Airworthiness Directives; HPH s. r. o. Models Glasflügel 304CZ, 304CZ-17, and 304C Sailplanes

The FAA adopts a new airworthiness directive (AD) for certain HPH s. r. o. (HPH) Models Glasfl[uuml]gel 304CZ, 304CZ-17, and 304C sailplanes. This AD requires you to inspect to determine the airbrake handle attachment rivet material. This AD also requires you to replace any non-steel rivet with a steel rivet. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the Czech Republic. We are issuing this AD to prevent the airbrake handle from becoming loose, which could result in failure of the airbrake control. This failure could lead to loss of control of the sailplane.