Sylvain Alarie and Gilles Primeau, experts on the horizontal stabilizers, observed anomalies in the data from the aircraft data recorders: a progressive shift of 0.2 degrees of the horizontal stabilizer, before the crash. "It may not seem like much, but it is an order of magnitude higher than what is normally allowed when designing systems like these", says Gilles Primeau. They say that the movements are easily observable, and disallowed according to Regulation 395A.