We had an inflight spar fracture of a CAP 10 in Germany in July 2001, killing the flight instructor and the student during aerobatic training. For those who understand german the
anual report of the air accident inverstigation department (BFU) might be of interest (first chapter on page 17).
The BFU recommends to limit the CAP 10 to Utility category and to avoid rough airstrips, because the fracture was related to small damages at the undercarriage attachment to the wing spar !
A more detailled report can be found on page 21 of this
bulletin, the final accident report is still not finished.
During the last annual check, small cracks (not unusual to wooden planes) were found in the paint near the wing root and near the undercarriage attachment point. If you own or fly a CAP, check it carefully and take even small annormalies very serious. (of course this should apply to any plane you fly). Wooden planes have normally no problems with fatigue or corrosion, but they should be maintained with the same care in this respect, small cracks in the paint, water ingestion over longer period, and your structural strength might be no longer sufficient for aerobatics.
Anyway enjoy flying your CAP within the allowable limits.