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Originally Posted by shivshanker @Jeroen, people are smelling fish here, not sure if it is purely to malign the government, but from day 1 the story line is not making sense. for instance;
7. MOST IMP : MH has a safety rating of 7/8 and yet not yet implemented ACARS, why.? ACARS is very important for the MRO functions of the Aircraft especially at the RAMP
Nothing seems to be coming together. |
I would agree with your last statement, but that still doesn't mean there is a logical reason. I just don't understand why people jump to conclussions when so much is unknown, unconfirmed, unreliable. That in itself is reason for concern, because if anyting it probably shows lack of overall coordination, but even so. But I guess there are many instances in which people did not understand what was happening and jumped to conclussion, resulting in anything from conspiracy theories to witch hunts.
MH does have ACAR implemented. They just don't broadcast whilst in flight. So when the plane lands and is on the ground, they take a dump from ACARS and process the data on the ground. I'm not sure if there is any (known) correlation between broadcasting ACARS data and a safety rating.
If the plane had met with a catastrophic event (e.g. bomb or starting falling to piece for other reason) it can not be guaranteed that ACARS would be transmitting that data. It depends on how ACARS is set up. Even so, ACARS doesnt transmit continuously (its would get expensive for one thing). So it transmits in certain time intervals or when it gets triggered by certain events. (E.g. as in the unfortunate AF incident). So if events unfold quickly, it's doubtfull what you would be able to get out on a ACARS broadcast.
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Originally Posted by Recompose Pardon my ignorance, why cant GPS on the plane/passengers' smartphones used to locate them? I believe there are agencies which can track locations even if the phone is switched off. |
GPS in your smartphones are only receivers. They dont transmit and neither does for instance a GPS handheld device. The GPS signal by itself is extremely weak, often compared to radio noise. So if underwater, assuming, the smartphone is still working the GPS is unlikely to pick up any GPS signals. Water, unfortunately has a huge attenuating effect on radio frequencies. The higher the frequency the more. That's why submarines to date trail antenna's many hundreds of meters long to pick up and transmit LF radio traffic.
Essentially the same is true for all cell phones. Under water they won't work.
Now there are all sort of stories on the web about being able to track locations of cell phones that are switched off. Maybe the CIA or NSA or the likes of them have a technology that can circumnavigate basic electrical principles this is unlikely. What is true, is that when you switch off your cell phone, it could be possible to trace you to that particular position. With what accuracy remains to be seen and depends a number of variables. But that is all based on the premise that the mobile network knows where you were in the first place. If you move away from that position, with your phone switched off, nobody will be the wiser.
When you board a plane and leave your phone on, as many of you will be able to attest it will work fine initially inside the plane. However, once you've taken off you will loose coverage and the mobile network will have lost you. Once you would get into range of a mobile network your phone would attache itself again. Might take a while as many of us have probably experienced. But in order for a third party to figure out where you are, they would need to know your mobile number and they would need to know in which Mobile Network your phone has re-attached.
To what extent Mobile Network and their operators/carriers offer or able to provide location support depends a lot on the carrier, technology, vendor of the Network equipment, local legislation etc.
So, underwater neither GPS or a Phone is likely to work in terms of being abl to receive and or transmit a signal. Under water, for other, obvious reasons, it is not ver likely smart phones would work for very long either.
If the plane is on the ground, and a smart phone has survived, is switched on, and has coverage and is set up to roam onto that Network, in theory you would be able to trace it and maybe get a location. You would need to know which phone to look for in which network to look for and take it from there.
Jeroen