Originally Posted by
Astra driver
"I wouldn't take any chances guessing what altitude you might maintain, I would just get everybody out of your way"
That is the correct answer and what we train our controllers here to do in this case.
Today, ( i.e since 2001) with simultaneous loss of comm and mode C , you can asume the worst.
Remember , if you find yourself in that situation, and for those of you that have ACARS or SATCOM to use it to contact ATC either direct or via your OPS.