Airworthiness Directive · Amendment 39-22116 · Wing structure
Stemme AG (Type Certificate Previously Held by Stemme GmbH & Co. KG) Gliders
This AD applies to Stemme AG (type certificate previously held by Stemme GmbH & Co. KG) Model Stemme S 12 gliders, serial numbers 12-002 through 12-042 inclusive and serial number 12-044, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Stemme AG (type certificate previously held by Stemme GmbH & Co. KG) Model Stemme S 12 gliders. 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 identifies the unsafe condition as a deviation in the construction of the connection of the inner wing to the outer wing, resulting in a wrong positioning of the glass-fiber reinforced plastic (GFRP) blocks. This AD requires inspecting the left-hand (LH) and right-hand (RH) outer wing spars for correct positioning of the GFRP blocks and, if incorrect positioning is found, repairing of the reinforcement blocks. The FAA is issuing this AD to address the unsafe condition on these products.
Before further flight after the effective date of this AD, inspect the LH and RH outer wing spars for positioning of the GFRP blocks by following Working Steps 1.1 through 3.2 in Stemme Procedural Instruction P320-912060, Revision 00, dated May 20, 2022.
(1) If a GFRP block is correctly positioned, seal the inspection holes by following Working Steps 4.1 through 4.3 in Stemme Procedural Instruction P320-912060, Revision 00, dated May 20, 2022.
(2) If a GFRP block is incorrectly positioned, before further flight, repair using a method approved by the FAA; the European Union Aviation Safety Agency (EASA); or Stemme AG's Design Organization Approval (DOA). If approved by the DOA, the approval must include the DOA-authorized signature.
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.
Aircraft
