2010-24-03: Tail rotor

2010-24-03 Robinson Helicopter Company: Amendment 39-16521; Docket No. FAA-2010-0711; Directorate Identifier 2008-SW-25-AD. Applicability: Model R22, R22 Alpha, R22 Beta, and R22 Mariner helicopters, serial numbers (S/N) 0002 through 3325, that have more than 2,200 hours total time-in-service (TIS); and Model R44, and R44 II helicopters, S/N 0001 through 1200, that have more than 2,200 hours total TIS, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent the tail rotor (T/R) control pedal bearing block support (support) from breaking, which can bind the T/R control pedals, resulting in a reduction of yaw control and subsequent loss of control of the helicopter, accomplish the following: (a) Within 100 hours TIS, visually inspect each A359-1 (left) and A359-2 (right) pedal support for a crack by referring to the figure in Robinson Helicopter Company (Robinson) Service Bulletin SB-97, dated February 22, 2008 (SB-97) for all Model R22 helicopters, and Robinson Service Bulletin SB-63, dated February 22, 2008 (SB-63) for all Model R44 helicopters. (1) If you find a crack in a support, before further flight, replace the cracked support with an airworthy support that is at least 0.050-inch thick. (2) For each uncracked support, measure the thickness of the support. If the support is less than 0.050-inch thick, before further flight, install a safety tab on the support in accordance with steps 4 and 5 of the Compliance Procedures section in SB-97 or SB-63, as appropriate for your model helicopter. (b) At the next 2,200 hours TIS overhaul, replace any support that is less than 0.050-inch thick, with an airworthy support that is at least 0.050-inch thick. (c) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Los Angeles Aircraft Certification Office, FAA, ATTN: Eric D. Schrieber, Aviation Safety Engineer, 3960 Paramount Blvd., Lakewood, California 90712, telephone (562) 627-5348, fax (562) 627-5210 (regarding Model R22 helicopters); or ATTN: Fred Guerin, Aviation Safety Engineer, telephone (562) 627- 5232, fax (562) 627-5210 (regarding Model R44 helicopters) for information about previously approved alternative methods of compliance. (d) The Joint Aircraft System/Component (JASC) Code is 6720: Tail Rotor Control System. (e) The inspection and modification shall be done in accordance with the specified portions of Robinson Helicopter Company Service Bulletin SB-97 or SB-63, both dated February 22, 2008. The Director of the Federal Register approved this incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Robinson Helicopter Company, 2901 Airport Drive, Torrance, California 90505, telephone (310) 539-0508, fax (310) 539- 5198. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 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. (f) This amendment becomes effective on December 29, 2010.