Airworthiness directives › 2026-15-08
AD 2026-15-08 Airworthiness Directives; Stemme GmbH Gliders
Applicability*9
This AD applies to all Stemme GmbH Model Stemme S 12 gliders, certificated in any category. Note 1 to paragraph (c): All of the affected airplanes were produced and delivered with the affected copper sealing rings installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For the purpose of this AD, the definitions in paragraphs (g)(1) through (4) of this AD apply. (1) An “affected location” is any of the following: (i) The copper sealing ring within the fuel pump set assembly having part number (P/N) 128201, between the screw-in adapter having P/N 831099 and the fuel distributor having P/N 128229, and between the screw-in adapter having P/N 831099 and the fuel distributor having P/N 128228. The fuel pump set assembly P/N 128201 is located at the front left area of the middle fuselage and may be accessed from below when the main landing gear is extended. (Location defined in Stemme Service Bulletin (SB) P062-980082, Revision 01, dated July 15, 2025, Page 1 of 3, Action 2 and Figure 1). (ii) The copper sealing ring within the drainer complete having P/N 128207, between the screw-in adapter having P/N 831099 and the drainer attachment having P/N 128271. The drainer complete P/N 128207 is located at the main landing gear bay and may be accessed from below when the main landing gear is extended. (Location defined in Stemme SB P062-980082, Revision 01, dated July 15, 2025, Page 2 of 3, Action 3 and Page 3 of 3 Figure 2). (2) An “affected part” is a copper sealing ring having P/N D7603-12016-CU. (3) “Group 1 gliders” are gliders that have an affected part installed. (4) “Group 2 gliders” are gliders that do not have an affected part installed.
Unsafe condition
This AD was prompted by reports of fuel leaking around certain copper sealing rings within the fuel system. The FAA is issuing this AD to prevent fuel leakage in the fuel system. The unsafe condition, if not addressed, could result in an in-flight fire.
Affected ADs
None.
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