2002-15-05: Digital Electronic Control Units (DECU's) and Electronic Control Units (ECU's)

2002-15-05 Turbomeca: Amendment 39-12833. Docket No. 2001-NE-23-AD. Applicability This airworthiness directive (AD) is applicable to Turbomeca Makila 1 A, 1 A1, and 1 A2 turboshaft engines with digital electronic control units (DECU's) and electronic control units (ECU's) that have a part number (P/N) listed in the following Table 1: Table 1.-ECU and DECU P/N's ECU or DECU P/N Used on 0 177 69 810 0, 0 177 69 811 0, 0 177 69 812 0, 0 177 69 813 0, 0 177 69 814 0, 0 177 69 815 0, 0 177 69 816 0, 0 177 69 817 0, 0 177 69 818 0, 0 177 69 819 0, 0 177 69 820 0, 0 177 69 824 0, 0 177 69 825 0, 0 177 69 826 0, 0 177 69 827 0, 0 177 69 828 0, and 0 177 69 829 0. Makila 1 A and 1 A1 engines. 70CMB01040 Makila 1 A2 engines. These engines are installed on, but not limited to Eurocopter France model AS 332C, AS 332L, AS 332L1 and AS 332L2, helicopters. Note 1: This AD applies to each engine identified in the preceding applicability provision, regardless ofwhether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance Compliance with this AD is required within 45 days after the effective date of this AD, unless already done. To prevent an engine overspeed condition resulting from the failure of two or more NTL channels, do the following: (a) For Makila 1 A and 1 A1 engines do either of the following: (1) Replace ECU's that have a P/N listed in Table 1 ofthis AD, with ECU's that have been modified to modification standard TU 215, or (2) Replace the comparator / selector circuit board in accordance with Turbomeca service bulletin (SB) 298 73 0166, dated October 5, 2001. (b) For Makila 1 A2 engines, replace DECU, P/N 70CMB01040, with modified DECU, P/N 70CMB01050. Information on the modified DECU may be found in Turbomeca service bulletin (SB) 298 73 0149, dated January 13, 2000. Alternative Methods of Compliance (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office (ECO). Operators must submit their request through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, ECO. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from theECO. Special Flight Permits (d) Special flight permits may be issued in accordance with 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the helicopter to a location where the requirements of this AD can be done. Documents That Have Been Incorporated By Reference (e) The inspection must be done in accordance with Turbomeca Service Bulletin No. 298 73 0166, dated October 5, 2001. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Turbomeca, 40220 Tarnos, France. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC. Note 3: The subject of this AD is addressed in DGAC airworthiness directives 2000-068(A), dated February 9, 2000,and 2001-546(A), dated November 14, 2001. Effective Date (f) This amendment becomes effective on August 16, 2002.