Airworthiness Directives; Cessna Aircraft Company Models 525, 525A, and 525B Airplanes, 60790-60793 [E7-21127]

Download as PDF 60790 Proposed Rules Federal Register Vol. 72, No. 207 Friday, October 26, 2007 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service 7 CFR Part 319 [Docket No. 03–002–5] RIN 0579–AC55 Importation of Nursery Stock; Postentry Quarantine Requirements for Potential Hosts of Chrysanthemum White Rust and Definition of From Animal and Plant Health Inspection Service, USDA. ACTION: Proposed rule; reopening of comment period. rmajette on PROD1PC64 with PROPOSALS AGENCY: SUMMARY: We are reopening the comment period for our proposed rule that would amend the regulations on importing nursery stock by providing a new option for the postentry quarantine growing period for articles of Chrysanthemum spp., Leucanthemella serotina, and Nipponanthemum nipponicum and amending the definition of from. This action will allow interested persons additional time to prepare and submit comments. DATES: We will consider all comments that we receive on or before November 26, 2007. ADDRESSES: You may submit comments by either of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov, select ‘‘Animal and Plant Health Inspection Service’’ from the agency drop-down menu, then click ‘‘Submit.’’ In the Docket ID column, select APHIS–2005– 0081 to submit or view public comments and to view supporting and related materials available electronically. Information on using Regulations.gov, including instructions for accessing documents, submitting comments, and viewing the docket after the close of the comment period, is available through the site’s ‘‘User Tips’’ link. • Postal Mail/Commercial Delivery: Please send four copies of your VerDate Aug<31>2005 14:41 Oct 25, 2007 Jkt 214001 comment (an original and three copies) to Docket No. 03–002–4, Regulatory Analysis and Development, PPD, APHIS, Station 3A–03.8, 4700 River Road Unit 118, Riverdale, MD 20737– 1238. Please state that your comment refers to Docket No. 03–002–4. Reading Room: You may read any comments that we receive on Docket No. 03–002–4 in our reading room. The reading room is located in room 1141 of the USDA South Building, 14th Street and Independence Avenue, SW., Washington, DC. Normal reading room hours are 8 a.m. to 4:30 p.m., Monday through Friday, except holidays. To be sure someone is there to help you, please call (202) 690–2817 before coming. Other Information: Additional information about APHIS and its programs is available on the Internet at http://www.aphis.usda.gov. FOR FURTHER INFORMATION CONTACT: Dr. Arnold T. Tschanz, Senior Import Specialist, Commodity Import Analysis and Operations, PPQ, APHIS, 4700 River Road Unit 133, Riverdale, MD 20737–1236; (301) 734–5306. SUPPLEMENTARY INFORMATION: On August 8, 2007, we published in the Federal Register (72 FR 44425–44433, Docket No. 03–002–4) a proposed rule that would amend the regulations on importing nursery stock by providing an option in which the postentry quarantine growing period for articles of Chrysanthemum spp., Leucanthemella serotina, and Nipponanthemum nipponicum that are imported from certain locations would be reduced from 6 months to 2 months, provided that the grower of those plants has implemented a systems approach to prevent the imported articles from being infected with chrysanthemum white rust. The proposed rule would also amend the definition of from. Comments on the proposed rule were required to be received on or before October 9, 2007. We are reopening the comment period on Docket No. 03–002– 4 until November 26, 2007. This action will allow interested persons additional time to prepare and submit comments. We will also consider all comments received between October 9, 2007, and the date of this notice. Authority: 7 U.S.C. 450, 7701–7772, and 7781–7786; 21 U.S.C. 136 and 136a; 7 CFR 2.22, 2.80, and 371.3. PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 Done in Washington, DC, this 22nd day of October 2007. Kevin Shea, Acting Administrator, Animal and Plant Health Inspection Service. [FR Doc. E7–21136 Filed 10–25–07; 8:45 am] BILLING CODE 3410–34–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2007–28956; Directorate Identifier 2007–CE–068–AD] RIN 2120–AA64 Airworthiness Directives; Cessna Aircraft Company Models 525, 525A, and 525B Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Notice of proposed rulemaking (NPRM). AGENCY: SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) Models 525, 525A, and 525B airplanes. This proposed AD would require you to inspect the lower wing skin structure, forward wing spar, lower fuselage skin, fairings, and the external fairing frames for corrosion; repair any damage found; apply a corrosion inhibitive sealant to the fuselage fairings before reinstalling; and disable the cockpit mounted pilot relief tube. This proposed AD results from leaking of the cockpit mounted pilot relief tube, which caused corrosion of the airplane structure. We are proposing this AD to detect and correct any damage from corrosion of the airplane structure. Corrosion of the airplane structure could cause structural degradation and lead to structural failure of the airplane with consequent loss of control. DATES: We must receive comments on this proposed AD by December 26, 2007. Use one of the following addresses to comment on this proposed AD: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: (202) 493–2251. ADDRESSES: E:\FR\FM\26OCP1.SGM 26OCP1 60791 Federal Register / Vol. 72, No. 207 / Friday, October 26, 2007 / Proposed Rules • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Cessna Aircraft Company, Citation Marketing Division, P.O. 7706, Wichita, Kansas 67277; telephone: 1–800–835–4090; fax: 1–800–517–8500. FOR FURTHER INFORMATION CONTACT: T.N. Baktha, Aerospace Engineer, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946– 4155; fax: (316) 946–4107. SUPPLEMENTARY INFORMATION: www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive concerning this proposed AD. Comments Invited We invite you to send any written relevant data, views, or arguments regarding this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include the docket number, ‘‘FAA–2007–28956; Directorate Identifier 2007–CE–068–AD’’ at the beginning 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 http:// We have reviewed the following Cessna service information for this AD: • Service Bulletin SB525–53–20, dated April 30, 2007; • Service Bulletin SB525A–53–01, dated April 30, 2007; • Service Bulletin SB525B–53–01, dated April 30, 2007; • Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; • Alert Service Letter ASL525A–53– 05, Revision 2, dated July 25, 2007; and • Alert Service Letter ASL525B–53– 02, Revision 2, dated July 25, 2007. The service information describes procedures for the following actions: • Inspecting the lower wing skin structure, forward wing spars, lower Discussion Cessna reported wing skin corrosion in a Model 525 and belly skin corrosion in several Model 525A airplanes. Cessna received information on more than 18 cases of significant corrosion. Cessna also received information on 42 cases of some corrosion on Models 525, 525A, and 525B airplanes. Corrosive fluids leaked after use of the cockpit mounted pilot relief tube and caused corrosion of the fuselage skins, fairings, fairing support structure, and wing structure. This condition, if not corrected, could result in structural degradation and lead to structural failure of the airplane with consequent loss of control. Relevant Service Information fuselage skin, fairings, and external fairing frames for corrosion; • Repairing corrosion by blending within specified limits or by contacting the manufacturer to obtain an FAAapproved repair scheme if corrosion damage can not be repaired within the limits specified; • Doing a surface eddy current inspection or a dye-penetrant inspection on the repaired blended areas for cracks, and contacting the manufacturer to obtain an FAA-approved repair scheme if cracks are found; • Applying a corrosion inhibitive sealant to the fuselage fairings before reinstalling; and • Disabling the cockpit mounted relief tube. FAA’s Determination and Requirements of the Proposed AD We are proposing this AD because we evaluated all information and determined the unsafe condition described previously is likely to exist or develop on other products of the same type design. This proposed AD would require you to inspect the lower wing skin structure, forward wing spar, lower fuselage skin, fairings, and the external fairing frames for corrosion; repair any damage found; apply a corrosion inhibitive sealant to the fuselage fairings before reinstalling; and disable the cockpit mounted pilot relief tube. Costs of Compliance We estimate that this proposed AD would affect 261 airplanes in the U.S. registry. We estimate the following costs to do the proposed inspection: Total cost per airplane Labor cost Parts cost 80 work-hours × $80 per hour = $6,400 ................................................... Not Applicable ................................. We have no way of determining the number of airplanes that may need repair or further inspection based on the results of the proposed inspection, or the costs associated with such repair or inspection. rmajette on PROD1PC64 with PROPOSALS .5 work-hours × $80 per hour = $40 ......................................................... Not Applicable ................................. VerDate Aug<31>2005 14:41 Oct 25, 2007 Jkt 214001 Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 $1,670,400 Total cost per airplane Parts cost ASL525A–53–05, Revision 2, dated July 25, 2007; and Alert Service Letter ASL525B–53–02, Revision 2, dated July 25, 2007. $6,400 We estimate the following costs to do the proposed disabling of the cockpit mounted pilot relief tube: Labor cost Cessna will provide warranty credit to the extent specified in Cessna Citation Service Bulletin SB525–53–20, dated April 30, 2007; Service Bulletin SB525A–53–01, dated April 30, 2007; Service Bulletin SB525B–53–01, dated April 30, 2007; Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; Alert Service Letter Total cost on U.S. operators Total cost on U.S. operators $40 $10,440 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 E:\FR\FM\26OCP1.SGM 26OCP1 60792 Federal Register / Vol. 72, No. 207 / Friday, October 26, 2007 / Proposed Rules 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 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 regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket. Examining the AD Docket You may examine the AD docket that contains the proposed AD, the regulatory evaluation, any comments received, and other information on the Internet at http://www.regulations.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 647–5527) is located at the street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA 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 Cessna Aircraft Company: Docket No. FAA– 2007–28956; Directorate Identifier 2007– CE–068–AD. Comments Due Date (a) We must receive comments on this airworthiness directive (AD) action by December 26, 2007. Affected ADs (b) None. Applicability (c) This AD applies to the following airplane models and serial numbers that have a cockpit mounted pilot relief tube installed and are certificated in any category: Models Serial Nos. (1) 525 ...................... (2) 525A .................... (3) 525B .................... 0001 through 0637. 0001 through 0347. 0001 through 0152. Unsafe Condition (d) This AD results from leaking of the pilot relief tube, which caused corrosion of the airplane structure. We are issuing this AD to detect and correct any damage from corrosion on the airplane structure. Corrosion of the airplane structure could cause structural degradation and lead to structural failure of the airplane with consequent loss of control. Compliance [Amended] 2. The FAA amends § 39.13 by adding the following new AD: (e) To address this problem, you must do the following, unless already done: Compliance Procedures (1) Inspect the lower wing skin structure, forward wing spars, lower fuselage skin, fairings, and external fairing frames for corrosion. rmajette on PROD1PC64 with PROPOSALS Actions Within the next 90 days after the effective date of this AD. (2) If corrosion damage is found in the lower wing skin structure, forward wing spars, lower fuselage skin, fairings, and external fairing frames during the inspection required in paragraph (e)(1) of this AD, repair as specified in the applicable service information. If the corrosion damage can not be repaired within the limits specified in the applicable service information, contact the manufacturer at 1–800–835–4090 for an FAA-approved repair scheme and incorporate this repair. (3) If corrosion on the lower wing skin structure, forward wing spars, and lower fuselage skin was repaired by blending within the limits specified in the service information, do a surface eddy current inspection or a dyepenetrant inspection for cracks. (4) If cracks are found during the surface eddy current inspection or the dye-penetrant inspection required in paragraph (e)(3) of this AD, contact the manufacturer for an FAA-approved repair scheme and incorporate this repair. Before further flight after the inspection required in paragraph (e)(1) of this AD. Follow Cessna Citation Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; Alert Service Letter ASL525A– 53–05, Revision 2, dated July 25, 2007; or Alert Service Letter ASL525B–53–02, Revision 2, dated July 25, 2007. Follow Cessna Citation Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; Alert Service Letter ASL525A– 53–05, Revision 2, dated July 25, 2007; or Alert Service Letter ASL525B–53–02, Revision 2, dated July 25, 2007. VerDate Aug<31>2005 14:41 Oct 25, 2007 Jkt 214001 Before further flight after the repair by blending was done as specified in paragraph (e)(2) of this AD. Before further flight after the inspection required in paragraph (e)(3) of this AD. PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 Follow Cessna Citation Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; Alert Service Letter ASL525A– 53–05, Revision 2, dated July 25, 2007; or Alert Service Letter ASL525B–53–02, Revision 2, dated July 25, 2007. Contact Cessna Aircraft Company, Citation Customer Support at 1–800–835–4090. E:\FR\FM\26OCP1.SGM 26OCP1 Federal Register / Vol. 72, No. 207 / Friday, October 26, 2007 / Proposed Rules 60793 Actions Compliance Procedures (5) Install the fuselage fairings and apply corrosion inhibitive sealant. Before further flight after the inspection required in paragraph (e)(1) of this AD if no corrosion was found; or before further flight after doing the repairs and inspections required in paragraphs (e)(2), (e)(3), and (e)(4) of this AD if corrosion or cracks were found. Within the next 90 days after the effective date of this AD. Follow Cessna Citation Alert Service Letter ASL525–53–04, Revision 2, dated August 19, 2007; Alert Service Letter ASL525A– 53–05, Revision 2, dated July 25, 2007; or Alert Service Letter ASL525B–53–02, Revision 2, dated July 25, 2007. SUMMARY: The EPA is proposing to approve, as part of the Michigan State Implementation Plan (SIP), Michigan’s June 29, 2007, request to revise recordkeeping and reporting requirements for abnormal conditions, start-up, shutdown, and malfunction of a source, process, or process equipment. The revised rule contains more specific and complete recordkeeping and reporting requirements than are currently approved into the SIP. DATES: Comments must be received on or before November 26, 2007. ADDRESSES: Submit your comments, identified by Docket ID No. EPA–R05– OAR–2007–0631, by one of the following methods: 1. http://www.regulations.gov: Follow the on line instructions for submitting comments. 2. E-mail: mooney.john@epa.gov. 3. Fax: (312) 886–5824. 4. Mail: John M. Mooney, Chief, Criteria Pollutant Section, Air Programs Branch (AR 18J), U.S. Environmental Protection Agency, 77 West Jackson Boulevard, Chicago, Illinois 60604. 5. Hand Delivery: John M. Mooney, Chief, Criteria Pollutant Section, Air Programs Branch (AR 18J), U.S. Environmental Protection Agency, 77 West Jackson Boulevard, Chicago, Illinois 60604. Such deliveries are only accepted during the Regional Office normal hours of operation, and special arrangements should be made for deliveries of boxed information. The Regional Office official hours of business are Monday through Friday, 8:30 a.m. to 4:30 p.m. excluding Federal holidays. Please see the direct final rule which is located in the Rules section of this Federal Register for detailed instructions on how to submit comments. FOR FURTHER INFORMATION CONTACT: Kathleen D’Agostino, Environmental Engineer, Criteria Pollutant Section, Air Programs Branch (AR–18J), U.S. Environmental Protection Agency, Region 5, 77 West Jackson Boulevard, Chicago, Illinois 60604, (312) 886–1767, dagostino.kathleen@epa.gov. SUPPLEMENTARY INFORMATION: In the Final Rules section of this Federal Register, EPA is approving the State’s SIP submittal as a direct final rule without prior proposal because the Agency views this as a noncontroversial submittal and anticipates no adverse comments. A detailed rationale for the approval is set forth in the direct final rule. If no adverse comments are received in response to this rule, no further activity is contemplated. If EPA receives adverse comments, the direct final rule will be withdrawn and all public comments received will be addressed in a subsequent final rule based on this proposed rule. EPA will not institute a second comment period. Any parties interested in commenting on this action should do so at this time. Please note that if EPA receives adverse comment on an amendment, paragraph, or section of this rule and if that provision may be severed from the remainder of the rule, EPA may adopt as final those provisions of the rule that are not the subject of an adverse comment. For additional information, see the direct final rule which is located in the Rules section of this Federal Register. (6) Determine the type of installation of the cockpit mounted pilot relief tube and disable the relief tube. Alternative Methods of Compliance (AMOCs) (f) The Manager, Wichita Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: T.N. Baktha, Wichita ACO, Aerospace Engineer, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946–4155; fax: (316) 946–4107. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Related Information (g) To get copies of the service information referenced in this AD, contact Cessna Aircraft Company, Citation Marketing Division, P.O. 7706, Wichita, Kansas 67277; telephone: 1– 800–835–4090; fax: 1–800–517–8500. To view the AD docket, go to U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12– 140, 1200 New Jersey Avenue, SE., Washington, DC 20590, or on the Internet at http://www.regulations.gov. The docket number is Docket No. FAA–2007–28956; Directorate Identifier 2007–CE–068–AD. Issued in Kansas City, Missouri, on October 22, 2007. James E. Jackson, Acting Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E7–21127 Filed 10–25–07; 8:45 am] BILLING CODE 4910–13–P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 52 rmajette on PROD1PC64 with PROPOSALS [EPA–R05–OAR–2007–0631; FRL–8486–5] Approval and Promulgation of Implementation Plans; Michigan; Recordkeeping and Reporting Requirements for Abnormal Conditions Environmental Protection Agency (EPA). ACTION: Proposed rule. AGENCY: VerDate Aug<31>2005 14:41 Oct 25, 2007 Jkt 214001 PO 00000 Frm 00004 Fmt 4702 Sfmt 4702 Cessna Citation Service Bulletin SB525–53– 20, dated April 30, 2007; Service Bulletin SB525A–53–01, dated April 30, 2007; or Service Bulletin SB525B–53–01, dated April 30, 2007. Dated: October 10, 2007. Walter W. Kovalick, Jr., Acting Regional Administrator, Region 5. [FR Doc. E7–20944 Filed 10–25–07; 8:45 am] BILLING CODE 6560–50–P ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 52 [EPA–R05–OAR–2007–0192; FRL–8486–7] Approval and Promulgation of Air Quality Implementation Plans; Michigan; Consumer Products Rule Environmental Protection Agency (EPA). AGENCY: E:\FR\FM\26OCP1.SGM 26OCP1

Agencies

[Federal Register Volume 72, Number 207 (Friday, October 26, 2007)]
[Proposed Rules]
[Pages 60790-60793]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-21127]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28956; Directorate Identifier 2007-CE-068-AD]
RIN 2120-AA64


Airworthiness Directives; Cessna Aircraft Company Models 525, 
525A, and 525B Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Cessna Aircraft Company (Cessna) Models 525, 525A, and 525B 
airplanes. This proposed AD would require you to inspect the lower wing 
skin structure, forward wing spar, lower fuselage skin, fairings, and 
the external fairing frames for corrosion; repair any damage found; 
apply a corrosion inhibitive sealant to the fuselage fairings before 
reinstalling; and disable the cockpit mounted pilot relief tube. This 
proposed AD results from leaking of the cockpit mounted pilot relief 
tube, which caused corrosion of the airplane structure. We are 
proposing this AD to detect and correct any damage from corrosion of 
the airplane structure. Corrosion of the airplane structure could cause 
structural degradation and lead to structural failure of the airplane 
with consequent loss of control.

DATES: We must receive comments on this proposed AD by December 26, 
2007.

ADDRESSES: Use one of the following addresses to comment on this 
proposed AD:
     Federal eRulemaking Portal: Go to http://
www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.

[[Page 60791]]

     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For service information identified in this proposed AD, contact 
Cessna Aircraft Company, Citation Marketing Division, P.O. 7706, 
Wichita, Kansas 67277; telephone: 1-800-835-4090; fax: 1-800-517-8500.

FOR FURTHER INFORMATION CONTACT: T.N. Baktha, Aerospace Engineer, 1801 
Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946-
4155; fax: (316) 946-4107.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments regarding this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include the docket number, ``FAA-
2007-28956; Directorate Identifier 2007-CE-068-AD'' at the beginning 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 http://
www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive concerning this proposed AD.

Discussion

    Cessna reported wing skin corrosion in a Model 525 and belly skin 
corrosion in several Model 525A airplanes. Cessna received information 
on more than 18 cases of significant corrosion. Cessna also received 
information on 42 cases of some corrosion on Models 525, 525A, and 525B 
airplanes. Corrosive fluids leaked after use of the cockpit mounted 
pilot relief tube and caused corrosion of the fuselage skins, fairings, 
fairing support structure, and wing structure.
    This condition, if not corrected, could result in structural 
degradation and lead to structural failure of the airplane with 
consequent loss of control.

Relevant Service Information

    We have reviewed the following Cessna service information for this 
AD:
     Service Bulletin SB525-53-20, dated April 30, 2007;
     Service Bulletin SB525A-53-01, dated April 30, 2007;
     Service Bulletin SB525B-53-01, dated April 30, 2007;
     Alert Service Letter ASL525-53-04, Revision 2, dated 
August 19, 2007;
     Alert Service Letter ASL525A-53-05, Revision 2, dated July 
25, 2007; and
     Alert Service Letter ASL525B-53-02, Revision 2, dated July 
25, 2007.
    The service information describes procedures for the following 
actions:
     Inspecting the lower wing skin structure, forward wing 
spars, lower fuselage skin, fairings, and external fairing frames for 
corrosion;
     Repairing corrosion by blending within specified limits or 
by contacting the manufacturer to obtain an FAA-approved repair scheme 
if corrosion damage can not be repaired within the limits specified;
     Doing a surface eddy current inspection or a dye-penetrant 
inspection on the repaired blended areas for cracks, and contacting the 
manufacturer to obtain an FAA-approved repair scheme if cracks are 
found;
     Applying a corrosion inhibitive sealant to the fuselage 
fairings before reinstalling; and
     Disabling the cockpit mounted relief tube.

FAA's Determination and Requirements of the Proposed AD

    We are proposing this AD because we evaluated all information and 
determined the unsafe condition described previously is likely to exist 
or develop on other products of the same type design. This proposed AD 
would require you to inspect the lower wing skin structure, forward 
wing spar, lower fuselage skin, fairings, and the external fairing 
frames for corrosion; repair any damage found; apply a corrosion 
inhibitive sealant to the fuselage fairings before reinstalling; and 
disable the cockpit mounted pilot relief tube.

Costs of Compliance

    We estimate that this proposed AD would affect 261 airplanes in the 
U.S. registry.
    We estimate the following costs to do the proposed inspection:

----------------------------------------------------------------------------------------------------------------
                                                                                  Total cost per   Total cost on
                  Labor cost                               Parts cost                airplane     U.S. operators
----------------------------------------------------------------------------------------------------------------
80 work-hours x $80 per hour = $6,400.........  Not Applicable..................          $6,400      $1,670,400
----------------------------------------------------------------------------------------------------------------

    We have no way of determining the number of airplanes that may need 
repair or further inspection based on the results of the proposed 
inspection, or the costs associated with such repair or inspection.
    We estimate the following costs to do the proposed disabling of the 
cockpit mounted pilot relief tube:

----------------------------------------------------------------------------------------------------------------
                                                                                  Total cost per   Total cost on
                  Labor cost                               Parts cost                airplane     U.S. operators
----------------------------------------------------------------------------------------------------------------
.5 work-hours x $80 per hour = $40............  Not Applicable..................             $40         $10,440
----------------------------------------------------------------------------------------------------------------

    Cessna will provide warranty credit to the extent specified in 
Cessna Citation Service Bulletin SB525-53-20, dated April 30, 2007; 
Service Bulletin SB525A-53-01, dated April 30, 2007; Service Bulletin 
SB525B-53-01, dated April 30, 2007; Alert Service Letter ASL525-53-04, 
Revision 2, dated August 19, 2007; Alert Service Letter ASL525A-53-05, 
Revision 2, dated July 25, 2007; and Alert Service Letter ASL525B-53-
02, Revision 2, dated July 25, 2007.

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

[[Page 60792]]

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 
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 regulatory evaluation of the estimated costs to 
comply with this proposed AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket that contains the proposed AD, the 
regulatory evaluation, any comments received, and other information on 
the Internet at http://www.regulations.gov; or in person at the Docket 
Management Facility between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays. The Docket Office (telephone (800) 647-5527) 
is located at the street address stated in the ADDRESSES section. 
Comments will be available in the AD docket shortly after receipt.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA 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 adding the following new AD:

Cessna Aircraft Company: Docket No. FAA-2007-28956; Directorate 
Identifier 2007-CE-068-AD.

Comments Due Date

    (a) We must receive comments on this airworthiness directive 
(AD) action by December 26, 2007.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to the following airplane models and serial 
numbers that have a cockpit mounted pilot relief tube installed and 
are certificated in any category:

------------------------------------------------------------------------
               Models                             Serial Nos.
------------------------------------------------------------------------
(1) 525.............................  0001 through 0637.
(2) 525A............................  0001 through 0347.
(3) 525B............................  0001 through 0152.
------------------------------------------------------------------------

Unsafe Condition

    (d) This AD results from leaking of the pilot relief tube, which 
caused corrosion of the airplane structure. We are issuing this AD 
to detect and correct any damage from corrosion on the airplane 
structure. Corrosion of the airplane structure could cause 
structural degradation and lead to structural failure of the 
airplane with consequent loss of control.

Compliance

    (e) To address this problem, you must do the following, unless 
already done:

------------------------------------------------------------------------
             Actions                  Compliance          Procedures
------------------------------------------------------------------------
(1) Inspect the lower wing skin   Within the next 90  Follow Cessna
 structure, forward wing spars,    days after the      Citation Alert
 lower fuselage skin, fairings,    effective date of   Service Letter
 and external fairing frames for   this AD.            ASL525-53-04,
 corrosion.                                            Revision 2, dated
                                                       August 19, 2007;
                                                       Alert Service
                                                       Letter ASL525A-53-
                                                       05, Revision 2,
                                                       dated July 25,
                                                       2007; or Alert
                                                       Service Letter
                                                       ASL525B-53-02,
                                                       Revision 2, dated
                                                       July 25, 2007.
(2) If corrosion damage is found  Before further      Follow Cessna
 in the lower wing skin            flight after the    Citation Alert
 structure, forward wing spars,    inspection          Service Letter
 lower fuselage skin, fairings,    required in         ASL525-53-04,
 and external fairing frames       paragraph (e)(1)    Revision 2, dated
 during the inspection required    of this AD.         August 19, 2007;
 in paragraph (e)(1) of this AD,                       Alert Service
 repair as specified in the                            Letter ASL525A-53-
 applicable service information.                       05, Revision 2,
 If the corrosion damage can not                       dated July 25,
 be repaired within the limits                         2007; or Alert
 specified in the applicable                           Service Letter
 service information, contact                          ASL525B-53-02,
 the manufacturer at 1-800-835-                        Revision 2, dated
 4090 for an FAA-approved repair                       July 25, 2007.
 scheme and incorporate this
 repair.
(3) If corrosion on the lower     Before further      Follow Cessna
 wing skin structure, forward      flight after the    Citation Alert
 wing spars, and lower fuselage    repair by           Service Letter
 skin was repaired by blending     blending was done   ASL525-53-04,
 within the limits specified in    as specified in     Revision 2, dated
 the service information, do a     paragraph (e)(2)    August 19, 2007;
 surface eddy current inspection   of this AD.         Alert Service
 or a dye-penetrant inspection                         Letter ASL525A-53-
 for cracks.                                           05, Revision 2,
                                                       dated July 25,
                                                       2007; or Alert
                                                       Service Letter
                                                       ASL525B-53-02,
                                                       Revision 2, dated
                                                       July 25, 2007.
(4) If cracks are found during    Before further      Contact Cessna
 the surface eddy current          flight after the    Aircraft Company,
 inspection or the dye-penetrant   inspection          Citation Customer
 inspection required in            required in         Support at 1-800-
 paragraph (e)(3) of this AD,      paragraph (e)(3)    835-4090.
 contact the manufacturer for an   of this AD.
 FAA-approved repair scheme and
 incorporate this repair.

[[Page 60793]]

 
(5) Install the fuselage          Before further      Follow Cessna
 fairings and apply corrosion      flight after the    Citation Alert
 inhibitive sealant.               inspection          Service Letter
                                   required in         ASL525-53-04,
                                   paragraph (e)(1)    Revision 2, dated
                                   of this AD if no    August 19, 2007;
                                   corrosion was       Alert Service
                                   found; or before    Letter ASL525A-53-
                                   further flight      05, Revision 2,
                                   after doing the     dated July 25,
                                   repairs and         2007; or Alert
                                   inspections         Service Letter
                                   required in         ASL525B-53-02,
                                   paragraphs          Revision 2, dated
                                   (e)(2), (e)(3),     July 25, 2007.
                                   and (e)(4) of
                                   this AD if
                                   corrosion or
                                   cracks were found.
(6) Determine the type of         Within the next 90  Cessna Citation
 installation of the cockpit       days after the      Service Bulletin
 mounted pilot relief tube and     effective date of   SB525-53-20,
 disable the relief tube.          this AD.            dated April 30,
                                                       2007; Service
                                                       Bulletin SB525A-
                                                       53-01, dated
                                                       April 30, 2007;
                                                       or Service
                                                       Bulletin SB525B-
                                                       53-01, dated
                                                       April 30, 2007.
------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (f) The Manager, Wichita Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. Send information to 
ATTN: T.N. Baktha, Wichita ACO, Aerospace Engineer, 1801 Airport 
Road, Room 100, Wichita, Kansas 67209; telephone: (316) 946-4155; 
fax: (316) 946-4107. Before using any approved AMOC on any airplane 
to which the AMOC applies, notify your appropriate principal 
inspector (PI) in the FAA Flight Standards District Office (FSDO), 
or lacking a PI, your local FSDO.

Related Information

    (g) To get copies of the service information referenced in this 
AD, contact Cessna Aircraft Company, Citation Marketing Division, 
P.O. 7706, Wichita, Kansas 67277; telephone: 1-800-835-4090; fax: 1-
800-517-8500. To view the AD docket, go to U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590, or 
on the Internet at http://www.regulations.gov. The docket number is 
Docket No. FAA-2007-28956; Directorate Identifier 2007-CE-068-AD.

    Issued in Kansas City, Missouri, on October 22, 2007.
James E. Jackson,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E7-21127 Filed 10-25-07; 8:45 am]
BILLING CODE 4910-13-P