AD Grob 109

Bericht door **Webmaster** » 25 jul 2012, 22:53

Corroded and cracked elevator control road in the vertical fin on a Grob G 109B
powered sailplane has been reported.
The technical investigation revealed that water had soaked into the elevator
control rod through a control bore hole and resulted in corrosion damage and,
in case of water freeze between the external control rod and the internal mass
balance, in crack of the elevator control rod in the vertical fin.