Steve – the two accidents to which you probably refer are the Birgenair B757 (blocked pitot, or should that be “peto”, don’t you just love journos?) and the AeroPeru B757 (blocked static ports), both in 1996. Read the reports on http://aviation-safety.net/index.shtml Having tried the the AeroPeru scenario on the simulator, it is a very alarming and confusing situation to find yourself in – read the Birgenair report and you see they had almost simultaneous stall and overspeed warnings. Having worked out what the problem was, we managed to fly the sim using the radio altimeter (which is only effective within 2500ft of the ground) and groundspeed readout from the IRS (Inertial Reference Systems).