Engineers can have their hands tied as well, limiting their options to doing the job or resignation. Perhaps putting a guard on the vane would have only been n

Engineers can have their hands tied as well, limiting their options to doing the job or resignation. Perhaps putting a guard on the vane would have only been necessary if it was considered an intolerable failure and being flagged as an intolerable failure would have required a recertification of the plane or something. Just a guess.