1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive 2022-01-09, Amendment 39-21897 (87 FR 1666, January 12, 2022); and b. Adding the following new airworthiness directive: 2023-02-03 Stemme AG: Amendment 39-22310; Docket No. FAA-2022-1421; Project Identifier MCAI-2022-01088-G. (a) Effective Date This airworthiness directive (AD) is effective March 1, 2023. (b) Affected ADs This AD replaces AD 2022-01-09, Amendment 39-21897 (87 FR 1666, January 12, 2022). (c) Applicability This AD applies to Stemme AG Model Stemme S 10-VT and Model Stemme S 12 gliders, all serial numbers, certificated in any category, with a freewheel clutch having part number 12AK with a serial number starting with "12-" installed, except those which have been modified by following the instructions of Stemme Service Bulletin Doc. No. P062-980058, Revision 02, dated April 19, 2022, and have been re-identified with "/M" at the end of the serial number. (d) Subject Joint Aircraft System Component (JASC) Code 7100, Powerplant System. (e) Unsafe Condition This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as unintended slipping of the freewheel clutch with overheating (burnishing) of the friction pads inside of the clutch. The FAA is issuing this AD to ensure removal of the affected freewheel clutch from service. The unsafe condition, if not addressed, could result in a loss of thrust and consequent loss of glider control. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Action and Compliance (1) Before further flight after the effective date of this AD, remove the freewheel clutch from service. (2) As of the effective date of this AD, do not install a freewheel clutch part number 12AK with a serial number starting with "12-" on any glider, unless it has been modified by following the instructions of Stemme Service Bulletin Doc. No. P062-980058, Revision 02, dated April 19, 2022, and has been re-identified with "/M" at the end of the serial number. (h) Alternative Methods of Compliance (AMOCs) The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in § 39.19. In accordance with § 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, mail it to the address identified in paragraph (i)(2) of this AD or email to:
[email protected]. If mailing information, also submit information by email. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. AMOCs approved for AD 2022-01-09 are approved as AMOCs for the corresponding provisions of this AD. (i) Additional Information (1) Refer to European Union Aviation Safety Agency (EASA) AD 2021-0278R1, dated August 11, 2022, for related information. This EASA AD may be found in the AD docket at regulations.gov under Docket No. FAA-2022-1421. (2) For more information about this AD, contact Jim Rutherford, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 901 Locust, Room 301, Kansas City, MO 64106; phone: (816) 329-4165; email:
[email protected]. (3) For service information identified in this AD that is not incorporated by reference, contact Stemme AG, Flugplatzstrasse F2, Nr. 6-7, D-15344 Strausberg, Germany; phone: +49 (0) 3341 3612-0; fax: +49 (0) 3341 3612-30; email:
[email protected]; website: stemme.com. You may view this referenced service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call (817) 222-5110. (j) Material Incorporated by Reference None. Issued on January 19, 2023. Christina Underwood, Acting Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2023-01285 Filed 1-24-23; 8:45 am]BILLING CODE 4910-13-P
