Uudiseid Blaniku kohta

http://www.aircraftdc.de/ENG/visionen_blanik.htm
http://www.aircraftdc.de/ENG/images/Blanik/Customerinfo_ADxC-DC-39-001.pdf

L-13 Blanik update

Below is an extract from the press release which was issued on April 8, 2011.

Aircraft Design and Certification Ltd. (AD&C) is developing a supplemental type certification (STC),
including a structural modification as well as an inspection and replacement program, as method of
compliance for EASA-AD-2010-0185-E. The approval process utilized a cooperation arrangement with
the type certificate holder Aircraft Industries (formerly “LET”). The STC is now available at AD&C.
The STC is based on elaborate 3D geometry and load path analysis (by reverse engineering) and is
verified by high quality finite element method (FEM) calculations and structural testing including
strain verification. Even individual rivet/bolt load analysis has been performed to identify the root
cause of the problem. The well known and approved load spectra KosMos, incorporating a realistic
quantity of aerobatic maneuvers, is adapted and applied for the analysis of the Blaník wing and
fuselage carry through sections. Further analysis includes the horizontal tail attachment area. Based
on the findings of the analyses 3 new parts have been designed and installed to improve the load
transfer from wing spar to fuselage. Hi-Lok® bolts, known to have superior fatigue resistance, are
used to exchange the critical rivet in rivet spar cap connections and to ease later inspections in the
affected areas.
Currently the STC is at final approval stage by EASA; approval by FAA has been applied for. Current
types of aircraft are the L-13, the L-13A will be included shortly. The permissible operational life of
the modified area is prolonged to a total of at least 6000h (irrespective of the accuracy of individual
historical records), however the limitations of the rest of the aircraft cannot be changed, without
according in depth analysis, from the original 3750h. AD&C is considering a further program for a
general life time extension, pending on market response.
The modification can be installed at any Part-145/Part-M or equivalent approved maintenance
organisation having the Blaník within their scope of approval. In the course of the modification,
personnel approved (EN 4179 or NAS 410) for non-destructive testing utilizing Eddy current, optical
(borescope) and dye penetrant inspection techniques is required.