Airworthiness directives › 2004-08-12
AD 2004-08-12 Airworthiness Directives; Schempp-Hirth Flugzeugbau GmbH Models Ventus-2a, Ventus-2b, Discus-2a, and Discus-2b Sailplanes
Applicability*9
(c) This AD affects the following model and serial number sailplanes that are certificated in any category: Group Models Serial Nos. (1) Group 1 Sailplanes Discus-2a and Discus-2b sailplanes that do not have Shempp-Hirth Technical Note No. 360-16 incorporated 13 through 22, 24, 27, 30 through 48, 50, 51, 53, 54, 55, 57 through 63, 65, 67, 68, 71 through 79, 81, and 82. (2) Group 2 Sailplanes Ventus-2a, Ventus-2b, Discus-2a, and Discus-2b sailplanes Ventus-2a and Ventus-2b: 1, 2, 31, 32, 48, 54, 71, 117, 124 through 151, and 153; and all serial numbers that incorporate Modification Bulletin 349-42 or are equipped with a new tail unit per Shempp-Hirth Technical Note No. 349-27. Discus-2a and Discus-2b: 1 through 185, 187, 188, and 189.
Required actions
(e) To address this problem, you must do the following: Actions Compliance Procedures (1) For Group 1 sailplanes: Add a mass balance to the elevators and install an elevator pushrod in the vertical fin Within the next 25 hours time-in-service (TIS) after June 4, 2004 (the effective date of this AD), unless already done Follow Schempp-Hirth Technical Note No. 360-19, dated December 20, 2002 (LBA-approved January 18, 2003). (2) For Group 2 sailplanes: Modify the mass balance weights Within the next 25 hours TIS after June 4, 2004 (the effective date of this AD), unless already done Follow Schempp-Hirth Technical Note No. 349-28, No. 360-20, and No. 863-8 (including appendix), dated September 16, 2003 (LBA-approved September 23, 2003).
Unsafe condition
(d) This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions of this AD are intended to detect and correct problems within the sailplane elevator control system before they lead to flutter and sailplane instability. This could eventually result in loss of sailplane control.
Affected ADs
(b) None.
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