AD 2006-07-23 Airworthiness Directives; Boeing Model 757 Airplanes

Models named: 757-200, -200PF, -200CB, -300 series. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to all Boeing Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Service Bulletin References (f) The term “service bulletin,” as used in this AD, means the Accomplishment Instructions and Appendix A of the following service bulletins, as applicable: (1) For Model 757-200, -200PF, -200CB series airplanes: Boeing Special Attention Service Bulletin 757-27-0148, dated June 16, 2005; and (2) For Model 757-300 series airplanes: Boeing Special Attention Service Bulletin 757-27-0149, dated June 16, 2005. Repetitive Measurements (g) Within 18 months after the effective date of this AD: Measure the freeplay for each of the three power control units that move the rudder. Repeat the measurement thereafter at intervals not to exceed 12,000 flight hours or 36 months, whichever occurs first. Do all actions required by this paragraph in accordance with the applicable service bulletin. Related Investigative and Corrective Actions (h) If any measurement found in paragraph (g) of this AD is outside certain limits specified in the service bulletin: Before further flight, do the applicable related investigative and corrective actions in accordance with the service bulletin. Repetitive Lubrication (i) Within 9 months after the effective date of this AD: Lubricate the rudder components specified in the applicable service bulletin. Repeat the lubrication thereafter at the applicable interval in paragraph (i)(1) or (i)(2) of this AD. Do all actions required by this paragraph in accordance with the applicable service bulletin. (1) For airplanes on which BMS 3-33 grease is not used: 3,000 flight hours or 9 months, whichever occurs first. (2) For airplanes on which BMS 3-33 grease is used: 6,000 flight hours or 18 months, whichever occurs first. Concurrent Repetitive Cycles (j) If a freeplay measurement required by paragraph (g) of this AD and a lubrication cycle required by paragraph (i) of this AD are due at the same time or will be accomplished during the same maintenance visit, the freeplay measurement and applicable related investigative and corrective actions must be done before the lubrication is accomplished. Alternative Methods of Compliance (AMOCs) (k)(1) The Manager, Seattle Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD, if it is approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. Material Incorporated by Reference (l) You must use Boeing Special Attention Service Bulletin 757-27-0148, dated June 16, 2005; or Boeing Special Attention Service Bulletin 757-27-0149, dated June 16, 2005; as applicable; to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207, for a copy of this service information. You may review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov; or at the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Issued in Renton, Washington, on March 30, 2006. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 06-3378 Filed 4-10-06; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report of freeplay-induced vibration of the rudder. The potential for vibration of the control surface should be avoided because the point of transition from vibration to divergent flutter is unknown. We are issuing this AD to prevent excessive vibration of the airframe during flight, which could result in divergent flutter and loss of control of the airplane.