2021-23-01: Airspeed/Mach Indicator

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 adding the following new airworthiness directive: 2021-23-01 Stemme AG: Amendment 39-21799; Docket No. FAA-2021-0716; Project Identifier 2019-CE-023-AD. (a) Effective Date This airworthiness directive (AD) is effective January 27, 2022. (b) Affected ADs None. (c) Applicability This AD applies to Stemme AG Model Stemme S 12 gliders, all serial numbers, certificated in any category. (d) Subject Joint Aircraft System Component (JASC) Code 3414, Airspeed/Mach Indicator. (e) Unsafe Condition This AD was prompted by mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as an airspeed indicator (ASI) with speed markings inconsistent with the approved and published values (beginning of the white and green arc). The FAA is issuing this AD to prevent erroneous information being provided to the pilot, particularly at the lower speed operation limits. The unsafe condition, if not addressed, could result in reduced control of the glider. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) Within 30 days after the effective date of this AD, inspect ASI part number (P/N) IF-W230 or IF-W190 for incorrect markings in accordance with the table in the Appendix, "2.3. Airspeed Indicator Markings," of Stemme Service Bulletin No. P062-980027, Revision 00, dated December 17, 2018 (the SB). If an ASI marking is incorrect, before further flight, perform one of the following: (i) Replace the ASI by following the Actions, Action 2, of the SB; or (ii) Amend the existing aircraft flight manual (AFM) for your glider by inserting the Appendix, temporary page 2-3 SB, "2.3. Airspeed Indicator Markings," of the SB. Within 3 months after amending the AFM, replace the ASI by following the Actions, Action 2, of the SB and remove temporary page 2-3 SB, "2.3. Airspeed Indicator Markings," from the AFM. (2) As of the effective date of this AD, do not install ASI P/N IF-W230 or IF-W190 on any glider unless it has passed the inspection required by this AD. (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 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 certification office, send it to the attention of the person identified in paragraph (i)(1) of this AD or email: [email protected]. (2) 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. (i) Related Information (1) 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; fax: (816) 329-4090; email: [email protected]. (2) Refer to European Union Aviation Safety Agency (EASA) AD 2019-0082, dated April 12, 2019, for more information. You may examine the EASA AD in the AD docket at https://www.regulations.gov by searching for and locating it in Docket No. FAA-2021-0716. (j) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Stemme Service Bulletin No. P062-980027, Revision 00, dated December 17, 2018. Note 1 to paragraph (j)(2)(i): This service information has Feb-29 and July 14, 2017, in the footer of every page on the document. Feb-29 refers to the form number and July 14, 2017, is the revision date of the form used to write the service information. The signature block on the bottom of page 1 contains a release date and an approval date. For enforceability purposes, the FAA will cite the Stemme AG service information using the release date of December 17, 2018, that is used in EASA AD 2019-0082, dated April 12, 2019. Note 2 to paragraph (j)(2)(i): This service information contains German to English translation. EASA used the English translation in referencing the document from Stemme AG. For enforceability purposes, the FAA will cite the Stemme AG service information in English as it appears on the document. (ii) [Reserved] (3) For service information identified in this AD, 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: https://www.stemme.com. (4) You may view this service information at 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 (816) 329-4148. (5) You may view this service information that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email: [email protected], or go to: https://www.archives.gov/federal-register/cfr/ibr-locations.html. Issued on October 25, 2021. Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2021-27774 Filed 12-22-21; 8:45 am]BILLING CODE 4910-13-P