TOGA button issue
Some new info not discussed here so far.
According to the people who know the TU-154, it is very clear that no attempt to disengage the autopilot from the programmed descend mode was made until the navigator reads 20 meters as the altitude. The TU-154 autopilot automatically disengages the different control channels when the controls are moved/forced manually, at which point the autopilot gives distinctive 400 Hz signal that is shown in the transcript as F=400 Hz. ABSU, with three of those corresponding to different autopilot channels being disengaged as a result of the pilots moving the controls and throttle, which only happened 2 seconds before the first tree was hit and 5 seconds after the first ATC "horizon" command.
Other Polish Tu-154 pilots are completely at a loss to explain all that.
http://www.flightgear.ru/wiki/index.php/Tu-154B_ABSU