Airworthiness directives › 2018-03-16
AD 2018-03-16 Airworthiness Directives; Stemme AG Gliders
Applicability*9
This AD applies to Stemme AG Model Stemme S10-VT gliders (type certificate previously held by Stemme GmbH & Co. KG), all serial numbers, and Stemme AG Model Stemme S 12 gliders, all serial numbers, that are: (1) Equipped with a front gearbox, part number (P/N) 11AG, with a serial number listed in table 1 to paragraph (c) of this AD; and (2) are certificated in any category. Table 1 to Paragraph (c) of This AD—Affected P/N 11AG (Front Gearbox) S/Ns 80058/0814 80059/0915 80060/0915 80061/1115 80062/1215 80063/0116 80064/0416 80065/0616 80066/0716 80067/0916 80068/1016 80069/0117 80070/0217 80071/0217 Note 1 to paragraph (c) of this AD: Page 2 of Stemme AG Service Bulletin No. P062-980010, dated April 21, 2017, provides a pictorial of where the serial number of the affected gearboxes are located.
Compliance
Unless already done, do the following actions: (1) For Model Stemme S10-VT gliders: Before further flight after June 15, 2017 (the effective date of AD 2017-10-11), replace the front gearbox following STEMME Procedural Specification Dok. Nr.: P320-900060, as specified in STEMME Service Bulletin Dok. Nr.: P062-980010, Issue: 01, both dated June 14, 2017. (2) For Model Stemme S 12 gliders: Before further flight after March 20, 2018 (the effective date of this AD), replace the front gearbox following STEMME Procedural Specification Dok. Nr.: P320-900060, as specified in STEMME Service Bulletin Dok. Nr.: P062-980010, Issue: 01, both dated June 14, 2017. (3) As of March 20, 2018 (the effective date of this AD), do not install a front gear box listed in table 1 of paragraph (c) of this AD. (4) The service information for this AD allows the owner/operator to do certain maintenance tasks. Also, the service information specifies certain maintenance tasks be done by Stemme AG. However, for this AD, we do not allow the owner/operator to do any maintenance tasks; all maintenance tasks must be done by an appropriately certified mechanic or maintenance shop. In addition, we do not require any maintenance tasks be done specifically by Stemme AG; any appropriately certified mechanic or maintenance shop may do the tasks required by this AD.
Required actions
The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Small Airplane Standards Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Jim Rutherford, Aerospace Engineer, FAA, Small Airplane Standards Branch, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4165; fax: (816) 329-4090; email: jim.rutherford@faa.gov. (i) Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (ii) AMOCs approved for AD 2017-10-11, Amendment 39-18885 (82 FR 24239, May 26, 2017) are approved as AMOCs for the corresponding provisions of this AD. (2) Contacting the Manufacturer: For any requirement in this AD to obtain corrective actions from a manufacturer, the action must be accomplished using a method approved by the Manager, Small Airplane Standards Branch, FAA; or the European Aviation Safety Agency (EASA).
Unsafe condition
This AD was prompted by mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and address an unsafe condition on an aviation product. The MCAI describes the unsafe condition as certain propeller front transmission gear wheels having insufficient material strength because of improper heat treatment during manufacturing. We are issuing this AD to add a model glider to the Applicability, paragraph (c) of this AD, and to prevent failure of the propeller front transmission gear wheels. This failure could cause loss of power between the engine and the propeller, which could result in reduced control.
Affected ADs
This AD replaces AD 2017-10-11, Amendment 39-18885 (82 FR 24239, May 26, 2017) (“AD 2017-10-11”).
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