Malaysia Airlines 777 missing

If the black box was sitting on the ocean floor pinging wouldn't it be stationary? So if you wanted to keep listening to the signal all you would have to do is not move? And if you lost the signal you could just go back to the last spot you heard it? The ULB broadcasts continuously not intermittently so it would be a constant signal right? That makes me think it probably wasn't the ULB.
 
thevideographer said:
If the black box was sitting on the ocean floor pinging wouldn't it be stationary? So if you wanted to keep listening to the signal all you would have to do is not move? And if you lost the signal you could just go back to the last spot you heard it? The ULB broadcasts continuously not intermittently so it would be a constant signal right? That makes me think it probably wasn't the ULB.
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Sound travels a LOOOONNNNG way in the water - much further than air. Plus, different conditions in the water can affect the distance. They may get a bearing on the sound, but have to move around and get several bearings and ranges to locate it. Think of walking around in the mall. You hear a song from the muzak on a speaker somewhere, but it's HARD to zero in on the particular source amid all the noise.

Deep water oceans are noisy places.
 
thevideographer said:
If the black box was sitting on the ocean floor pinging wouldn't it be stationary? So if you wanted to keep listening to the signal all you would have to do is not move? And if you lost the signal you could just go back to the last spot you heard it? The ULB broadcasts continuously not intermittently so it would be a constant signal right? That makes me think it probably wasn't the ULB.
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I think you are picturing a sailor with headphones on like in Hunt for Red October.

These signals were so weak that there would have always been a doubt. It took some digital processing to find a pattern in the noise.

They have accurate GPS mappings of their course and could not reestablish the pattern after changing and then reversing course. I'm not going to say find the ping as that suggests there was a ping.

I mentioned it before, when you filter and amplify a frequency you often get artifacts that are rhythmic in nature, usually from your own equipment. When you detect something at frequency a, it might be a harmonic of a source transmitting at frequency b.

I agree, I don't think they detected the ULB only to be witness of it running out of battery power.
 
killbilly said:
Sound travels a LOOOONNNNG way in the water - much further than air. Plus, different conditions in the water can affect the distance. They may get a bearing on the sound, but have to move around and get several bearings and ranges to locate it. Think of walking around in the mall. You hear a song from the muzak on a speaker somewhere, but it's HARD to zero in on the particular source amid all the noise.

Deep water oceans are noisy places.
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Also, oceans are not a homogenous medium. Thermoclines can reflect and refract sound waves.
 
I hate to be "that guy" but I honestly dont think they are going to find this plane for at least a year and I dont think what they are hearing is or was the ULB.
 
SeanD said:
I hate to be "that guy" but I honestly dont think they are going to find this plane for at least a year and I dont think what they are hearing is or was the ULB.
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I hate to be "that guy", but I don't think it is especially important that the plane ever be found and I don't think tremendous resources should be thrown at the effort after the maximum lifespan of the ULB batteries has been realized.

The 777 has a stellar safety record and I don't think many folks think this is a case of mechanical failure. So, what's left? Terrorism, crew-initiated murder-suicide, failed hijacking? Given these possibilities, Malaysia and Malaysia Airlines should look at their policies and procedures for these scenarios regardless of what actually happened.

As far as closure for the families, they aren't paying for it. Bad things happen, that's life.
 
Seggy said:
Guys and Gals.

They are going to find the airplane.
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  • (CNN) - [Breaking news update at 11:05 p.m. ET]


  • Ocean Shield has been able to reacquire the signals that are consistent with airplane locator beacons on two more occasions -- both on Tuesday, said Angus Houston, head of the Australian-led search effort on Wednesday.

    Ocean Shield has now detected four transmissions in the same broad area.

    "I believe we are searching in the right area," he said.

    [Last update posted at 9:56 p.m. ET ]

    Flight 370: Careful not to project 'false hope' as days go by since last pulses

    (CNN) -- By air and by sea, searches resumed Wednesday for evidence of Malaysia Airlines Flight 370 -- the latest focus stemming from underwater pulses, possibly from the plane, that have yet to pan out.

    Authorities haven't given up hope of finding something, nor have they discounted the possibility that the focus on the so-called pings may prove a fruitless lead, like so many others before it.

    "We need to maintain respectful optimism and be responsible," U.S. Navy Capt. Mark M. Matthews told CNN's Anderson Cooper from Australia. "Because we certainly do not want to project false hope."

    Hours earlier, Navy Cmdr. William Marks acknowledged that the lack of new signals since those detected Saturday aboard an Australian navy ship does make searchers "more cautious."

    CNN's Richard Quest, Ed Payne, Catherine Shoichet, Jethro Mullen, Matthew Chance, David Molko, Will Ripley, Judy Kwon, Ed Payne and Mitra Mobasherat and journalist Ivy Sam also contributed to this report.
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