SAMPLE TEST PROGRAMFabrication, design and full-scale test of winglet
Intec conducted a full-scale FAA certification test program for APB's 737-BBJ blended winglet.
Boeing 737
The 12-foot winglet was designed to improve the performance of the BBJ (Boeing Business Jet). Certification tests were performed on Intec's strong back and load floor, and consisted of these load cases: up, down, and torsion. Multiple actuators applied load through 3 wiffle trees and up to load pads to simulate aerodynamic loads.
Full-scale winglet test
Schematic
Intec designed and built all load introduction and reaction fixturing. Solid models of both fixturing and test articles were used to simulate placement and interference while modeling (FEA) load introduction and reaction for stiffness and strength. Reaction fixtures were designed for more than 500,000 in-lbs bending moment with less than 0.02 overall deflection. More than 100 strain and deflection transducers were monitored while an MTS dual slaved control system supplied a fail-safe load environment.
As part of certification, the winglet must demonstrate its ability to carry the critical load conditions with no permanent damage or deformation at limit load. After successful limit load verifications, the winglet was ultimately loaded to failure. The specific aim of this test was to show compliance with FAR 25.305 (a)(b) and 25.307.
Sample Programs
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