2006-13-06: Gas producer rotor assembly tie bolts

2006-13-06 Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison): Amendment 39-14659. Docket No. FAA-2005-22594; Directorate Identifier 2005-NE- 28-AD. Effective Date (a) This airworthiness directive (AD) becomes effective July 26, 2006. Affected ADs (b) None. Applicability (c) This AD applies to Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B17, -B17B, -B17C, -B17D, -B17E, -B17F, -B17F/1, -B17F/ 2, 250-C18, -C20, -C20B, -C20F, -C20J, -C20R, -C20R/1, -C20R/2, - C20R/4, -C20S, and "C20W series turboprop and turboshaft engines with the gas producer rotor assembly tie bolt part numbers (P/Ns) listed in the following Table 1, installed: Table 1.--Affected Gas Producer Rotor Assembly Tie Bolts Manufacturer Affected part numbers EXTEX Ltd. (EXTEX) A23008020 and E23008020 Rolls-Royce Corporation (RRC) 23008020, 6843388 and 6876991 Superior Air Parts Inc. (SAP) A23008020 Pacific Sky Supply Inc 23008020P These engines are installed on, but not limited to, aircraft in the following Table 2: Table 2.--Applicable Aircraft Helicopter Models Agusta A109, A109A, A109A II, A109C. Arrow Falcon Exporters OH 58A+ and OH 58C. Bell Textron 206A, 206B, 206L. Enstrom TH 28, 480, 480B. Eurocopter France AS355E, AS355F, AS355F1, AS355F2. Eurocopter Deutschland . BO 105A, BO 105C, BO 105S. FH 1100 Manufacturing Corp. FH 1100. Garlick OH 58A + OH 58C. McDonnell Douglas Company 369D, 369E, 369F, 369H, 369HM, 369HS, 369HE, 500N. San Joaquin OH 58A+ and OH 58C. Schweizer 269D. Aircraft Models B N Group Ltd. BN 2T and BN 2T 4R. SIAI Marchetti s.r.l. SF600, SF600A. Unsafe Condition (d) This AD results from eleven reports of RRC tie bolt failure due to high-cycle-fatigue. We are issuing this AD to prevent tie bolt failurethat could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine failure. 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. Remove Gas Producer Rotor Assembly Tie Bolts (f) Remove the P/N gas producer rotor assembly tie bolts listed in Table 1 of this AD from service the next time they are disassembled for any reason, or by October 31, 2011, whichever occurs first, and replace with tie bolts with P/Ns that are not listed in Table 1 of this AD. (g) After the effective date of this AD, do not install any gas producer rotor assembly tie bolt P/Ns listed in Table 1 of this AD in any RRC 250-B and 250-C Series turboprop and turboshaft engines. Alternative Methods of Compliance (h) The Manager, Los Angeles Aircraft Certification Office, has the authority to approve alternative methods of compliance for EXTEX, and Pacific Sky Supply Inc. gas producer rotor assembly tie bolts addressed in this AD, if requested, using the procedures found in 14 CFR 39.19. The Manager, Chicago Aircraft Certification Office, has the authority to approve alternative methods of compliance for RRC gas producer rotor assembly tie bolts addressed in this AD, if requested, using the procedures found in 14 CFR 39.19. The Manager, Southwest Special Certification Office, has the authority to approve alternative methods of compliance for SAP gas producer rotor assembly tie bolts addressed in this AD, if requested, using the procedures found in 14 CFR 39.19. Related Information (i) RRC Commercial Engine Bulletin (CEB) CEB A-304, CEB A-1371, CEB A-72-4076, TP CEB A-176, TP CEB A-1319, TP CEB A-72-2027, Revision N/C, dated May 23, 2005, and EXTEX Service Bulletin T-090, Revision N/C, dated May 23, 2005, pertain to the subject of this AD.