AD 2006-16-04 Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C Series Turboshaft and Turboprop Engines

This AD applies to Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) 250-B and 250-C series turboshaft and turboprop engines in the following Table 1: Table 1.—250-B and 250-C Series Turboshaft and Turboprop Engines Affected   -B15A -B15E -B15G -B17 -B17B -B17C -B17D -B17E -B17F -B17F/1 -B17F/2 -C10 -C10B -C10D -C18 -C18A -C18B -C18C -C20 -C20B -C20C -C20F -C20J -C20R -C20R/1 -C20R/2 -C20R/4 -C20S -C20W -C28 -C28B -C28C -C30 -C30G -C30G/2 -C30M -C30P -C30R -C30R/1 -C30R/3 -C30R/3M -C30S -C30U -C40B -C47B -C47M These engines are installed on, but not limited to, the aircraft listed in the following Table 2: Table 2.—Engines Installed on, But Not Limited To Manufacturer Model AeroSpace Technologies of Australia Pty Ltd N22B, N22S, and N24A. Agusta A109, A109A, A109AII, and A109C. Arrow Falcon Exporters OH-58A, OH-58A+, and OH-58C. Bell Helicopter Textron 206A, 206A-1, 206B, 206L, 206L-1, 206L-3, 206L-4, 230, 407, and 430. B-N Group BN-2T and BN-2T-4R. Enstrom Helicopter TH28, 480; and 480B. Eurocopter Canada Limited BO 105 LS A-3. Eurocopter Deutschland BO-105A, BO-105C, BO-105LS A-1, and BO-105S. Eurocopter France AS355E, AS355F, AS355I, and AS355F2. FH-1100 Manufacturing Corporation 100, 420, and MX-7-420A. Garlick Helicopters OH-58A, OH-58A+, OH-58C; Maule zm-7-420A, MT-7-420, MX-7-420, MX-7-420A. MD Helicopters Inc 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N. San Joaquin Helicopters OH-58A, OH-58A+, and OH-58C. Schweizer TH269D. SIAI Marchetti s.r.l SF600 and SF600A. Sikorsky Aircraft Corporation S-76A. Vulcanair S.p.A AP68TP 300, and AP68TP 600.

You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) Perform a onetime inspection of the screens in fuel nozzles as follows: (1) For fuel nozzles with a P/N listed in Table 3 of this AD, inspect the screen for contamination within 50 operating hours after the effective date of this AD. Table 3.—Fuel Nozzles To Be Inspected Within 50 Operating Hours Manufacturer P/N Corresponding RRC vendor P/N RRC 6874959 6894610 6898531 5232815 5233465 5233585 Goodrich Delavan (Parts Manufacturer Approval (PMA)) 47069 47101 49445 N/A N/A N/A (2) For fuel nozzles with a P/N listed in Table 4 of this AD, inspect the screen for contamination within 150 operating hours after January 5, 2005. Table 4.—Fuel Nozzles To Be Inspected Within 150 Operating Hours Manufacturer P/N Corresponding RRC vendor P/N RRC 6852020 6890917 6899001 5232480 5233333 5233600 (g) If you find contamination on the screen, inspect and clean the entire aircraft fuel system before further flight. (h) At the next fuel nozzle overhaul after the effective date of this AD, do the following: (1) Remove from service fuel nozzles listed in Table 3 and Table 4 of this AD. (2) Replace with a serviceable fuel nozzle. Definition (i) For the purposes of this AD, a serviceable fuel nozzle is defined as a nozzle that has a P/N not specified in, or addressed by, this AD. Previous Credit (j) Previous credit is given for onetime inspections of fuel nozzles, RRC P/Ns 6852020, 6890917, and 6899001 using AD 2004-24-09. Alternative Methods of

This AD is prompted by the discovery that several part numbers (P/Ns) of fuel nozzles were inadvertently left out of AD 2004-24-09. That AD, as worded, allows certain P/N fuel nozzles back into service. Those fuel nozzles must not be allowed back into service. We are issuing this AD to minimize the risk of sudden loss of engine power and uncommanded shutdown of the engine due to fuel contamination and collapse of the screen in the fuel nozzle.