ASK 18 student solo: stall on slip exit in final approach

An ASK 18 student on a 4th solo of the day at Essen/Mülheim was established in a slip on final when attempting to change direction or recover; nose came too high on slip exit, the glider stalled, dropped off right, and spun at low altitude into a parking lot ~400 m short of the airfield. Student: 20 h total / 34 starts on type; the slip exercise had been signed off as 'mastered' less than a month earlier. The solo order was issued without a current dual check despite a multi-day pause; training records were incomplete across 8 instructors. Glider destroyed; student fatal.

1. Winch launch and circuit: 4th solo of the day on ASK 18. Winch launch from Essen/Mülheim rwy 24; downwind, base, and altitudes on pattern observed correct by the supervising instructor from the ground. CAVOK, 270° at 4 kt, 16 °C.
2. Limited consolidation on type: Student training began Apr 2017; A-Prüfung Sep 2017, B-Prüfung Apr 2018. Converted to ASK 18 in Sep 2017 after only 3 solos on ASK 21. Total experience 20:17 h / 197 starts; 34 starts on ASK 18 total. BFU notes that 3 solos on the previous type is insufficient consolidation before single-seat conversion; no clear national standards exist for type-conversion timing.
3. Solo authorized without dual check: Slip exercise (2.7) signed off as 'beherrscht' only on 2 Sep 2018, less than a month before the accident. After a multi-day flying pause, the solo flight order was issued without a current dual check. BFU contributing-factor finding: a dual check should have happened before the solo order. Training records: 8 instructors involved over the training course; documentation incomplete and not used for progress tracking.
4. Low-altitude slip exercise zone: Per DAeC methodology, the slip exercise must end by 50 m AGL — a low-safety-margin exercise that requires careful pre-authorization risk assessment under the operator's SMS. BFU found the ATO's SMS was nominal only.
5. Slip exit error in final approach: Witness observation: a stable slip was established in the end part of final, then the student attempted to change the slip direction or exit; on slip exit the nose came too high. BFU notes both scenarios (slip exit vs slip direction change) lead to the same stalled state and treats them as equivalent triggers.
6. Stall and spin entry: Aircraft stalled, dropped off to the right, and entered a spin-like rotation at very low altitude before disappearing behind trees.
7. Parking lot impact - fatal: Near-vertical impact in a parking lot ~400 m east of (short of) the airfield. Fuselage front buckled upward, tail section broken, rudder separated. Glider destroyed; student sustained fatal injuries (polytrauma). No technical defects; no health impairment.