AD 2005-20-09 Airworthiness Directives; BAE Systems (Operations) Limited Model ATP Airplanes

Models named: ATP. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to BAE Systems (Operations) Limited Model ATP airplanes, certificated in any category; on which modification 35256A (BAE Systems (Operations) Limited Service Bulletin ATP-54-10) has been accomplished.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Inspection and Replacement (f) At the later of the times specified in paragraphs (f)(1) and (f)(2) of this AD: Do a detailed inspection for missing or failed bolts that attach aft isolator brackets to both engine subframes in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-54-20, dated July 29, 2003. Repeat the inspection thereafter at intervals not to exceed 2,000 flight cycles. (1) Within 2,000 flight cycles after the last torque check of the bolts attaching the aft isolator brackets to both engine subframes done in accordance with BAE Systems (Operations) Limited Service Bulletin ATP-54-20. (2) Within 300 flight cycles after the effective date of this AD. Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.” (g) If any bolt is missing or failed on any engine subframe during the inspection required by paragraph (f) of this AD: Before further flight, replace all bolts on that engine subframe in accordance with the Accomplishment Instructions of BAE Systems (Operations) Limited Service Bulletin ATP-54-20, dated July 29, 2003. If any bolt holes on any engine subframe are not within the tolerance specified in the service bulletin: Before further flight, repair according to a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the Civil Aviation Authority (CAA) (or its delegated agent). Parts Installation (h) As of the effective date of this AD, no person may install a quick engine change unit subframe on any airplane, unless the subframe has been inspected in accordance with paragraph (f) of this AD. No Reporting Requirement (i) Although the service bulletin referenced in this AD specifies to submit certain information to the manufacturer, this AD does not include that requirement. Alternative Methods of Compliance (AMOCs) (j)(1) The Manager, International Branch, ANM-116, Transport Airplane Directorate, 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 14 CFR 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Related Information (k) British airworthiness directive G-2004-0001, dated January 22, 2004, also addresses the subject of this AD. Material Incorporated by Reference (l) You must use BAE Systems (Operations) Limited Service Bulletin ATP-54-20, dated July 29, 2003, 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 this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact British Aerospace Regional Aircraft American Support, 13850 Mclearen Road, Herndon, Virginia 20171, 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 September 20, 2005. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-19437 Filed 10-3-05; 8:45 am] BILLING CODE 4910-13-U

This AD results from reports of failures of the bolts attaching the aft isolators to the engine subframe. We are issuing this AD to prevent failure of the bolts attaching the aft isolators to the engine subframe, which may result in an engine separating from the airplane.