Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all HPH s.r.o. (HPH) Models Glasflu gel 304CZ, 304CZ-17, and 304C sailplanes. This proposed AD would require you to inspect to determine the airbrake handle attachment rivet material. This proposed AD would require you to replace any non-steel rivet with a steel rivet. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for the Czech Republic. We are issuing this proposed 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.