On Friday, 19 October 2018 13:15:04 UTC-4, Jock Proudfoot wrote:
Gliding International posted -ASK 21 is grounded after November 30

Who knows what ?

This from a "Reliable Source":
The Australian GFA (equivalent to Transport Canada) has issued a national AD for the ASK 21 because of a discovery of very fine hairline cracks in the glue joint between the wing skin and spar at the root rib. In his view, this is an overreaction and was also not discussed previously with the factory. Apparently, the GFA will soon be issuing a second AD which will allow the ASK 21s to resume normal flying operations. Both ADs only apply to ASK 21/ ASK 21 Mi sailplanes registered in Australia.