AD 89-23-06 R1

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) by revising AD 89-23-06, Amendment 39-6370 (54 FR 43581, October 26, 1989), which is applicable to CFM International (CFMI) CFM56-2, -3, -3B, -3C, and -5 series turbofan engines, was published in the Federal Register on September 19, 1997 (62 FR 49177). That action proposed to require removing the requirement for magnetic chip detector (MCD) inspections for certain No. 3 bearings if the bearing has 6,000 or more hours time in service since new, extending the removal from service date for certain No. 3 bearings, changing the inspection interval for certain No. 3 bearings, deleting a specific No. 3 bearing part number, and replacing reference to specific maintenance manuals with service bulletins. Other requirements of the current AD remain unchanged and are carried over into this revised AD.

Interested persons have been afforded an opportunity to participate in the makingof this amendment. Two comments were received from air carriers, both of which support the rule as proposed. No comments were received on the FAA's determination of the cost to the public.

The FAA has revised paragraphs (a)(2) and (b)(2) of this AD in order to more accurately define an "affected No. 3 bearing." In addition, the FAA has revised paragraph (h) of this AD in order to more accurately define a "shop visit". Lastly, the FAA has added paragraph (g) in the AD to clarify what constitutes terminating action to the inspections required by the AD.

The FAA has also revised the calendar end-date in paragraphs (a)(2) and (b)(2) of this AD to January 31, 1998, based upon the anticipated effective date of this AD.

All changes introduced in this revised AD are relaxatory in nature except for the new inspection interval in paragraph (d). The manufacturer has advised the FAA that there is only one engine, not installed on a U.S. registered aircraft, that is affected bythis new inspection interval. Therefore, no additional cost to U.S. operators is expected to result from this relaxatory action. In addition, since no U.S. operators will be affected by the new inspection interval a situation exists that allows the immediate adoption of this regulation. Therefore, it is found that good cause exists for making this amendment effective in less than 30 days following publication.

The regulations adopted herein will not have substantial direct effects 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. Therefore, in accordance with Executive Order 12612, it is determined that this final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment.

For the reasons discussed above, I certify that this action (1) is not a "significant regulatory action" under Executive Order 12866; (2) is not a "significant rule" under 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. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption "ADDRESSES."

List of Subjects in 14 CFR Part 39 Air Transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Adoption of the Amendment Accordingly, pursuant to 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. 39.13 [Amended] 2. Section 39.13 is amended by removing Amendment 39-6370 (54 FR 43581, October 26, 1989) and by adding a new airworthiness directive, Amendment 39-10290, to read as follows: