2005-17-17R1: O-rings on the check valve piston

2005-17-17R1 Turbomeca S.A.: Amendment 39-14940; Docket No. FAA- 2005-22039; Directorate Identifier 2005-NE-33-AD. Effective Date (a) This airworthiness directive (AD) becomes effective March 21, 2007. Affected ADs (b) This AD revises AD 2005-17-17, Amendment 39-14238. Applicability (c) This AD applies to Turbomeca S.A. Arrius 2F turboshaft engines that have not incorporated modification Tf75. These engines are installed on, but not limited to, Eurocopter EC120B helicopters. Unsafe Condition (d) This AD results from Turbomeca S.A. introducing a check valve piston design requiring no O-ring. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, which could result in a forced autorotation landing and damage to the helicopter. Compliance (e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. O-ring Replacement (f) Replace the O-ring on the check valve piston in the lubrication unit at the intervals specified in Table 1 of this AD. Use the "Instructions to be Incorporated,'' 2.A. through 2.C. (2) of Turbomeca Alert Service Bulletin No. A319 79 4802, Update No. 1, dated April 3, 2006, to replace the O-ring. Table 1.--Compliance Times for O-ring Replacement If the class of oil is: Then replace the O-ring by the later of: Thereafter, replace the O-ring within: (1) HTS or unknown. 300 hours time-since-new (TSN) or 50 hours after the effective date of this AD. 300 hours time-since-last replacement (TSR). (2) STD. 450 hours TSN or 50 hours after the effective date of this AD. 500 hours TSR. Alternative Methods of Compliance (g) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. Related Information (h) Contact Christopher Spinney, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238- 7175, fax (781) 238-7199; e-mail: [email protected] for more information about this AD. European Aviation Safety Agency AD No. 2006-0141, dated May 29, 2006, also addresses the subject of this AD. Material Incorporated by Reference (i) You must use Turbomeca Alert Service Bulletin No. A319 79 4802, Update No. 1, dated April 3, 2006, to perform the replacements required by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Turbomeca S.A., 40220 Tarnos, France; telephone 33 05 59 74 40 00, fax 33 05 59 74 45 15, for a copy of this service information. You may review copies 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/cfr/ibr-locations.html .