Airworthiness Directive · Amendment 39-18885 · Propellers/propulsors
Stemme AG Gliders
Superseded. A later AD replaced this one: AD 2018-03-16. Comply with the one in force.
This AD applies to Stemme AG Model S10-VT gliders (type certificate previously held by Stemme GmbH & Co. KG), 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.
| 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.
We are adopting a new airworthiness directive (AD) for Stemme AG Model S10-VT gliders (type certificate previously held by Stemme GmbH & Co. KG). This AD results from 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 certain propeller front transmission gear wheels having insufficient material strength because of improper heat treatment during manufacturing. We are issuing this AD to require actions to address the unsafe condition on these products.
Unless already done, do the following actions.
(1) Before further flight after June 15, 2017 (the effective date of this AD), replace the front gearbox following a method approved specifically for this AD by the FAA, Small Airplane Directorate. Contact the FAA using the information in paragraph (g)(1) of this AD to obtain FAA-approved repair instructions approved specifically for compliance with this AD and incorporate those instructions.
Note 2 to paragraph (f)(1) of this AD: At the issue date of this AD, no design solution is available to restore the airworthiness of the respective type design to a level corresponding to its approved type design specifications.
(2) As of June 15, 2017 (the effective date of this AD), do not install a front gear box listed in paragraph (c) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
