So, is there every a good argument for changing/ignoring what a manufacturer asks to do?
Can think of a 747 incident where the airline SOP didn't conform with the manufacturers and crew became unsure of usable fuel state, BA three engine LAX - UK. QF over run BKK using procedures manufacturer didn't endorse. Used to fly a particular type where interruption of pre start check often resulted in engine start with fuel off, would run for about two seconds before rapid movement of fuel lever instantly restored the noise.