Mr. Machinbird
You state as certain a flaps config for TO:
In the process of selecting flaps from 28 to 15, the control was mis-handled or defective (depending on the original design concept) and was inadvertently selected to full up.)
In Tu-154 -
AFAIK- TO procedures are very variable, depending on several factors. It's a fully "analogic" design of the 60's.
Previously (post # 276) is shown a TO -from zero- with a 15º flaps config.
There are two certain data to the moment:
a.- flaps were at 0º at the moment of impact
b.- we ignore the preferred configuration selected by crew.