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Highly energetic, variable and distant sources such as Active Galactic Nucleiprovide a good opportunity to evaluate effects due to the emission and thepropagation of high energy photons. In this note, a study of possibleenergy-dependent time-lags with PKS 2155-304 light curve as measured byH.E.S.S. in July 2006 is presented. These time-lags could either come from theemission processes or also sign a Lorentz Symmetry breaking as predicted insome Quantum Gravity models. A Cross-Correlation function and a WaveletTransform were used to measure the time-lags. The 95% Confidence Limit on theQuantum Gravity energy scale based on the statistical and systematic errorevaluation was found to be 7x10^17 GeV considering a linear correction in thestandard photon dispersion relations and assuming that emission-inducedtime-lags are negligible. For now, this limit is the best ever obtained with ablazar.

Search for Lorentz Invariance Violation effects with PKS 2155-304 flaring period in 2006 by H.E.S.S