L-13 Blaník falls off steep bank at airfield edge after tailwind landing

On a training flight at Letkov, an L-13 Blaník landed with a tailwind and ran off a steep bank at the airfield edge; instructor and student were unhurt, but the glider was substantially damaged. Practising a confined-area landing, the crew approached across the runway with about 11 km/h of tailwind. The glider touched down about 60 m past the threshold at about 95 km/h (the handbook approach speed). The roll slowed less than expected; both pilots braked with little felt effect, and the instructor did not put a wing down to swing the glider round. After about 192 m it went over the edge and fell about 2 m onto its nose.

1. Dual aerotow from Letkov: The instructor and student were aerotowed from RWY 26 at Letkov at 17:24 for a confined-area landing exercise and released at about 250 m AGL.
2. Approach across the runway: With the windsock showing a west to north-west wind, the instructor lost height in about three steeper turns; the student then flew the briefed approach on about 040°, at 45° across the runway.
3. Tailwind touchdown at 95 km/h: After a sideslip over tall maize, the glider touched down about 60 m past the RWY 26 threshold at about 95 km/h, with full airbrakes and flaps and a tailwind component of about 11 km/h.
4. Braking with little felt effect: The ground roll did not slow as the crew expected. Both pilots pulled the wheel-brake lever and felt little or no effect; the later maintenance inspection found no fault in the brake control.
5. No wing put down: The glider ran on nearly straight, bearing slightly right after about 80 m; the instructor concentrated on the brake and did not put a wing down in time to swing it round before the obstacles.
6. Fall off a 2 m bank: After about 192 m the glider went over the edge of the airfield at low speed and fell about 2 m down a steep bank onto its nose. Both occupants were unhurt.