Airworthiness Directive · Amendment 39-11341 · Burkhart Grob Luft-Und Raumfahrt GmbH & CO KG Models G103 TWIN II and G103A TWIN II ACRO Sailplanes
Burkhart Grob Luft-Und Raumfahrt GmbH & CO KG Models G103 TWIN II and G103A TWIN II ACRO Sailplanes
The following sailplane models and serial numbers, certificated in any category: Model Serial Numbers G103 TWIN II.............................. 3501 through 3729. G103A TWIN II ACRO........................ 3501K through 3729K.
This amendment adopts a new airworthiness directive (AD) that applies to certain Burkhart Grob Luft-Und Raumfahrt GmbH & CO KG (Grob) Models G103 TWIN II and G103A TWIN II ACRO sailplanes. This AD requires accomplishing preflight checks of the fastening (knurled) nut at the rear control stick for cracks, and replacing the nut with one made of stainless steel either immediately or at a certain time period depending on whether a crack(s) is found. The checks are no longer required after the knurled nut is replaced. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by this AD are intended to prevent the inability to use the rear control stick because of a cracked knurled nut, which could result in loss of control of the sailplane during flight instruction operations.
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.
