Airworthiness directives › 2021-23-01
AD 2021-23-01 Airworthiness Directives; Stemme AG Gliders
Applicability*9
This AD applies to Stemme AG Model Stemme S 12 gliders, all serial numbers, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
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 (beginning of the white and green arc). The FAA is issuing this AD to prevent erroneous information being provided to the pilot, particularly at the lower speed operation limits. The unsafe condition, if not addressed, could result in reduced control of the glider.
Affected ADs
None.
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