Airworthiness directives › 2006-13-06
AD 2006-13-06 Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Applicability*9
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.
Compliance
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
Unsafe condition
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 failure that could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine failure.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1