PJ2, yes, if they had maintained level flight they wouldn't have gotten an overspeed, but if he climbed for whatever his reason with trapped pitot pressure and reducing static pressure he may have gotten an overspeed warning that caused him to pull up into a stall. Normally a pilot wouldn't do that but for some reason he did. Unfortunately the captain wasn't there at the time to prevent it, if that is what happened. I hope they don't drag their feet on releasing the FDR and CVR reports because this could happen again if they sit on it. The aircraft they were flying was already known to have faulty pitot tubes but hadn't been changed yet when this accident happened.