Hi all
With regard to "expired" life on an airframe, I'd say that the Fougas were grounded as they came up for a major inspection, so as not to spend money on carrying out a check on an aircraft that was being retired. The Fougas all had comparatively low total flight times so would be viable for return to service. There might be a special inspection due on the spars or such like but nothing beyond the abilities of the Austrians. 217 is fully intact, with no damage or major repair history. It could be made airworthy in a few months.
regards
GttC