Summary
We propose to adopt a new airworthiness directive (AD) for Intreprinderea De Constructii Aeronautice Model IS-28B2 gliders. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as cracks at stringers in the rear fuselage of several Model IS-28B2 gliders. We are issuing this proposed AD to require actions to address the unsafe condition on these products.