Airworthiness Directive · Amendment 39-21799 · Airspeed/mach indicator
Stemme AG Gliders
This AD applies to Stemme AG Model Stemme S 12 gliders, all serial numbers, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Stemme AG 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 describes the unsafe condition as an airspeed indicator (ASI) with speed markings inconsistent with the approved and published values. This AD requires inspecting the ASI markings and, depending on findings, either replacing the ASI or amending the existing aircraft flight manual (AFM) until the ASI is replaced. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within 30 days after the effective date of this AD, inspect ASI part number (P/N) IF-W230 or IF-W190 for incorrect markings in accordance with the table in the Appendix, “2.3. Airspeed Indicator Markings,” of Stemme Service Bulletin No. P062-980027, Revision 00, dated December 17, 2018 (the SB). If an ASI marking is incorrect, before further flight, perform one of the following:
(i) Replace the ASI by following the Actions, Action 2, of the SB; or
(ii) Amend the existing aircraft flight manual (AFM) for your glider by inserting the Appendix, temporary page 2-3 SB, “2.3. Airspeed Indicator Markings,” of the SB. Within 3 months after amending the AFM, replace the ASI by following the Actions, Action 2, of the SB and remove temporary page 2-3 SB, “2.3. Airspeed Indicator Markings,” from the AFM.
(2) As of the effective date of this AD, do not install ASI P/N IF-W230 or IF-W190 on any glider unless it has passed the inspection required by 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.
Aircraft
