Agreed, PJ, nothing new under the sun, and it has been happening since the first pilot took off with his pitot head cover or static port plug in place, but as I said before (4031 and earlier) what appears to be new is either a multiple failure of probes or some software effect. All the 'examples' we are getting here involve ONE of the sensors. I think, however, the ?AeroPeru' crash had all the statics blocked?