2012-11-05: Main Rotor Control

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 removing Amendment 39-16900 (77 FR 729, January 6, 2012), and adding the following new airworthiness directive (AD): 2012-11-05 Enstrom Helicopter Corporation: Amendment 39-17068; Docket No. FAA-2012-0562; Directorate Identifier 2012-SW-038-AD. (a) Applicability This AD applies to the Enstrom Model F-28C, F-28C-2, F-28F, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters with a trim relay, part-number (P/N) KUP14D55-24, KUP14D55-472, M83536/10-015M, or M83536/10-024M, certificated in any category. Note to paragraph (a) of this AD: This AD does not apply to the specified helicopters with a reversible trim motor, P/N 28-16621 (Ford Motor Company C1AZ-14553A) or P/N AD1R-10 (Signal Electric). (b) Unsafe Condition This AD defines the unsafe condition as a failure of a trim relay in the cyclic trim system. This condition could result in reduced controllability of the helicopter and subsequent loss of control of the helicopter. (c) Other Affected ADs This AD supersedes AD 2011-26-10, Amendment 39-16900 (77 FR 729, January 6, 2012). (d) Effective Date This AD becomes effective July 3, 2012. (e) 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. (f) Required Actions Within 5 hours time-in-service (TIS) or at the next annual or 100 hour TIS inspection, whichever occurs first: (1) For the Enstrom Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX helicopters, modify the lateral and longitudinal trim actuatorassemblies using the cyclic trim assembly kit (modification kit), P/ N 28-01063-1, in accordance with the instructions in paragraph 6.1 of the Enstrom Service Directive Bulletin (SDB) No. 0110, Revision 4, dated January 23, 2012 (SDB No. 0110 R4), except when the instructions specify using ``Aeroshell 22 grease'' or ``VC-3 Vibra- tite thread locker,'' you may use an equivalent product. (2) For the Enstrom Model TH-28, 480, and 480B helicopters, modify the lateral and longitudinal trim actuator assemblies using the modification kit, P/N 4230045-1, in accordance with the instructions in paragraph 6.1 of the Enstrom SDB No. T-039, Revision 3, dated July 6, 2011 (SDB No. T-039 R3), except when the instructions specify using ``Aeroshell 22 grease'' or ``VC-3 Vibra- tite thread locker,'' you may use an equivalent product, and you are not required to contact Enstrom Customer Service. (3) After modifying the lateral and longitudinal trim actuator assemblies in accordance with paragraphs(f)(1) or (f)(2) of this AD, before further flight, operationally test the trim limits in accordance with paragraph 6.2. of the SDB for your model helicopter, and determine during a flight test whether there is appropriate trim authority in accordance with paragraph 6.3. of the SDB for your model helicopter. (g) Special Flight Permits A one-time special-flight permit may be issued in accordance with 14 CFR 21.197 and 21.199 provided the helicopter is operated with the trim system circuit breaker pulled. [[Page 36134]] (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, Chicago Aircraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: Gregory J. Michalik, Enstrom Program Manager, FAA, Chicago Aircraft Certification Office, 2300 East Devon Avenue, Room 107, Des Plaines, Illinois, 60018; telephone (847) 294-7135; fax (847) 294-7834; email: gregory.michalik@faa.gov. (2) For operations conducted under a 14 CFR part 119operating 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. (i) Subject Joint Aircraft Service Component (JASC) Code: 6710: Main Rotor Control. (j) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the following service information under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use the following service information to do the actions required by this AD, unless the AD specifies otherwise. (3) The following service information was approved for IBR on July 3, 2012. (i) Enstrom Service Directive Bulletin No. 0110, Revision 4, dated January 23, 2012, for Model F-28C, F-28C-2, F-28F, 280C, 280F, and 280FX helicopters. (4) The following service information was approved for IBR on January 23, 2012 (77 FR 729, January 6, 2012). (i) Enstrom Service Directive Bulletin No. T-039, Revision 3, dated July 6, 2011, for Model TH-28, 480, and 480B helicopters. (5) For service information identified in this AD, contact Enstrom Helicopter Corporation, 2209 22nd St., Menominee, Michigan, 49858-0490; telephone: 906-863-1200; email: customerservice@enstromhelicopter.com; Web site: http://www.enstromhelicopter.com/enstrom_new/enstrom_support_tec.html. (6) You may review a copy of the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137 or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.