CAGI was not reportedly asked to do any expert works concerning the disaster. Near the CAGI, south of Moscow at Zhukovky, also Gromov Flight Research Institute (LII) is located. Analysis of FDR and CVR did not help to find the reason of disaster, no system failure was found.
At this moment, LII specialists work on computer model of fatal flight. They use mathematics model of Tu-154B and recorded flight parameters from FDR (hight, IAS, angles, controls...) and they are trying to find the set of factors (TOW, CG, flaps falure etc.) that is fully compatible with actual data from FDR. For this reason they may be trying to do some special test in wind tunnel of CAGI (partly retracted gears, flaps..?).
In parallel, mechanical analysis of debris are provided to find any track of in-flight failure.