SZD 30-C Pirat — tow rope didn't release, wing structural failure

The pilot of an SZD 30-C Pirat was killed when its wing failed during an abrupt recovery after an aerotow rope would not release at Jena-Schöngleina; glider destroyed, the tug landed safely. At ~600 m AGL the glider pilot called 'I'm free' but the rope had not released. The Wilga tug was pulled into a dive and recovered at ~300 m. The rope then broke — it lacked a proper metal weak link, only a tape-wrapped knot — and the Pirat's wing failed under overload during the pilot's abrupt recovery.

1. Aerotow climb: The Pirat glider was aerotowed by a Wilga 35 from Jena-Schöngleina and climbed normally to about 600 m toward the release area.
2. Release misperceived: At about 600 m in the release area, the tow pilot signalled for release and the glider pilot transmitted “I am free,” although the tow rope in fact did not detach from the glider.
3. Tow rope setup: The tow rope lacked a proper metal weak link and instead had a knot as an additional weak point, letting the rope reach a breaking load well above the glider's specified 500 daN tow limit.
4. Glider climbs to turn: Believing he was released, the glider pilot pulled up to initiate the standard right turn away from the tow plane as prescribed after tow release.
5. Towplane forced dive: The still-attached rope tightened, pitching the Wilga's tail up into a steep dive of about 300 m and pulling the glider downward, while high rope tension prevented the pilot from releasing.
6. Rope break and overload: The overstressed tow rope broke at the glider end under ~1,094 daN; the resulting loads caused in-flight failure of the wing center section and separation of major parts.
7. Crash - fatal: The glider's fuselage descended steeply and impacted terrain near Großlöbichau, fatally injuring the pilot; the towplane recovered from the dive and landed undamaged.