[Federal Register Volume 63, Number 30 (Friday, February 13, 1998)] [Proposed Rules] [Pages 7322-7324] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 98-3639] ======================================================================= ----------------------------------------------------------------------- DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 97-CE-96-AD] RIN 2120-AA64 Airworthiness Directives; Cessna Aircraft Company Model 172R Airplanes AGENCY: Federal Aviation Administration, DOT. ACTION: Notice of proposed rulemaking (NPRM). ----------------------------------------------------------------------- SUMMARY: This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Cessna Aircraft Company Model 172R airplanes. The proposed action would require modifying lower forward doorpost bulkhead by installing rivets. The proposed AD is the result of a report from the manufacturer that these rivets were erroneously omitted during manufacture of some of the new production airplanes. The actions specified by the proposed AD are intended to prevent reduced structural rigidity at the forward doorpost bulkhead, which, if not corrected, could result in structural cracking and possible loss of control of the airplane. [[Page 7323]] DATES: Comments must be received on or before April 24, 1998. ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 97-CE-96-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Comments may be inspected at this location between 8 a.m. and 4 p.m., Monday through Friday, holidays excepted. Service information that applies to the proposed AD may be obtained from The Cessna Aircraft Company, P.O. Box 7706, Wichita, Kansas 67277, telephone (316) 941-7550, facsimile (316) 942-9008. This information also may be examined at the Rules Docket at the address above. FOR FURTHER INFORMATION CONTACT: Mr. Eual Conditt, Senior Aerospace Engineer, Wichita Aircraft Certification Office, 1801 Airport Road, Rm. 100, Mid-Continent Airport, Wichita, Kansas, 67209, telephone (316) 946-4128; facsimile (316) 946-4407. SUPPLEMENTARY INFORMATION: Comments Invited Interested persons are invited to participate in the making of the proposed rule by submitting such written data, views, or arguments as they may desire. Communications should identify the Rules Docket number and be submitted in triplicate to the address specified above. All communications received on or before the closing date for comments, specified above, will be considered before taking action on the proposed rule. The proposals contained in this notice may be changed in light of the comments received. Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the proposed rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report that summarizes each FAA-public contact concerned with the substance of this proposal will be filed in the Rules Docket. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: ``Comments to Docket No. 97-CE-96-AD.'' The postcard will be date stamped and returned to the commenter. Availability of NPRMs Any person may obtain a copy of this NPRM by submitting a request to the FAA, Central Region, Office of the Regional Counsel, Attention: Rules Docket No. 97-CE-96-AD, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Discussion Cessna Aircraft Company (Cessna) notified the FAA of an airplane manufacturing error where some rivets were mistakenly omitted from the lower forward doorpost on both sides of several new production Cessna Model 172R airplanes. The rivets omitted are in an area of the airframe (bulkhead and attaching doublers), which is considered critical structure. The bulkhead and attaching doubler receive landing loads from the wing and flight loads through the lift strut attachment and wing. Relevant Service Information Cessna has issued Service Bulletin (SB) SB97-53-02, dated September 15, 1997, which specifies procedures for modifying the lower forward doorpost bulkhead on both sides of the airplane by installing doorpost rivets. The FAA's Determination After examining the circumstances and reviewing all available information related to the incidents described above, the FAA has determined that AD action should be taken to prevent reduced structural rigidity at the forward doorpost bulkhead, which, if not corrected, could result in structural cracking and possible loss of control of the airplane. Explanation of the Provisions of the Proposed AD Since an unsafe condition has been identified that is likely to exist or develop in other Cessna Model 172R airplanes of the same type design, the proposed AD would require modifying the lower forward doorpost bulkhead on both sides of the affected model airplanes by installing rivets. Accomplishment of the proposed AD would be in accordance with Cessna Service Bulletin No. SB97-53-02, dated September 15, 1997. Cost Impact The FAA estimates that 87 airplanes in the U.S. registry would be affected by the proposed AD, that it would take approximately 14 workhours per airplane to accomplish the proposed action, and that the average labor rate is approximately $60 an hour. Parts cost approximately $150 per airplane. Based on these figures, the total cost impact of the proposed AD on U.S. operators is estimated to be $86,130 or $990 per airplane. These figures would not apply if the owners/ operators were to accomplish the proposed action prior to May 15, 1998, which is the deadline for warranty credit stated in the service bulletin. The FAA would assume that none of the owners/operators of the affected airplanes have already accomplished this action. Regulatory Impact The regulations proposed herein would 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 proposal would 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) if promulgated, 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 copy of the draft regulatory evaluation prepared for this action has been placed in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption ADDRESSES. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend 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. [[Page 7324]] Sec. 39.13 [Amended] 2. Section 39.13 is amended by adding a new airworthiness directive (AD) to read as follows: Cessna Aircraft Company: Docket No. 97-CE-96-AD. Applicability: Model 172R airplanes (serial numbers 17280004 through 17280016, 17280018 through 17280050, 17280052 through 17280058, 17280060 through 17280062, 17280064, 17280066 through 17280082, 17280085 through 17280099, 17280101 through 17280113, 17280115, 17280116, 17280118 through 17280125, 17280128 through 17280131, and 17280138), certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Required within the next 100 hours time-in-service (TIS) after the effective date of this AD, unless already accomplished. To prevent reduced structural rigidity at the lower forward doorpost bulkhead, which if not corrected could result in structural cracking and possible loss of control of the airplane, accomplish the following: (a) Modify the lower forward doorpost of the affected airplanes by installing the specified rivets in accordance with Cessna Aircraft Company Service Bulletin (SB) No. SB97-53-02, dated September 15, 1997. (b) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, 1801 Airport Road, Rm. 100, Mid-Continent Airport, Wichita, Kansas, 67209. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita Aircraft Certification Office. (d) All persons affected by this directive may obtain copies of the document referred to herein upon request to The Cessna Aircraft Company, P. O. Box 7706, Wichita, Kansas 67277; or may examine this document at the FAA, Central Region, Office of the Regional Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. Issued in Kansas City, Missouri, on February 6, 1998. Michael Gallagher, Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-3639 Filed 2-12-98; 8:45 am] BILLING CODE 4910-13-P