Blaník Wing Modification
- CS-22 STC
- Regaining Airworthiness
- Design and Certification
With over 3000 gliders built since 1956, the Blaník L13 is the most produced glider worldwide.
In June of 2010, a fatal accident in Austria resulted in the worldwide grounding of the entire active L13 and L13A fleet. The reason for this grounding was to a large extent the suspicion of premature fatigue in the load path of the main wing spar. AD&C assumed the laborious task of putting this historic glider back in the air.
This task consisted of:
- Reconstruction of the 3D geometry of the aircraft, in particular the area of the main wing spar;
- Load path analysis;
- Verification by elaborate FEM calculations;
- Fatigue life investigation;
- Crack propagation calculations;
- Definition of useful life with and without (undetected) damage;
- Design of structural modification aimed at:
- reducing the stress levels, and therefore increasing the useful life;
- Facilitating the inspectability of critical areas;
- Definition of an inspection program, using NDT (Non destructive testing) techniques to periodically assess the state of the aircraft's critical areas.