....or of course bad cockpit design/layout....
Take the collective AP beep-trim on the S-92, that can contol what height Rad-Alt one is flying. It's next to the china-hat that controls the searchlight!
That's not exactly ideeal when approaching a rig at night, ecpecially as SOP says we are supposed to be coupled to Rad-Alt below 1000' (wich I think is smart at night).