Airworthiness Directive · Amendment 39-15727 · Flight controls
DG Flugzeugbau GmbH Models DG-1000S and DG-1000T Gliders
This AD applies to Models DG-1000S and DG-1000T gliders with the following serial numbers (SN), certificated in any category:
(1) Group 1: SN 10-1 through 10-102 and 10-106 through 10-108.
(2) Group 2: SN 10-1 through 10-83, 10-85 through 10-87, 10-89 through 10-91, 10-93, and 10-94.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from 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:
Unless already done, do the following actions in accordance with DG Flugzeugbau GmbH Technical Note No. 1000/12, corrected January 7, 2008; DG Flugzeugbau GmbH Working instruction No. 1 for TN1000/12, dated November 30, 2007; DG Flugzeugbau GmbH Working instruction No. 2 for TN1000/12, dated November 30, 2007; DG Flugzeugbau GmbH Working instruction No. 3 for TN1000/12, corrected January 28, 2008; DG Flugzeugbau GmbH Working instruction No. 4 for TN1000/12, dated November 29, 2007; DG Flugzeugbau GmbH Working instruction No. 5 for TM1000/12, dated December 5, 2007; Section 4.4.2 of Maintenance Manual for the Glider DG-1000S, Issued: March 2002; and Section 4.4.2 of the Maintenance Manual for the Motorglider DG-1000T, Issued: June 2005, except for the addition of the placard requirement stated in paragraph (f)(2)(i) of this AD:
(1) For Group 1 Gliders:
(i) Before further flight as of November 26, 2008 (the effective date of this AD), inspect the torque of the nut which fixes bellcrank 5St19 to the bolt following Working instruction No. 1. If the measured torque is 3 Nm (2.2 ft-lb.) or higher, increase the torque to 12 Nm (9 ft-lb.).
(ii) If, as a result of the torque inspection required by paragraph (f)(1)(i) of this AD, you find the torque was less than 3 Nm (2.2 ft-lb.), before further flight, replace the bolt according to Working instruction No. 2. In such a case, within 7 days after the torque inspection, send a note by e-mail to design@dg-Flugzeugbau.de informing DG Flugzeugbau of the bolt replacement.
(iii) Within the next 90 days after November 26, 2008 (the effective date of this AD), install an additional bracket following Working instruction No. 3.
(2) For Group 2 Gliders:
(i) Before further flight as of November 26, 2008 (the effective date of this AD), install a placard in the pilot's clear view which states: “Aerobatic maneuvers are prohibited.” This placard must be removed and aerobatics reinstated once the airbrake control hook-up mountings have been reinforced or replaced following Working instruction No. 4 or 5.
(ii) Before further flight as of November 26, 2008 (the effective date of this AD), visually inspect the mountings of the airbrake control hook ups in the wing roots for any damage and inspect the overcenter locking moment following Technical Note No. 1000/12.
(iii) If, as a result of the inspections of the mountings of the airbrake control hook ups and the overcenter locking moment required by paragraph (f)(2)(ii) of this AD, you find any damage (visual cracks and/or moment force measures below 50 N (11 lbs.)), repair the damage following Working instruction No. 5. If damage is detected on only one wing, repair only the damaged wing. You must reinforce the undamaged wing as instructed in paragraph (f)(2)(iv) of this AD.
(iv) If you do not find any damage (no cracks or the measured overcenter locking movement is within the specified tolerance) as a result of the inspections of the mountings of the airbrake control hook ups and the overcenter locking moment required by paragraph (f)(2)(ii) of this AD, within the next 90 days after November 26, 2008 (the effective date of this AD), reinforce the mountings of the airbrake control hook ups in the wing roots following Working instruction No. 4.
Note: This AD differs from the MCAI and/or service information as follows: (1) This AD requires the installation of a placard for Group 2 gliders that states aerobatic maneuvers are prohibited, which is to be removed when the airbrake control hook-up mountings have been reinforced or replaced. The MCAI does not require installation of a placard. (2) DG Flugzeugbau GmbH Technical Note No. 1000/12, corrected January 7, 2008, states that instructions 1 and 4 may be executed by the owner. By FAA regulations, this AD requires all affected gliders to have the required actions done by an appropriately-rated mechanic. (3) The MCAI refers to the term “suspension;” the technical note instead uses the term “mounting.” This AD uses the term “mounting” for consistency with the technical note.
