Jay Maynard writes: How often do we tell computer users to just reboot it and see if the problem goes away? The FAA is now doing just that. They've issued an airworthiness directive — an order that must be complied with in order for an aircraft to be legal to fly — that requires operators of Boeing 787 Dreamliners to completely power off the aircraft at least every 21 days in order to reset the systems. The reason? They had received reports that all three flight control computers would simultaneously reset themselves on day 22.