Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2004-08-13, which applies to certain BURKHARDT GROB LUFT-UND RAUMFAHRT GmbH & CO KG (Grob) Models G103 TWIN ASTIR, G103 TWIN II, G103 TWIN III ACRO, and G103C Twin III SL sailplanes. AD 2004-08-13 currently requires you to replace the center of gravity (CG) release hook attachment brackets with brackets of improved design. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. This proposed AD would retain all the actions required in AD 2004-08-13 and add Model G103A TWIN II ACRO sailplanes to the applicability. The actions specified by this proposed AD are to prevent abnormal or uncontrolled sailplane release due to cracked CG release hook attachment brackets. This condition could result in reduced or loss of sailplane control.