|Quoting laxboeingman (Reply 30):|
What is the likelihood that anyone survived the impact, if the plane - at least the cabin - stayed intact? Eventually, though, they would run out of oxygen, which could kill them if they are not found.
|Quoting laxboeingman (Reply 22):|
plane may be intact, but resting at the bottom of the ocean. I know that sounds crazy. If that were the case, however, how long would it take for water to engulf the cabin?
Once a plane sinks it will more or less rapidly fill with water. An airliner is not a submarine.
Not certain how long until the plane fills but I'm pretty sure oax would drown before they succumbed to CO2 poisoning. An hour tops? This would also depend on the pilots preparing the plane for ditching by closing all the valves.
|Quoting nupogodi (Reply 24):|
It's my understanding that aircraft have pressurized canisters on the emergency exits that, when "armed", force the door open and inflate the slide.
They are power assisted when armed but not sure of the gas canister opens the door. I think that may be electrical. Turn the handle and the door opens. The slide is then inflated with a compressed gas cartridge (CO2?). In any case same function in practice.
|Quoting samair (Reply 4):|
I don't understand why the authorities are still looking for wreckage, they are assuming that the aircraft has broken up (it's never good to assume anything). Based on previous 2 major 777 crashes where the fuselage has remained almost intact. Could it be possible that with a very experienced pilot the aircraft has had a very successful landing but unfortunately sank before people could evacuate?
In search and rescue, you pretty much look until you find the plane.
You're basing an assumption on intact impact. We can't do that.
If a ditching was successful, no way at least some people didn't get into rafts.
|Quoting nupogodi (Reply 18):|
Quoting rc135x (Reply 14):
Does the 777 autopilot have an "auto level off" function, where the cruise altitude is set during climb and the airplane will automatically level off without pilot intervention?
Never flown anything that big, but my understanding is that it is a standard feature on autopilots. You set a maximum climb rate and you set a target altitude and away you go.
Yes such a function exists. More likely, the autoflight system was in VNAV mode, with a defined vertical flight path following waypoints in the FMC.
|Quoting aftgaffe (Reply 29):|
1) Assuming the pilots were not incapacitated (e.g. hypoxia), there has to be a amount of time (e.g. 20 minutes) after a serious event by which point it is a near certainty that the pilots will have tried to contact ATC / declare an emergency. In other words, we all understand aviate, navigate, communicate... but the chances that a serious event occurs and the pilots proceed to aviate for, say, 20 minutes without attempting any communication seems vanishingly small. Granted everything we are hypothesizing has a vanishingly small chance of happening, but is that a reasonable premise?
If you started a search for every plane is 20 minutes late checking in, there'd be a lot of searches.
There are well defined procedures for contact loss and in most cases contact loss means something pretty mundane has happened. I've been out of contact simply because the radio in that particular plane was not the best and combined with atmospheric conditions this prevented me from contacting the next station until I was closer, which took about 10 minutes. No big deal for them or me.
My point is that if contact is lost for even 20 minutes in a sparsely populated area, in most cases it is perhaps a minor equipment problem or something as silly as the pilots switching to the wrong frequency and not noticing for a bit (been there, done that). ATC will try to call, and if they can't get an answer, will call on guard frequency and/or ask other aircraft to relay. Eventually you get hold of whoever and the pilots say "oops, sorry about that" and feel a bit sheepish.
Having said all that, the fact that transponder/ADS
-B stopped in an area with good coverage should raise some alerts. And it probably did, at least in so much as, "huh, that guy dropped off the screen. Let me keep an eye on that and see what happens."
|Quoting aftgaffe (Reply 29):|
2) Any failure that would result in a failure of the transponder and a failure of all communication abilities would be catastrophic. The longest a plane could stay aloft after that would be its glide time. At FL 350 at cruise speed, I have read this would be about 20 minutes. Give or take.
There are possible scenarios where you lose comms and still have engines. Unlikely ones, granted. What if you had an electrical fire in the radio panel? Or, and this is of course way out there, a meteor strike damaging all the antennas.
|Quoting tyler81190 (Reply 43):|
If the reports of the cell phones ringing are true, and I will try to find the article in a moment, that means a few things:
1. the phones are on
2. they are un-damaged
3. they are holding a charge
4. they have some kind of connectivity
AFAIK, all of these cell phone rumors have been false after officials have tried the phones.
Now it may be possible they are ringing, but more likely these stories about phones are because families will make themselves believe anything to keep hope alive. I would.
|Quoting Stabilator (Reply 51):|
Even if the plane was experiencing a catastrophic event, either the F/O or Captain would certainly make a distress call. In all my years of g/a training, there has never been an example so severe that it would require me to not send out an emergency signal. Changing the squak to general emergency doesn't take long at all. And while one pilot has "controls" the other pilot/s in the flight deck are usually handling things like emergency checks and radio calls.
AF447 never made a distress call. Yes, changing the transponder code or calling does not take long, but sometimes the crew is immersed in a problem.
|Quoting penguins (Reply 55):|
How have the authorities ruled out that the plane did not make it to land? What if we are searching in the wrong places?
I don't think they have ruled that out.
|Quoting tyler81190 (Reply 59):|
With AF447, everyone knew something major had happened due to the messages that were auto-sent to AF. With this one it seems to have just disappeared off the face of the planet with no wreckage after 3 days. Not one piece.
The major difference is that AF447 had automated ACARS reporting for maintenance, while MH370 seemingly did not. If AF447 hadn't had ACARS reporting, it too would have vanished like this.
|Quoting Web500sjc (Reply 91):|
Quoting flyKiWi (Reply 85):
if this was a hijacking,
If this was a hijack, in this day of age, there most defiantly would have been a mayday or help call over the radio.
It wasn't a hijack.
Too many assumptions. For example, what if the flight crew were the hijackers?
[Edited 2014-03-10 17:16:10]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo