as an NPRM in the Federal Register (73 FR 3425). That NPRM would have required: • Replacing certain fan disks installed on regional jets within 15 days after the effective date of the proposed AD, and • On-wing and shop-level inspections of fan disks for electrical arc-out defects on fan disks installed on regional jets, and • Shop-level inspections of fan disks for electrical arc-out defects on fan disks installed on business jets. Since we issued that NPRM, GE performed an updated risk analysis that shows we need to take corrective action that is more stringent than that proposed in the NPRM. We also propose to amend 14 CFR part 39 by superseding AD 2007–05–16, Amendment 39–14977 (72 FR 10054, March 7, 2007). That AD requires a onetime visual and tactile inspection of certain areas of certain P/N and SN fan disks for an arc-out defect, within 20 engine flight hours after the effective date of that AD. Since we issued that AD, GE has added those SN fan disks to the applicable service bulletins for the repetitive inspection requirements of this proposed AD. Since these changes expand the scope of the originally proposed rule, we have determined that it is necessary to reopen the comment period to provide additional opportunity for public comment. This condition, if not corrected, could result in an uncontained failure of the fan disk and damage to the airplane. E:\FR\FM\17APP1.SGM 17APP1 17800 Federal Register / Vol. 74, No. 73 / Friday, April 17, 2009 / Proposed Rules Relevant Service Information We have reviewed and approved the technical contents of GE Alert Service Bulletins (ASBs) No. CF34–BJ S/B 72– A0212, Revision 04, dated October 27, 2008; CF34–BJ S/B 72–A0234, dated October 27, 2008; CF34–BJ S/B 72– A0235, dated October 27, 2008; CF34– AL S/B 72–A0233, Revision 04, dated October 27, 2008; CF34–AL S/B 72– A0252, dated October 27, 2008; and CF34–AL S/B 72–A0253, dated October 27, 2008. These ASBs list the affected fan disks by serial number, part number, and tier, and describe procedures for performing TEV inspections, FPI, and ECI for cracks and electrical arc-out defects. FAA’s Determination and Requirements of the Proposed AD We have evaluated all pertinent information and identified an unsafe condition that is likely to exist or develop on other products of this same type design. We are proposing this AD, which would require initial and repetitive FPI, ECI, and TEV inspections. The proposed AD would require you to use the service information described previously to perform these actions. dwashington3 on PROD1PC60 with PROPOSALS Costs of Compliance We estimate that this proposed AD would affect 1,531 engines installed on airplanes of U.S. registry. We also estimate that it would take about 2 work-hours per engine to perform the proposed on-wing inspection on 300 engines, and 4 work-hours per engine to perform the proposed shop inspection on 1,531 engines. The average labor rate is $80 per work-hour. There are no required parts. Based on these figures, we estimate the total cost of the proposed AD to U.S. operators to be $537,920. Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in subtitle VII, part A, subpart III, section 44701, ‘‘General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority VerDate Nov<24>2008 15:03 Apr 16, 2009 Jkt 217001 because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that the proposed AD: 1. Is not a ‘‘significant regulatory action’’ under Executive Order 12866; 2. Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and 3. Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD. You may get a copy of this summary at the address listed under ADDRESSES. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Proposed Amendment Under the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by removing Amendment 39–14977 (72 FR 10054, March 7, 2007) and Amendment 39–15179 (72 FR 49183, August 28, 2007), and by adding a new airworthiness directive to read as follows: General Electric Company: Docket No. FAA– 2007–27687; Directorate Identifier 2000– NE–42–AD. Comments Due Date (a) The Federal Aviation Administration (FAA) must receive comments on this airworthiness directive (AD) action by June 16, 2009. PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 (b) This AD supersedes AD 2007–05–16, Amendment 39–14977 and AD 2007–07– 07R1, Amendment 39–15179. Applicability (c) 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. Unsafe Condition (d) This AD results from an updated risk analysis by GE that shows we need to take corrective action that is more stringent. We are issuing this AD to prevent an uncontained failure of the fan disk, which could result in damage to the airplane. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Removing Certain Fan Disks from Service (f) For fan disks listed by P/N and serial number (SN) in Table 2 of GE Alert Service Bulletin (ASB) CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008; or in Table 2 of GE ASB CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008 that have 8,000 CSN or more on the effective date of this AD, remove fan disks from service within 15 days after the effective date of this AD. (g) For fan disks listed by P/N and serial number (SN) in Table 2 of GE Alert Service Bulletin (ASB) CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008; or in Table 2 of GE ASB CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008, that have fewer than 8,000 CSN on the effective date of this AD, remove fan disks from service before accumulating 8,000 CSN. Inspections of Tier 1 Fan Disks (h) For CF34–3A1 engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 22,000 CSN, and CF34–3B1 turbofan engines with Tier 1 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008, do the following: Tactile and Enhanced Visual (TEV) Inspections, Fluorescent Penetrant Inspections (FPI), and Eddy Current Inspections (ECI) (1) For Tier 1 fan disks not already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) Perform a TEV inspection, an FPI, and an ECI on the Tier 1 fan disks within 650 cycles-in-service (CIS) after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0233, Revision 04, dated E:\FR\FM\17APP1.SGM 17APP1 Federal Register / Vol. 74, No. 73 / Friday, April 17, 2009 / Proposed Rules October 27, 2008, to perform the TEV inspection, FPI, and ECI. (ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks within intervals of 3,000 cycles-since-last inspection (CSLI). Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0252, dated October 27, 2008, to perform the repetitive ECI. (2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008; already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) For Tier 1 fan disks with 2,500 or more CSLI on the effective date of this AD, perform an ECI on the Tier 1 fan disks within 500 CIS after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0252, dated October 27, 2008, to perform the ECI. (ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the effective date of this AD, perform an ECI on the Tier 1 fan disks within 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0252, dated October 27, 2008, to perform the ECI. (iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0252, dated October 27, 2008, to perform the repetitive ECI. dwashington3 on PROD1PC60 with PROPOSALS Inspections of Tier 2 Fan Disks (i) For CF34–3A1 engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 22,000 CSN, and CF34–3B1 turbofan engines with Tier 2 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008, do the following: TEV Inspections, FPI, and ECI (1) For Tier 2 fan disks not already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) Perform a TEV inspection, an FPI, and an ECI on the Tier 2 fan disks within 2,000 CIS after the effective date of this AD, or within 5,000 CIS after September 12, 2007, or by March 19, 2012, whichever occurs first. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0233, Revision 04, dated October 27, 2008, to perform the TEV inspection, FPI, and ECI. (ii) Thereafter, perform repetitive eddy current inspections on the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0252, dated October 27, 2008, to perform the repetitive ECI. (2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008; already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, do the following: VerDate Nov<24>2008 15:03 Apr 16, 2009 Jkt 217001 (i) For Tier 2 fan disks with 2,500 or more CSLI on the effective date of this AD, perform an ECI on the Tier 2 fan disks within 500 CIS after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0252, dated October 27, 2008, to perform the ECI. (ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the effective date of this AD, perform an ECI on the Tier 2 fan disks within 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0252, dated October 27, 2008, to perform the ECI. (iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0252, dated October 27, 2008, to perform the repetitive ECI. Inspections of Tier 3 Fan Disks (j) For CF34–3A1 engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 22,000 CSN, and CF34–3B1 turbofan engines with Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72– A0233, Revision 04, dated October 27, 2008, do the following: TEV Inspections, FPI, and ECI (1) For Tier 3 fan disks not already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, perform a TEV inspection, an FPI, and an ECI on the Tier 3 fan disks within 5,000 CIS after September 12, 2007, or by March 19, 2012, whichever is earlier. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0253, Revision 04, dated October 27, 2008, to perform the TEV inspection, FPI, and ECI. (2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008; already inspected using GE ASB No. CF34–AL S/B 72–A0233, Revision 03, dated June 27, 2007, or earlier issue, perform a TEV inspection and an ECI on the Tier 3 fan disks at the next shop visit. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0253, dated October 27, 2008, to perform the TEV inspection and ECI. (3) Repetitive ECI on the Tier 3 fan disks are not required. Inspections of Tier 1 Fan Disks (k) For CF34–1A turbofan engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 15,000 CSN, CF34–3A, CF34–3A2, and CF34–3B turbofan engines with Tier 1 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008, do the following: TEV Inspections, FPI, and ECI (1) For Tier 1 fan disks not already inspected using GE ASB No. CF34–BJ S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue: (i) Perform a TEV inspection, FPI, and ECI on the Tier 1 fan disks within 350 CIS after PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 17801 the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008, to perform the TEV inspection. (ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0235, dated October 27, 2008, to perform the repetitive ECI. (2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008; already inspected using GE ASB No. CF34–BJ S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) For Tier 1 fan disks with 2,500 or more CSLI on the effective date of this AD, perform an ECI on the Tier 1 fan disks within 500 CIS after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72– A0235, dated October 27, 2008, to perform the ECI. (ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the effective date of this AD, perform an ECI on the Tier 1 fan disks within 3,000 CSLI after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72– A0235, dated October 27, 2008, to perform the ECI. (iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72–A0235, dated October 27, 2008, to perform the repetitive ECI. Inspections of Tier 2 Fan Disks (l) For CF34–1A turbofan engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 15,000 CSN, CF34–3A, CF34–3A2, and CF34–3B turbofan engines with Tier 2 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72–A0212, Revision 04, dated October 27, 2008, do the following: TEV Inspections, FPI, and ECI (1) For Tier 2 fan disks not already inspected using GE ASB No. CF34–AL S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) Perform a TEV inspection, FPI, and ECI on the Tier 2 fan disks within 2,000 CIS after the effective date of this AD, or within 3,500 CIS after September 12, 2007, or by March 19, 2012, whichever occurs first. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72– A0212, Revision 04, dated October 27, 2008, to perform the TEV inspection, FPI, and ECI. (ii) Thereafter, perform repetitive ECI on the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0235, dated October 27, 2008, to perform the repetitive ECI. (2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008; already inspected using GE ASB E:\FR\FM\17APP1.SGM 17APP1 17802 Federal Register / Vol. 74, No. 73 / Friday, April 17, 2009 / Proposed Rules No. CF34–BJ S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue, do the following: (i) For Tier 2 fan disks with 2,500 or more CSLI on the effective date of this AD, perform an ECI on the Tier 2 fan disks within 500 CIS after the effective date of this AD. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72– A0235, dated October 27, 2008, to perform the ECI. (ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the effective date of this AD, perform an ECI on the Tier 2 fan disks within 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0235, dated October 27, 2008, to perform the ECI. (iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0235, dated October 27, 2008, to perform the repetitive ECI. Inspections of Tier 3 Fan Disks (m) For CF34–1A turbofan engines with fan drive shaft, P/N 6036T78P02, and airworthiness limitation section life limit of 15,000 CSN, CF34–3A, CF34–3A2, and CF34–3B turbofan engines with Tier 3 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008, do the following: dwashington3 on PROD1PC60 with PROPOSALS TEV Inspections, FPI, and ECI (1) For Tier 3 fan disks not already inspected using GE ASB No. CF34–AL S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue, perform a TEV inspection, FPI, and ECI on the Tier 3 fan disks within 3,500 CIS after September 12, 2007, or by March 19, 2012, whichever is earlier. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–AL S/B 72– A0234, dated October 27, 2008, to perform the TEV inspection, FPI, and ECI. (2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008; already inspected using GE ASB No. CF34–BJ S/B 72–A0212, Revision 03, dated June 27, 2007, or earlier issue, perform a TEV inspection and an ECI on the Tier 3 fan disks within 3,500 CSLI, but no later than March 19, 2012. Use paragraph 3.A of the Accomplishment Instructions of GE ASB CF34–BJ S/B 72–A0234, dated October 27, 2008, to perform the TEV inspection and ECI. (3) Repetitive ECI on the Tier 3 fan disks are not required. Alternative Methods of Compliance (n) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Mandatory Terminating Action (o) Remove from service, Tier 1 and Tier 2 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB No. CF34–AL S/B 72– A0233, Revision 04, dated October 27, 2008; or CF34–BJ S/B 72–0212, Revision 04, dated October 27, 2008, before they exceed their VerDate Nov<24>2008 15:03 Apr 16, 2009 Jkt 217001 limited life cycles or September 30, 2018, whichever occurs first. Related Information (p) Contact Tara Chaidez, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: tara.chaidez@faa.gov; telephone (781) 238–7773; fax (781) 238– 7199, for more information about this AD. (q) The following GE Alert Service Bulletins pertain to the subject of this AD: • CF34–AL S/B 72–A0233, Revision 04, dated October 27, 2008, • CF34–AL S/B 72–A0252, dated October 27, 2008, • CF34–AL S/B 72–A0253, dated October 27, 2008, • CF34–BJ S/B 72–A0212, Revision 04, dated October 27, 2008, • CF34–BJ S/B 72–A0234, dated October 27, 2008, and • CF34–BJ S/B 72–A0235, dated October 27, 2008. Contact General Electric Company via Lockheed Martin Technology Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215; telephone (513) 672–8400; fax (513) 672–8422, for a copy of this service information. Issued in Burlington, Massachusetts, on April 9, 2009. Peter A. White, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. E9–8787 Filed 4–16–09; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF THE INTERIOR Office of Surface Mining Reclamation and Enforcement 30 CFR Part 935 [OH–253–FOR; Docket ID: OSM–2009–0001] Ohio Regulatory Program AGENCY: Office of Surface Mining Reclamation and Enforcement (OSM), Interior. ACTION: Proposed rule; public comment period and opportunity for public hearing on the proposed amendment. SUMMARY: We are announcing receipt of an amendment to the Ohio regulatory program (the ‘‘Ohio program’’) under the Surface Mining Control and Reclamation Act of 1977 (SMCRA or the Act). Ohio has submitted changes to its regulations as a result of its five-year review of Ohio’s internal and procedural rules. Changes relate to practice and procedures before the reclamation commission, including definitions, commission meetings, appearance and practice before the commission; appeals to the reclamation PO 00000 Frm 00009 Fmt 4702 Sfmt 4702 commission; filing and service of papers; temporary relief; responsive pleadings; discovery; motions; prehearing procedures; notice of hearings and continuance of hearings; site views and location of hearings; conduct of evidentiary hearings; reports and recommendations of the hearing officer; and decisions of the commission. This document gives the times and locations that the Ohio program and proposed amendment to that program are available for your inspection, the comment period during which you may submit written comments on the amendment, and the procedures that we will follow for the public hearing, if one is requested. DATES: We will accept written comments until 4 p.m., d.s.t. May 18, 2009. If requested, we will hold a public hearing on May 12, 2009. We will accept requests to speak at a hearing until 4 p.m., d.s.t. on May 4, 2009. ADDRESSES: You may submit comments, identified by OH–253–FOR; Docket ID: OSM–2009–0001 by either of the following two methods: Federal eRulemaking Portal: www.regulations.gov. The proposed rule has been assigned Docket ID: OSM– 2009–0001. If you would like to submit comments through the Federal eRulemaking Portal, go to www.regulations.gov and do the following. Click on the ‘‘Advanced Docket Search’’ button on the right side of the screen. Type in the Docket ID OSM–2009–0001 and click the ‘‘Submit’’ button at the bottom of the page. The next screen will display the Docket Search Results for the rulemaking. If you click on OSM–2009– 0001, you can view the proposed rule and submit a comment. You can also view supporting material and any comments submitted by others. Mail/Hand Delivery/Courier: Mr. George Rieger, Chief, Pittsburgh Field Division, Columbus Office, Office of Surface Mining Reclamation and Enforcement, 4605 Morse Road, Room 102, Columbus, Ohio 43230. Instructions: For detailed instructions on submitting comments and additional information on the rulemaking process, see the ‘‘Public Comment Procedures’’ heading of the SUPPLEMENTARY INFORMATION section of this document. Docket: In addition to obtaining copies of documents at www.regulations.gov, information may also be obtained at the addresses listed below during normal business hours, Monday through Friday, excluding holidays. You may receive one free copy of the amendment by contacting OSM’s Pittsburgh Field Division Office. E:\FR\FM\17APP1.SGM 17APP1

Agencies

[Federal Register Volume 74, Number 73 (Friday, April 17, 2009)]
[Proposed Rules]
[Pages 17799-17802]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E9-8787]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-27687; Directorate Identifier 2000-NE-42-AD]
RIN 2120-AA64


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

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental Notice of proposed rulemaking (NPRM); reopening of 
comment period.

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SUMMARY: This notice revises an earlier proposed airworthiness 
directive (AD), and supersedes an existing AD applicable to General 
Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan 
engines. This proposed AD reopens the comment period, since we added 
additional requirements based on responses we received. This proposed 
AD would now require:
     Inspecting certain fan disks for electrical arc-out 
indications,
     Removing from service fan disks with electrical arc-out 
indications,
     Performing tactile and enhanced visual (TEV) inspections, 
fluorescent penetrant inspections (FPI), and eddy current inspections 
(ECI) on certain disks that have already had a shop-level inspection, 
and
     Repetitive FPI and ECI on certain fan disks.
    This proposed AD results from an updated risk analysis by GE that 
shows we need to take corrective action that is more stringent. We are 
proposing this AD to prevent an uncontained failure of the fan disk, 
which could result in damage to the airplane.

DATES: We must receive any comments on this proposed AD by June 16, 
2009.

ADDRESSES: Use one of the following addresses to comment on this 
proposed AD.
     Federal eRulemaking Portal: Go to https://www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility, U.S. Department of 
Transportation, 1200 New Jersey Avenue SE., West Building Ground Floor, 
Room W12-140, Washington, DC 20590-0001.
     Hand Delivery: Deliver to Mail address above between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
     Fax: (202) 493-2251.
    Contact General Electric Company via Lockheed Martin Technology 
Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215; 
telephone (513) 672-8400; fax (513) 672-8422, for the service 
information identified in this proposed AD.

FOR FURTHER INFORMATION CONTACT: Tara Chaidez, Aerospace Engineer, 
Engine Certification Office, FAA, Engine and Propeller Directorate, 12 
New England Executive Park, Burlington, MA 01803; e-mail: 
tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199.

SUPPLEMENTARY INFORMATION:

Comments Invited

    We invite you to send us any written relevant data, views, or 
arguments regarding this proposal. Send your comments to an address 
listed under ADDRESSES. Include ``Docket No. FAA-2007-27687; 
Directorate Identifier 2000-NE-42-AD'' in the subject line of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the proposed AD. We will 
consider all comments received by the closing date and may amend the 
proposed AD in light of those comments.
    We will post all comments we receive, without change, to https://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact 
with FAA personnel concerning this proposed AD. Using the search 
function of the Web site, anyone can find and read the comments in any 
of our dockets, including, if provided, the name of the individual who 
sent the comment (or signed the comment on behalf of an association, 
business, labor union, etc.). You may review the DOT's complete Privacy 
Act Statement in the Federal Register published on April 11, 2000 (65 
FR 19477-78).

Examining the AD Docket

    You may examine the AD docket on the Internet at https://www.regulations.gov; or in person at the Docket Operations office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Operations office (telephone (800) 647-5527) is 
the same as the Mail address provided in the ADDRESSES section. 
Comments will be available in the AD docket shortly after receipt.

Discussion

    We proposed to amend 14 CFR part 39 by superseding AD 2007-07-07R1, 
Amendment 39-15179 (72 FR 49183, August 28, 2007). That AD requires a 
onetime inspection of certain fan disks for electrical arc-out 
indications, replacing fan disks with electrical arc-out indications, 
and reducing the life limit of certain fan disks. That NPRM was 
prompted by us determining that we inadvertently left out an inspection 
requirement in Table C of AD 2007-07-07R1 to perform a shop inspection 
on disks that have greater than 6,000 flight hours and have already 
undergone a shop inspection. That condition, if not corrected, could 
result in an uncontained fan disk failure and airplane damage. On 
January 18, 2008, we published that proposal as an NPRM in the Federal 
Register (73 FR 3425). That NPRM would have required:
     Replacing certain fan disks installed on regional jets 
within 15 days after the effective date of the proposed AD, and
     On-wing and shop-level inspections of fan disks for 
electrical arc-out defects on fan disks installed on regional jets, and
     Shop-level inspections of fan disks for electrical arc-out 
defects on fan disks installed on business jets.
    Since we issued that NPRM, GE performed an updated risk analysis 
that shows we need to take corrective action that is more stringent 
than that proposed in the NPRM. We also propose to amend 14 CFR part 39 
by superseding AD 2007-05-16, Amendment 39-14977 (72 FR 10054, March 7, 
2007). That AD requires a onetime visual and tactile inspection of 
certain areas of certain P/N and SN fan disks for an arc-out defect, 
within 20 engine flight hours after the effective date of that AD. 
Since we issued that AD, GE has added those SN fan disks to the 
applicable service bulletins for the repetitive inspection requirements 
of this proposed AD.
    Since these changes expand the scope of the originally proposed 
rule, we have determined that it is necessary to reopen the comment 
period to provide additional opportunity for public comment. This 
condition, if not corrected, could result in an uncontained failure of 
the fan disk and damage to the airplane.

[[Page 17800]]

Relevant Service Information

    We have reviewed and approved the technical contents of GE Alert 
Service Bulletins (ASBs) No. CF34-BJ S/B 72-A0212, Revision 04, dated 
October 27, 2008; CF34-BJ S/B 72-A0234, dated October 27, 2008; CF34-BJ 
S/B 72-A0235, dated October 27, 2008; CF34-AL S/B 72-A0233, Revision 
04, dated October 27, 2008; CF34-AL S/B 72-A0252, dated October 27, 
2008; and CF34-AL S/B 72-A0253, dated October 27, 2008. These ASBs list 
the affected fan disks by serial number, part number, and tier, and 
describe procedures for performing TEV inspections, FPI, and ECI for 
cracks and electrical arc-out defects.

FAA's Determination and Requirements of the Proposed AD

    We have evaluated all pertinent information and identified an 
unsafe condition that is likely to exist or develop on other products 
of this same type design. We are proposing this AD, which would require 
initial and repetitive FPI, ECI, and TEV inspections. The proposed AD 
would require you to use the service information described previously 
to perform these actions.

Costs of Compliance

    We estimate that this proposed AD would affect 1,531 engines 
installed on airplanes of U.S. registry. We also estimate that it would 
take about 2 work-hours per engine to perform the proposed on-wing 
inspection on 300 engines, and 4 work-hours per engine to perform the 
proposed shop inspection on 1,531 engines. The average labor rate is 
$80 per work-hour. There are no required parts. Based on these figures, 
we estimate the total cost of the proposed AD to U.S. operators to be 
$537,920.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
subtitle VII, part A, subpart III, section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would not 
have a substantial direct effect on the States, on the relationship 
between the national Government and the States, or on the distribution 
of power and responsibilities among the various levels of government.
    For the reasons discussed above, I certify that the proposed AD:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Would not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this proposed AD. You may get a copy of this summary at the 
address listed under ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Proposed Amendment

    Under the authority delegated to me by the Administrator, the 
Federal Aviation Administration proposes to amend 14 CFR part 39 as 
follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

    2. The FAA amends Sec.  39.13 by removing Amendment 39-14977 (72 FR 
10054, March 7, 2007) and Amendment 39-15179 (72 FR 49183, August 28, 
2007), and by adding a new airworthiness directive to read as follows:

General Electric Company: Docket No. FAA-2007-27687; Directorate 
Identifier 2000-NE-42-AD.

Comments Due Date

    (a) The Federal Aviation Administration (FAA) must receive 
comments on this airworthiness directive (AD) action by June 16, 
2009.
    (b) This AD supersedes AD 2007-05-16, Amendment 39-14977 and AD 
2007-07-07R1, Amendment 39-15179.

Applicability

    (c) 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.

Unsafe Condition

    (d) This AD results from an updated risk analysis by GE that 
shows we need to take corrective action that is more stringent. We 
are issuing this AD to prevent an uncontained failure of the fan 
disk, which could result in damage to the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified unless the 
actions have already been done.

Removing Certain Fan Disks from Service

    (f) For fan disks listed by P/N and serial number (SN) in Table 
2 of GE Alert Service Bulletin (ASB) CF34-BJ S/B 72-A0212, Revision 
04, dated October 27, 2008; or in Table 2 of GE ASB CF34-AL S/B 72-
A0233, Revision 04, dated October 27, 2008 that have 8,000 CSN or 
more on the effective date of this AD, remove fan disks from service 
within 15 days after the effective date of this AD.
    (g) For fan disks listed by P/N and serial number (SN) in Table 
2 of GE Alert Service Bulletin (ASB) CF34-BJ S/B 72-A0212, Revision 
04, dated October 27, 2008; or in Table 2 of GE ASB CF34-AL S/B 72-
A0233, Revision 04, dated October 27, 2008, that have fewer than 
8,000 CSN on the effective date of this AD, remove fan disks from 
service before accumulating 8,000 CSN.

Inspections of Tier 1 Fan Disks

    (h) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02, 
and airworthiness limitation section life limit of 22,000 CSN, and 
CF34-3B1 turbofan engines with Tier 1 fan disks listed by P/N, SN, 
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, 
dated October 27, 2008, do the following:

Tactile and Enhanced Visual (TEV) Inspections, Fluorescent Penetrant 
Inspections (FPI), and Eddy Current Inspections (ECI)

    (1) For Tier 1 fan disks not already inspected using GE ASB No. 
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier 
issue, do the following:
    (i) Perform a TEV inspection, an FPI, and an ECI on the Tier 1 
fan disks within 650 cycles-in-service (CIS) after the effective 
date of this AD. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0233, Revision 04, dated

[[Page 17801]]

October 27, 2008, to perform the TEV inspection, FPI, and ECI.
    (ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks 
within intervals of 3,000 cycles-since-last inspection (CSLI). Use 
paragraph 3.A of the Accomplishment Instructions of GE ASB CF34-AL 
S/B 72-A0252, dated October 27, 2008, to perform the repetitive ECI.
    (2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27, 
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233, 
Revision 03, dated June 27, 2007, or earlier issue, do the 
following:
    (i) For Tier 1 fan disks with 2,500 or more CSLI on the 
effective date of this AD, perform an ECI on the Tier 1 fan disks 
within 500 CIS after the effective date of this AD. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the ECI.
    (ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the 
effective date of this AD, perform an ECI on the Tier 1 fan disks 
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0252, dated October 27, 2008, 
to perform the ECI.
    (iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0252, dated 
October 27, 2008, to perform the repetitive ECI.

Inspections of Tier 2 Fan Disks

    (i) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02, 
and airworthiness limitation section life limit of 22,000 CSN, and 
CF34-3B1 turbofan engines with Tier 2 fan disks listed by P/N, SN, 
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, 
dated October 27, 2008, do the following:

TEV Inspections, FPI, and ECI

    (1) For Tier 2 fan disks not already inspected using GE ASB No. 
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier 
issue, do the following:
    (i) Perform a TEV inspection, an FPI, and an ECI on the Tier 2 
fan disks within 2,000 CIS after the effective date of this AD, or 
within 5,000 CIS after September 12, 2007, or by March 19, 2012, 
whichever occurs first. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0233, Revision 04, dated 
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
    (ii) Thereafter, perform repetitive eddy current inspections on 
the Tier 2 fan disks within intervals of 3,000 CSLI. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the repetitive ECI.
    (2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27, 
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233, 
Revision 03, dated June 27, 2007, or earlier issue, do the 
following:
    (i) For Tier 2 fan disks with 2,500 or more CSLI on the 
effective date of this AD, perform an ECI on the Tier 2 fan disks 
within 500 CIS after the effective date of this AD. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-AL S/B 72-
A0252, dated October 27, 2008, to perform the ECI.
    (ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the 
effective date of this AD, perform an ECI on the Tier 2 fan disks 
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0252, dated October 27, 2008, 
to perform the ECI.
    (iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0252, dated 
October 27, 2008, to perform the repetitive ECI.

Inspections of Tier 3 Fan Disks

    (j) For CF34-3A1 engines with fan drive shaft, P/N 6036T78P02, 
and airworthiness limitation section life limit of 22,000 CSN, and 
CF34-3B1 turbofan engines with Tier 3 fan disks, listed by P/N, SN, 
and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, 
dated October 27, 2008, do the following:

TEV Inspections, FPI, and ECI

    (1) For Tier 3 fan disks not already inspected using GE ASB No. 
CF34-AL S/B 72-A0233, Revision 03, dated June 27, 2007, or earlier 
issue, perform a TEV inspection, an FPI, and an ECI on the Tier 3 
fan disks within 5,000 CIS after September 12, 2007, or by March 19, 
2012, whichever is earlier. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0253, Revision 04, dated 
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
    (2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-AL S/B 72-A0233, Revision 04, dated October 27, 
2008; already inspected using GE ASB No. CF34-AL S/B 72-A0233, 
Revision 03, dated June 27, 2007, or earlier issue, perform a TEV 
inspection and an ECI on the Tier 3 fan disks at the next shop 
visit. Use paragraph 3.A of the Accomplishment Instructions of GE 
ASB CF34-AL S/B 72-A0253, dated October 27, 2008, to perform the TEV 
inspection and ECI.
    (3) Repetitive ECI on the Tier 3 fan disks are not required.

Inspections of Tier 1 Fan Disks

    (k) For CF34-1A turbofan engines with fan drive shaft, P/N 
6036T78P02, and airworthiness limitation section life limit of 
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with 
Tier 1 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB 
No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 2008, do 
the following:

TEV Inspections, FPI, and ECI

    (1) For Tier 1 fan disks not already inspected using GE ASB No. 
CF34-BJ S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier 
issue:
    (i) Perform a TEV inspection, FPI, and ECI on the Tier 1 fan 
disks within 350 CIS after the effective date of this AD. Use 
paragraph 3.A of the Accomplishment Instructions of GE ASB CF34-BJ 
S/B 72-A0212, Revision 04, dated October 27, 2008, to perform the 
TEV inspection.
    (ii) Thereafter, perform repetitive ECI on the Tier 1 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated 
October 27, 2008, to perform the repetitive ECI.
    (2) For Tier 1 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 
2008; already inspected using GE ASB No. CF34-BJ S/B 72-A0212, 
Revision 03, dated June 27, 2007, or earlier issue, do the 
following:
    (i) For Tier 1 fan disks with 2,500 or more CSLI on the 
effective date of this AD, perform an ECI on the Tier 1 fan disks 
within 500 CIS after the effective date of this AD. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
    (ii) For Tier 1 fan disks with fewer than 2,500 CSLI on the 
effective date of this AD, perform an ECI on the Tier 1 fan disks 
within 3,000 CSLI after the effective date of this AD. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
    (iii) Thereafter, perform repetitive ECI on the Tier 1 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-AL S/B 72-A0235, dated 
October 27, 2008, to perform the repetitive ECI.

Inspections of Tier 2 Fan Disks

    (l) For CF34-1A turbofan engines with fan drive shaft, P/N 
6036T78P02, and airworthiness limitation section life limit of 
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with 
Tier 2 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB 
No. CF34-AL S/B 72-A0212, Revision 04, dated October 27, 2008, do 
the following:

TEV Inspections, FPI, and ECI

    (1) For Tier 2 fan disks not already inspected using GE ASB No. 
CF34-AL S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier 
issue, do the following:
    (i) Perform a TEV inspection, FPI, and ECI on the Tier 2 fan 
disks within 2,000 CIS after the effective date of this AD, or 
within 3,500 CIS after September 12, 2007, or by March 19, 2012, 
whichever occurs first. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-BJ S/B 72-A0212, Revision 04, dated 
October 27, 2008, to perform the TEV inspection, FPI, and ECI.
    (ii) Thereafter, perform repetitive ECI on the Tier 2 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated 
October 27, 2008, to perform the repetitive ECI.
    (2) For Tier 2 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 
2008; already inspected using GE ASB

[[Page 17802]]

No. CF34-BJ S/B 72-A0212, Revision 03, dated June 27, 2007, or 
earlier issue, do the following:
    (i) For Tier 2 fan disks with 2,500 or more CSLI on the 
effective date of this AD, perform an ECI on the Tier 2 fan disks 
within 500 CIS after the effective date of this AD. Use paragraph 
3.A of the Accomplishment Instructions of GE ASB CF34-BJ S/B 72-
A0235, dated October 27, 2008, to perform the ECI.
    (ii) For Tier 2 fan disks with fewer than 2,500 CSLI on the 
effective date of this AD, perform an ECI on the Tier 2 fan disks 
within 3,000 CSLI. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-BJ S/B 72-A0235, dated October 27, 2008, 
to perform the ECI.
    (iii) Thereafter, perform repetitive ECI on the Tier 2 fan disks 
within intervals of 3,000 CSLI. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0235, dated 
October 27, 2008, to perform the repetitive ECI.

Inspections of Tier 3 Fan Disks

    (m) For CF34-1A turbofan engines with fan drive shaft, P/N 
6036T78P02, and airworthiness limitation section life limit of 
15,000 CSN, CF34-3A, CF34-3A2, and CF34-3B turbofan engines with 
Tier 3 fan disks listed by P/N, SN, and Tier in Table 1 of GE ASB 
No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 2008, do 
the following:

TEV Inspections, FPI, and ECI

    (1) For Tier 3 fan disks not already inspected using GE ASB No. 
CF34-AL S/B 72-A0212, Revision 03, dated June 27, 2007, or earlier 
issue, perform a TEV inspection, FPI, and ECI on the Tier 3 fan 
disks within 3,500 CIS after September 12, 2007, or by March 19, 
2012, whichever is earlier. Use paragraph 3.A of the Accomplishment 
Instructions of GE ASB CF34-AL S/B 72-A0234, dated October 27, 2008, 
to perform the TEV inspection, FPI, and ECI.
    (2) For Tier 3 fan disks, listed by P/N, SN, and Tier in Table 1 
of GE ASB No. CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 
2008; already inspected using GE ASB No. CF34-BJ S/B 72-A0212, 
Revision 03, dated June 27, 2007, or earlier issue, perform a TEV 
inspection and an ECI on the Tier 3 fan disks within 3,500 CSLI, but 
no later than March 19, 2012. Use paragraph 3.A of the 
Accomplishment Instructions of GE ASB CF34-BJ S/B 72-A0234, dated 
October 27, 2008, to perform the TEV inspection and ECI.
    (3) Repetitive ECI on the Tier 3 fan disks are not required.

Alternative Methods of Compliance

    (n) The Manager, Engine Certification Office, has the authority 
to approve alternative methods of compliance for this AD if 
requested using the procedures found in 14 CFR 39.19.

Mandatory Terminating Action

    (o) Remove from service, Tier 1 and Tier 2 fan disks listed by 
P/N, SN, and Tier in Table 1 of GE ASB No. CF34-AL S/B 72-A0233, 
Revision 04, dated October 27, 2008; or CF34-BJ S/B 72-0212, 
Revision 04, dated October 27, 2008, before they exceed their 
limited life cycles or September 30, 2018, whichever occurs first.

Related Information

    (p) Contact Tara Chaidez, Aerospace Engineer, Engine 
Certification Office, FAA, Engine and Propeller Directorate, 12 New 
England Executive Park, Burlington, MA 01803; e-mail: 
tara.chaidez@faa.gov; telephone (781) 238-7773; fax (781) 238-7199, 
for more information about this AD.
    (q) The following GE Alert Service Bulletins pertain to the 
subject of this AD:
     CF34-AL S/B 72-A0233, Revision 04, dated October 27, 
2008,
     CF34-AL S/B 72-A0252, dated October 27, 2008,
     CF34-AL S/B 72-A0253, dated October 27, 2008,
     CF34-BJ S/B 72-A0212, Revision 04, dated October 27, 
2008,
     CF34-BJ S/B 72-A0234, dated October 27, 2008, and
     CF34-BJ S/B 72-A0235, dated October 27, 2008.
    Contact General Electric Company via Lockheed Martin Technology 
Services, 10525 Chester Road, Suite C, Cincinnati, Ohio 45215; 
telephone (513) 672-8400; fax (513) 672-8422, for a copy of this 
service information.

    Issued in Burlington, Massachusetts, on April 9, 2009.
Peter A. White,
Assistant Manager, Engine and Propeller Directorate, Aircraft 
Certification Service.
[FR Doc. E9-8787 Filed 4-16-09; 8:45 am]
BILLING CODE 4910-13-P
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