2012-23-05: DC Generator Control Unit

Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39--AIRWORTHINESS DIRECTIVES 0 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. Sec. 39.13 [Amended] 0 2. The FAA amends Sec. 39.13 by adding the following new airworthiness directive (AD): 2012-23-05 Eurocopter Deutschland GMBH: Amendment 39-17261; Docket No. FAA-2012-0528; Directorate Identifier 2011-SW-068-AD. (a) Applicability This AD applies to Model MBB-BK117 C-2 helicopters with a generator control unit (GCU), part number (P/N) 51530-021EI with no modification (MOD), MOD A, or MOD B installed, certificated in any category. (b) Unsafe Condition This AD defines the unsafe condition as an internal short circuit in certain GCUs. This condition could result in loss of electrical generating power, resulting in the lossof systems required for continued safe flight and landing, and subsequent loss of control of the helicopter. (c) Effective Date This AD becomes effective December 26, 2012. (d) Compliance You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time. (e) Required Actions (1) Within the next 300 hours time-in-service or 6 months, whichever occurs first, replace all GCUs with no MOD, MOD A, or MOD B with an airworthy GCU. [[Page 69558]] (2) Do not install a GCU P/N 51530-021-EI with no MOD, MOD A, or MOD B on any helicopter. (f) Alternative Methods of Compliance (AMOCs) (1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: George Schwab, Aviation Safety Engineer, FAA, Rotorcraft Directorate, Safety Management Group, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5114; email [email protected]. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC. (g) Additional Information (1) Eurocopter Deutschland GmbH Alert Service Bulletin MBB-BK117 C-2-24A-010 Revision 2, dated September 14, 2011, which is not incorporated by reference, contains additional information about the subject of this AD. (2) For service information identified in this AD, contact American Eurocopter Corporation, 2701 N. Forum Drive, Grand Prairie, TX 75052, telephone (972) 641-0000 or (800) 232-0323, fax (972) 641- 3775, or at http://www.eurocopter.com/techpub. You may review a copy of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. (3) The subject of this AD is addressed in European Aviation Safety Agency AD No. 2011-0149R1, dated September 30, 2011. (h) Subject Joint Aircraft Service Component (JASC) Code: 2436: DC Generator Control Unit.