lauantai 24. marraskuuta 2018 13.22.29 UTC+2 kirjoitti:
There's a difference between what is technically possible and what is legally allowed. There's an interesting read in the "Schleicher-book": before the 18,000h lifetime extension on the ASK21 was approved, a wing was tested in a fatigue evaluation program. This program received public funding by the German government. The intention was to get approval for 24,000h, but the program was running out of funds before that was accomplished. So far, the ASK21 is the only German FRP-glider with 18,000h service life.

I guess german authorities are still holding their collective breath because FRP structures are so new thing that no one really knows how they behave. Just 60 years in service, it can disintegrate any minute without warning.