Airworthiness Directive · Amendment 39-15317 · Electric power
DG Flugzeugbau GmbH Model DG-500MB Gliders
This AD applies to Model DG-500MB gliders, all serial numbers, certificated in any category.
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 90 days after February 7, 2008 (the effective date of this AD):
(1) Secure the connection between the spindle drive “Stross BSA10” and the spindle drive motor following DG Flugzeugbau GmbH Working instruction No. 1, dated January 23, 2006, as referenced in DG Flugzeugbau GmbH Technical Note No. 843-24, dated January 31, 2006.
(2) Replace the fork 8M233/1 from the spindle drive with the strengthened fork 8M233“f”; replace the bearing support with the modified support 8M229“e”; and secure the spindle drive fork between the spindle drive “Stross BSA10” and the spindle drive motor following DG Flugzeugbau GmbH Working instruction No. 2, dated January 30, 2006, as referenced in DG Flugzeugbau GmbH Technical Note No. 843-24, dated January 31, 2006; DG Flugzeugbau GmbH Drawing 5M210, Spindle drive Stross BSA 10 assembly, issued: January 22, 2003, revised: May 19, 2006; and DG Flugzeugbau GmbH Drawing 5M211, Spindle drive Stross BSA 10 assembly with strengthened fork 8M233“f”, issued: January 23, 2006.
Note 1: We recommend that you insert and update the new Flight Manual pages 0.1, 0.3, 0.4, 2.8, 3.7, 3.8, 4.1, 4.25, 4.26; the new Maintenance Manual pages 1, 2, 3, 4, 5, 42, 49, 68, 89, 89a, 93, and Enclosure 1; and the new Repair Manual pages 1, 2, 7, and 8 following DG Flugzeugbau GmbH Technical Note No. 843-24, dated January 31, 2006.
Note 2: This AD differs from the MCAI and/or service information as follows: (1) The service information specifies a one-time inspection of the fork and requires replacement if cracks are found. This AD requires mandatory replacement of these parts with redesigned parts. The FAA believes mandatory replacement rather than inspection will prevent failure of these parts in the future. (2) The MCAI requires, for gliders certificated for operation in Germany, to have the pages in the flight, maintenance, and repair manuals exchanged.We have determined that the exchange of these pages is outside the scope of what is needed to correct the unsafe condition for gliders certificated for operation in the United States.
