Airworthiness directives › 2022-14-11
AD 2022-14-11 Airworthiness Directives; Stemme AG (Type Certificate Previously Held by Stemme GmbH & Co. KG) Gliders
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
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 a deviation in the construction of the connection of the inner wing to the outer wing, resulting in a wrong positioning of the left-hand (LH) and right-hand (RH) outer wing spar glass-fiber reinforced plastic (GFRP) blocks. The FAA is issuing this AD to detect wrong positioning of the GFRP blocks, which, if not corrected, could cause a rupture of the affected wing and consequent loss of control of the glider.
Affected ADs
None.
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