39254 Federal Register / Vol. 76, No. 129 / Wednesday, July 6, 2011 / Rules and Regulations Unsafe Condition Airframe Branch, ANM–120L, FAA, Los previously sent to all known U.S. (e) This AD was prompted by a report of Angeles Aircraft Certification Office (ACO), owners and operators. That EAD a crack found in the upper center skin panel 3960 Paramount Blvd., Lakewood, California currently requires removing each at the aft inboard corner of a right horizontal 90712–4137; phone: 562–627–5233; fax: 562– locknut and verifying sufficient drag 627–5210; e-mail: [email protected]. stabilizer. We are issuing this AD to detect torque and retorquing, or if the locknut and correct cracks in the horizontal stabilizer Material Incorporated by Reference does not have sufficient drag torque, upper center skin panel. Uncorrected cracks might ultimately lead to the loss of overall (j) You must use Boeing Alert Service replacing the locknut with an airworthy structural integrity of the horizontal Bulletin MD80–55A068, dated July 16, 2010, locknut. This AD retains the existing stabilizer. to do the actions required by this AD, unless EAD requirements but also requires the AD specifies otherwise. within a specified time, modifying the Compliance (1) The Director of the Federal Register expandable bolts and installing a cotter (f) Comply with this AD within the approved the incorporation by reference of pin. This AD is prompted by a locknut this service information under 5 U.S.C. compliance times specified, unless already working loose from a bolt attaching the done. 552(a) and 1 CFR part 51. (2) For service information identified in tailboom support strut at the aft cluster Inspections this AD, contact Boeing Commercial fitting because the locknut installed on (g) Before the accumulation of 20,000 total Airplanes, Attention: Data & Services the expandable bolt did not have the flight cycles, or within 4,379 flight cycles Management, 3855 Lakewood Boulevard, MC proper threads. We are issuing this AD after the effective date of this AD, whichever D800–0019, Long Beach, California 90846– to modify each expandable bolt to allow occurs later, do eddy current inspections to 0001; phone: 206–544–5000, extension 2; fax: adding a cotter pin to prevent the strut detect cracking of the left and right upper 206–766–5683; e-mail: center skin panels of the horizontal stabilizer, and driveshaft separating from the [email protected]; Internet: https:// helicopter and subsequent loss of in accordance with the Accomplishment www.myboeingfleet.com. Instructions of Boeing Alert Service Bulletin (3) You may review copies of the service control of the helicopter. MD80–55A068, dated July 16, 2010. information at the FAA, Transport Airplane DATES: This AD is effective July 21, (1) If no crack is found during any Directorate, 1601 Lind Avenue, SW., Renton, 2011. inspection required by paragraph (g) of this Washington. For information on the The Director of the Federal Register AD, repeat the applicable inspections availability of this material at the FAA, call approved the incorporation by reference thereafter at the applicable times specified in 425–227–1221. paragraph 1.E., ‘‘Compliance,’’ of Boeing of certain publications listed in the AD (4) You may also review copies of the as of July 21, 2011. Alert Service Bulletin MD80–55A068, dated service information that is incorporated by July 16, 2010. reference at the National Archives and We must receive any comments on (2) If any crack is found during any Records Administration (NARA). For this AD by September 6, 2011. inspection required by paragraph (g) of this information on the availability of this ADDRESSES: You may send comments by AD, before further flight, replace the skin material at an NARA facility, call 202–741– panel with a new skin panel, in accordance any of the following methods: 6030, or go to http://www.archives.gov/ • with the Accomplishment Instructions of Federal eRulemaking Portal: Go to federal_register/code_of_federal_regulations/ Boeing Alert Service Bulletin MD80–55A068, http://www.regulations.gov. Follow the ibr_locations.html. dated July 16, 2010. Within 20,000 flight instructions for submitting comments. cycles after the replacement, do eddy current Issued in Renton, Washington, on June 16, • Fax: 202–493–2251. inspections as required by paragraph (g) of 2011. • Mail: U.S. Department of this AD. Ali Bahrami, Transportation, Docket Operations, Alternative Methods of Compliance Manager, Transport Airplane Directorate, M–30, West Building Ground Floor, (AMOCs) Aircraft Certification Service. Room W12–140, 1200 New Jersey (h)(1) The Manager, Los Angeles Aircraft [FR Doc. 2011–15990 Filed 7–5–11; 8:45 am] Avenue, SE., Washington, DC 20590. • Certification Office (ACO), FAA, has the BILLING CODE 4910–13–P Hand Delivery: U.S. Department of authority to approve AMOCs for this AD, if Transportation, Docket Operations, requested using the procedures found in 14 M–30, West Building Ground Floor, CFR 39.19. In accordance with 14 CFR 39.19, DEPARTMENT OF TRANSPORTATION Room W12–140, 1200 New Jersey send your request to your principal inspector Avenue, SE., Washington, DC 20590, or local Flight Standards District Office, as Federal Aviation Administration between 9 a.m. and 5 p.m., Monday appropriate. If sending information directly through Friday, except Federal holidays. to the manager of the ACO, send it to the 14 CFR Part 39 attention of the person identified in the For service information identified in Related Information section of this AD. [Docket No. FAA–2011–0593; Directorate this AD, contact Schweizer Aircraft (2) Before using any approved AMOC, Identifier 2011–SW–002–AD; Amendment Corporation, Elmira/Corning Regional notify your appropriate principal inspector, 39–16723; AD 2011–12–16] Airport, 1250 Schweizer Road, or lacking a principal inspector, the manager Horseheads, NY 14845, telephone (607) of the local flight standards district office/ RIN 2120–AA64 739–3821, fax: (607) 796–2488, e-mail certificate holding district office. address [email protected], or at (3) An AMOC that provides an acceptable Airworthiness Directives; Schweizer level of safety may be used for any repair Aircraft Corporation (Schweizer) Model http://www.sacusa.com/support. required by this AD if it is approved by the 269A, A–1, B, C, C–1, and TH–55 Series Examining the AD Docket Boeing Commercial Airplanes Organization Helicopters Designation Authorization (ODA) that has You may examine the AD docket on been authorized by the Manager, Los Angeles AGENCY: Federal Aviation the Internet at http:// ACO, to make those findings. For a repair Administration (FAA), DOT. www.regulations.gov; or in person at the method to be approved, the repair must meet ACTION: Final rule; request for Docket Management Facility between the certification basis of the airplane and 14 comments. 9 a.m. and 5 p.m., Monday through CFR 25.571, Amendment 45, and the Friday, except Federal holidays. The AD approval must specifically refer to this AD. SUMMARY: We are superseding an docket contains this AD, the regulatory Related Information existing emergency airworthiness evaluation, any comments received, and (i) For more information about this AD, directive (EAD) for the specified other information. The street address for contact Roger Durbin, Aerospace Engineer, Schweizer model helicopters that was the Docket Office (telephone: 800–647– VerDate Mar<15>2010 17:43 Jul 05, 2011 Jkt 223001 PO 00000 Frm 00010 Fmt 4700 Sfmt 4700 E:\FR\FM\06JYR1.SGM 06JYR1 mstockstill on DSK4VPTVN1PROD with RULES Federal Register / Vol. 76, No. 129 / Wednesday, July 6, 2011 / Rules and Regulations 39255 5527) is in the ADDRESSES section. 1, B, and C helicopters, and No. C1B– corrected, could result in the strut and Comments will be available in the AD 032 for Model 269C–1 helicopters, both driveshaft separating from the docket shortly after receipt. dated December 21, 2010. The service helicopter and subsequent loss of FOR FURTHER INFORMATION CONTACT: information specifies verifying control of the helicopter. Therefore, we Stephen Kowalski, Aviation Safety sufficient drag torque on each locknut find that notice and opportunity for Engineer, FAA, Airframe and and applying the proper torque to each prior public comment are impracticable Propulsion Branch, ANE–171, 1600 locknut. The service information also because of the short compliance time Stewart Ave., Suite 410, Westbury, New specifies modifying both expandable and that good cause exists for making York 11590, telephone (516) 228–7327, bolts to allow the addition of a cotter this amendment effective in less than 30 fax (516) 794–5531. pin. days. SUPPLEMENTARY INFORMATION: FAA’s Determination Comments Invited Discussion We are issuing this AD because we This AD is a final rule that involves On December 20, 2010, we issued evaluated all the relevant information requirements affecting flight safety, and EAD 2011–01–52, Directorate Identifier and determined the unsafe condition we did not provide notice and an 2010–SW–111–AD, for the specified described previously is likely to exist or opportunity to comment before it Schweizer model helicopters. That EAD develop on other helicopters of these becomes effective. However, we invite requires, before further flight, removing same type designs. you to send any written data, views, or the locknut and reinstalling the locknut AD Requirements while determining the locknut drag arguments about this AD. Send your torque. If the drag torque is a minimum This AD retains the requirements in comments to an address listed under the of 2 in-lbs, retorquing the locknut to 23 the existing EAD. This AD also requires, ADDRESSES section. Include the Docket in-lbs is required. If the drag torque is within 10 hours time-in-service (TIS), Number FAA–2011–0593 and not at least 2 in-lbs, replacing the modifying both expandable bolts by Directorate Identifier 2011–SW–002–AD locknut with an airworthy locknut is drilling a hole through each bolt to at the beginning of your comments.