Airworthiness Directive · Amendment 39-15132 · Propellers
Stemme GmbH & Co. KG Model S10-V and S10-VT Powered Sailplanes
This AD applies to Models STEMME S10-V and STEMME S10-VT powered sailplanes, all serial numbers, that:
(1) Are certificated in any category; and
(2) Have not incorporated the actions in their entirety of STEMME F & D SB A31-10-078, Am.-index: 01.a, dated November 6, 2006, which references STEMME F & D Installation Instruction A34-10-078-E, Am.-index: 01.a, dated February 20, 2007.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, within the next 25 engine operating hours after August 28, 2007 (the effective date of this AD) or 90 days after August 28, 2007 (the effective date of this AD), whichever occurs first, do the following actions:
(1) Replace the blade follower type 10AP-VM with the new type 10AP-VP following the instructions contained in STEMME F & D SB A31-10-078, Am.-index: 02.a, dated March 2, 2007, which references STEMME F & D Installation Instruction A34-10-078-E, Am.-index: 01.a, dated February 20, 2007.
(2) As of 25 engine operating hours after August 28, 2007 (the effective date of this AD) or 90 days after August 28, 2007 (the effective date of this AD), whichever occurs first, do not install a propeller type 10AP-F, 10AP-V or 11AP-V on any aircraft, unless that propeller has the new type 10AP-VP blade follower installed following the instructions contained in STEMME F & D SB A31-10-078, Am.-index: 02.a, dated March 2, 2007, which references STEMME F & D Installation Instruction A34-10-078-E, Am.-index: 01.a, dated February 20, 2007.
Note: This AD differs from the MCAI and/or service information as follows: The MCAI requires an amendment to the aircraft flight manual before further flight as an interim requirement to the replacement. We consider before flight as an urgent safety of flight compliance time, and we do not consider this unsafe condition to be an urgent safety of flight condition. We feel that 25 engine operating hours or 90 days, whichever occurs first, for the replacement is an adequate compliance for this AD action. We do encourage you to incorporate these flight manual amendments referenced in the MCAI and service information until you replace the propeller blade follower.
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.
