2008-03-10: Lower wing skin structure

2008-03-10 Cessna Aircraft Company: Amendment 39-15360; Docket No. FAA-2007-28956; Directorate Identifier 2007-CE-068-AD. Effective Date (a) This AD becomes effective on March 11, 2008. 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 Numbers (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, unlessalready done: Table 1.--Actions, Compliance, and Procedures Actions Compliance Procedures (1) Inspect the lower wing skin structure, forward wing spars, lower fuselage skin, fairings, and external fairing frames for corrosion. Within the next 90 days after March 11, 2008 (the effective date of this AD). Follow Cessna Citation Alert Service Letter ASL525-53-04, Revision 2, dated August 19, 2007; Cessna Citation Alert Service Letter ASL525A-53-05, Revision 2, dated July 25, 2007; or Cessna Citation Alert Service Letter ASL525B-53-02, Revision 2, dated July 25, 2007. (2) If corrosion damage is found in the lower wing skin structure, forward wing spars, lower fuselage skin, fairings, or 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. 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; Cessna Citation Alert Service Letter ASL525A-53-05, Revision 2, dated July 25, 2007; or Cessna Citation Alert Service Letter ASL525B-53-02, Revision 2, dated July 25, 2007. (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 dye-penetrant inspection for cracks. Before further flight after the repair by blending was done as specified in paragraph (e)(2) of this AD. Follow Cessna Citation Alert Service Letter ASL525-53-04, Revision 2, dated August 19, 2007; Cessna Citation Alert Service Letter ASL525A-53-05, Revision 2, dated July 25, 2007; or Cessna Citation Alert Service Letter ASL525B-53-02, Revision 2, dated July 25, 2007. (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)(3) of this AD. Contact Cessna Aircraft Company, Citation Customer Support at 1-800-835-4090. (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. Follow Cessna Citation Alert Service Letter ASL525-53-04, Revision 2, dated August 19, 2007; Cessna Citation Alert Service Letter ASL525A-53-05, Revision 2, dated July 25, 2007; or Cessna Citation AlertService Letter ASL525B-53-02, Revision 2, dated July 25, 2007. (6) Determine the type of installation of the cockpit mounted pilot relief tube and disable the relief tube. Before further flight after the inspection required in paragraph (e)(1) of this AD. Cessna Citation Service Bulletin SB525-53-20, dated April 30, 2007; Cessna Citation Service Bulletin SB525A-53-01, dated April 30, 2007; or Cessna Citation 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. Material Incorporated by Reference (g) You must use the service information specified in Table 2 of this AD to do the actions required by this AD, unless the AD specifies otherwise. (1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) For service information identified 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. (3) You may review copies at the FAA, Central Region, Office of the Regional Counsel, 901 Locust, Kansas City, Missouri 64106; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202- 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html . Table 2.--Material Incorporated by Reference Service Bulletin No. Revision Date Cessna Citation Alert Service Letter ASL525-53-04 2 August 19, 2007 Cessna Citation Alert Service Letter ASL525A-53-05 2 July 25, 2007 Cessna Citation Alert Service Letter ASL525B-53-02 2 July 25, 2007 Cessna Citation Service Bulletin SB525-53-20 April 30, 2007 Cessna Citation Service Bulletin SB525A-53-01 April 30, 2007 Cessna Citation Service Bulletin SB525B-53-01 April 30, 2007