Eroneous airspeed indications in a climb with blocked pitot tube
Just for interest I put the Nimrod simulator into a climb between F350 and F370 and then blocked the starboard pitot tube. The airspeed and the mach number rose rapidly and the pilot raised the nose to bring the speed back which made the (apparent) overspeed worse. The correct IAS was shown on the port instrument panel but the mach number (which is driven by the same source as the stbd instrument) continued to show the very high mach number. The pilot closed the throttles and deployed the airbrake. There was then some stall buffet which the pilots misinterpreted as mach buffet, and so on (the artificial stall warning does not work well at this flight level). The mach protection then operated, giving a pitch up which made matters even worse. It is a very different aircraft, but it shows how little reliable information you have got in these circumstances. When teaching pitot static diagnosis I usually advocate levelling off, as it at least stops things getting worse. But if the problem is on the static side, this too is difficult.