4 ms·
How do you account for oceans?
by mrfusion 6y ago
How do you account for oceans?
- alistairSH 6y agoBy staying as close to land as required to ensure safety. until fairly recently, flights to Hawaii were largely served by 3- or 4-engine jets. It's only in the last several decades that ETOPS regulations have shifted enough to allow regular twin-engine service to Honolulu. See the 3rd response... https://www.airliners.net/forum/viewtopic.php?t=119921 https://www.airliners.net/forum/viewtopic.php?t=119921
- disantlor 6y agoi think in part by having more than 2 engines on those flights
- Pasorrijer 6y agoVery few in service aircraft in commercial passenger fleets have more than two engines, and even the ones with more than two engines have modified ETOPS rules to comply with.
- midasuni 6y agoThe two that come to mind are the 747 and a380
- jrockway 6y agoBy having airports on islands, or by pushing up the number of minutes that the engines/operator are certified for.
- ufo 6y agoFor transatlantic flights, two important "backups" are in Iceland and in the Azores. I wonder how often airplanes actually have to detour to these airports...
- jfk13 6y agoIt happens: I was on an London - USA flight that detoured to Iceland some years ago. (Fortunately nothing was seriously broken, burning, etc., but there was a warning indication of some kind that the pilot wanted to have checked.) The view coming in to Keflavik, with whales swimming in the ocean below, was pretty cool.
- kps 6y agoLast I know of is https://en.wikipedia.org/wiki/Air_Transat_Flight_236 https://en.wikipedia.org/wiki/Air_Transat_Flight_236 running out of fuel.
- will_asouka 6y agoHappens fairly regularly but for passenger issues rather than technical- medical emergencies and disruptive passengers usually. Airlines have contracts with companies who provide a sat phone link to doctors who have the flight information and medical facilities at possible diversion airfields. Eg MedAire.
- sxcurry 6y agoYears ago I was on a 747 from SFO to LHR that landed in Iceland - oil pressure problem in an engine. A guy drove out with a pickup truck, climbed into the engine using a ladder in the back of the truck, and started hammering away. After a few hours in the terminal we got back on the plane and flew the rest of the way to LHR. I kept wondering just how qualified he was...
- 6y ago
- Tuxer 6y agoTransoceanic aircraft need lots of ETOPS time. For example the boeing 777 (twin-engine, transoceanic) has an ETOPS of 330 minutes, so it always needs to be 330 min away from an airport (which is 11 hours of flight from airport A to airport B, not taking wind into account)
- DeepYogurt 6y agoETOPS accounts for oceans. Please read the link.
- ghaff 6y agoThe "certain number of minutes" includes being over oceans. If you're too many minutes, you can't fly there. ("Minutes" are fairly large. I believe at least one Airbus aircraft is now at 4 hours.)
- tshaddox 6y agoGenerally transatlantic jetliners have more than 2 engines, although I suppose that’s beginning to change.
- rsynnott 6y agoThe vast majority of transatlantic airliners today are two engine aircraft. For four engines, you’re basically looking at 747s and maybe the odd a340 that has somehow escaped retirement. The last large four engine airliner will go out of production next year.
- ghaff 6y agoThat really hasn't been true since 747s started to be retired so it started to change years ago and 2-engine is now essentially the norm.
- NikolaeVarius 6y agoThis has not been true for a decade
- bonestamp2 6y agoYou stay close to land as much as possible. For example, LA to Tokyo, you basically fly up the west coast, give Canada's west coast a high five, and then come around below Alaska. It's less direct than it could be, but it's much safer in the event of an emergency.
- bluGill 6y agoIt is more.direct than it sounds though because the earth is round and so the shortest distance between two points curves.