yeah...planes have a concept of maneuvering airspeed, where you can fully deflect control surfaces without damaging the aircraft. but higher than that airspeed you can cause structural damage. even below that if you don&#x27;t just deflect but dynamically go back and forth just right.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;American_Airlines_Flight_587" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;American_Airlines_Flight_587</a><p>presumably the 1.5 refers to the plane flown within design limits in statistically &#x27;normal&#x27; meteorological conditions ie turbulence.