On March 19, 2003, the FAA issued AD 97-09- 02R2, Amendment 39-13094 (68 FR 14312, March 25, 2003). That AD reduces the LCF retirement lives of certain HPTR front shafts, HPTR front air seals, HPTR disks, booster spools, and LPTR stage 3 disks.
Actions Since AD 97-09-02R2 Was Issued
After we issued AD 97-09-02R2, the manufacturer conducted an extensive life management program for the HPTR front shaft and booster spool listed in the AD. The results indicated higher LCF retirement lives for those HPTR front shafts and booster spools than the lives published in AD 97-09-02R2. Those LCF retirement lives are now the same as originally calculated and are in agreement with the current airworthiness limitations section of Chapter 05 of the CFM56-5C Engine Shop Manual, CFMI-TP.SM.8. This AD revision removes HPTR front shafts, part numbers (P/Ns) 1498M40P03, 1498M40P05, and 1498M40P06; and booster spools, P/N 337-005-210-0, from the parts listed with lower LCFretirement lives. The LCF retirement lives of the HPTR front air seals P/N 1523M34P02 and 1523M34P03 remain unchanged.
FAA's Determination and Requirements of This AD
Although no airplanes that are registered in the United States use these affected engine models, the possibility exists these engine models could be used on airplanes that are registered in the United States in the future. This AD requires the LCF retirement lives of HPTR front air seals P/N 1523M34P02 and P/N 1523M34P03 to remain as published in AD 97-09-02R2.
FAA's Determination of the Effective Date
Since there are currently no domestic operators of this engine model, notice and opportunity for public comment before issuing this AD are unnecessary, and a situation exists that allows the immediate adoption of this regulation.
Comments Invited
This AD is a final rule that involves requirements affecting flight safety and was not preceded by notice and an opportunity for public comment; however, we invite you to submit any written relevant data, views, or arguments regarding this AD. Send your comments to an address listed under ADDRESSES. Include "AD Docket No. 95-ANE-64-AD" in the subject line of your comments. If you want us to acknowledge receipt of your mailed comments, send us a self-addressed, stamped postcard with the docket number written on it; we will date-stamp your postcard and mail it back to you. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify it. If a person contacts us verbally, and that contact relates to a substantive part of this AD, we will summarize the contact and place the summary in the docket. We will consider all comments received by the closing date and may amend the AD in light of those comments.
We are reviewing the writing style we currently use in regulatory documents. We are interested in your comments on whether the style of this document is clear, and your suggestions to improve the clarity of our communications with you. You may get more information about plain language at http://www.faa.gov/language and http://www.plainlanguage.gov.
Examining the AD Docket
You may examine the AD Docket (including any comments and service information), by appointment, between 8 a.m. and 4:30 p.m., Monday through Friday, except Federal holidays. See ADDRESSES for the location.
Regulatory Findings
We have determined that this AD will not have federalism implications under Executive Order 13132. This AD will 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 regulation:
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. Will 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 summary of the costs to comply with this AD and placed it in the AD Docket. You may get a copy of this summary by sending a request to us at the address listed under ADDRESSES. Include "AD Docket No. 95-ANE-64-AD" in your request.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
Adoption of the Amendment
Accordingly, under the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (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 39-13094 68 FR 14312, March 25, 2003, and by adding a new airworthiness directive, Amendment 39-13791, to read as follows: