Re:Boeing wants FAA to exempt MAX 7 from safety rules to get...
by tialaramex on Friday January 05, 2024 @05:38PM
(#38885997)
And in large ships, the Bridge Navigational Watch Alarm System or BNWAS.
Over night most normal operations cease, so it's quiet on the bridge. But an officer is on duty to keep watch, because the ship is still moving, often relatively fast, and it needs a human to obey pre-existing route plan decisions, observe changing conditions, stay alert to other vessels and so on. However, the bridge (on a modern large ship) is warm and dark and at night tired humans in warm dark rooms will sleep.
So BNWAS will (if operating correctly) periodically need to be "nudged" to show that the officer on watch is awake and somewhat paying attention. If they do nothing for a while the BNWAS will alert them and if they ignore that it will eventually alarm critical crew, often the Master ("Captain") of the ship or other senior officers who are asleep in their cabins.
Now of course nobody wants to leave a nice dream to discover that instead of your teenage girlfriend agreeing to go on that picnic you never got to that sound is their boss, very angrily demanding to know what the fuck you're doing curled up by the radar console. So unfortunately sometimes after a serious incident (e.g. cargo ship has "decided" to wait right next to a small island a few miles from the usual route from 4am until midday, and then when it gets to a dock it seems very smashed up at the bottom as though it was grounded and had to wait until higher tides lifted it clear...) we find the BNWAS has been disabled crudely (it's not as though ship's crew tend to be IT experts)...
But this is a completely different scenario. The BNWAS is not something which causes a disaster if you forget to react, it's an alarm to prevent such disasters which would otherwise be commonplace.
Over night most normal operations cease, so it's quiet on the bridge. But an officer is on duty to keep watch, because the ship is still moving, often relatively fast, and it needs a human to obey pre-existing route plan decisions, observe changing conditions, stay alert to other vessels and so on. However, the bridge (on a modern large ship) is warm and dark and at night tired humans in warm dark rooms will sleep.
So BNWAS will (if operating correctly) periodically need to be "nudged" to show that the officer on watch is awake and somewhat paying attention. If they do nothing for a while the BNWAS will alert them and if they ignore that it will eventually alarm critical crew, often the Master ("Captain") of the ship or other senior officers who are asleep in their cabins.
Now of course nobody wants to leave a nice dream to discover that instead of your teenage girlfriend agreeing to go on that picnic you never got to that sound is their boss, very angrily demanding to know what the fuck you're doing curled up by the radar console. So unfortunately sometimes after a serious incident (e.g. cargo ship has "decided" to wait right next to a small island a few miles from the usual route from 4am until midday, and then when it gets to a dock it seems very smashed up at the bottom as though it was grounded and had to wait until higher tides lifted it clear...) we find the BNWAS has been disabled crudely (it's not as though ship's crew tend to be IT experts)...
But this is a completely different scenario. The BNWAS is not something which causes a disaster if you forget to react, it's an alarm to prevent such disasters which would otherwise be commonplace.
https://en.wikipedia.org/wiki/Bridge_navigational_watch_alar...