Malaysian Airlines MH370 contact lost
Join Date: Apr 2014
Location: Spain
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
It might just be coincidental but HMS Astute left Gibraltar early last week en-route the Suez canal. It is the first boat of the class replacing the T class sub force. It has the 2076 sonar plus more.
Join Date: Mar 2010
Location: London
Age: 51
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Twitter
JTwitter ID James Chau @jameschau
#exclusive My source: 37.5 kHz bang on, BUT indicates signal detected 4 only 15 mins. If #MH370 why nt longer? #breaking
@jameschau his colleague is aboard the ship who reported the pings.
#exclusive My source: 37.5 kHz bang on, BUT indicates signal detected 4 only 15 mins. If #MH370 why nt longer? #breaking
@jameschau his colleague is aboard the ship who reported the pings.
Join Date: Apr 2009
Location: Melbourne
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Ahhhhmmmmmm
If you were on a boat searching for pings on 37.5 and you started receiving them, maybe you would think about...
STOPPING THE BOAT
Is there something with to do with thermal layers that could stop signals from reaching the surface or whatever depth they were towing their sonar array at?
Why would they only receive the ping signal for 15 mins, a month after the plane went down?
Something is not right here. It doesn't make sense to me.
If you were on a boat searching for pings on 37.5 and you started receiving them, maybe you would think about...
STOPPING THE BOAT
Is there something with to do with thermal layers that could stop signals from reaching the surface or whatever depth they were towing their sonar array at?
Why would they only receive the ping signal for 15 mins, a month after the plane went down?
Something is not right here. It doesn't make sense to me.
Join Date: Aug 2008
Location: With the fairies!
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Lompasso
37.5 is a frequency that was deliberately chosen because there is very little naturally occurring sources in the ocean anywhere near that frequency.
As for other ships accidentally generating that frequency - it is extremely unlikely.
xman80
What do you think happens when you stop towing a weight behind a ship? No wonder it doesn't make sense to you.
Is there anything else that might have generated the signal?
As for other ships accidentally generating that frequency - it is extremely unlikely.
xman80
What do you think happens when you stop towing a weight behind a ship? No wonder it doesn't make sense to you.
Join Date: Jan 2008
Location: UK
Age: 88
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Underwater Mountains
And why did the signal last 90s?
Join Date: Feb 2008
Location: Subterranea
Age: 70
Posts: 187
Likes: 0
Received 0 Likes
on
0 Posts
ULB Battery Due Date
Just on CNN:
The MAS CEO declared during a press conference that the FDR / CVR - ULB maintenance records indicate that the ULB battery due date is June 2014.
That would imply that these batteries should have been replaced during scheduled maintenance in an A-check at around this time or in the next month or so if the aircraft was still in service to avoid the battery expiring between scheduled maintenance intervals.
The MAS CEO declared during a press conference that the FDR / CVR - ULB maintenance records indicate that the ULB battery due date is June 2014.
That would imply that these batteries should have been replaced during scheduled maintenance in an A-check at around this time or in the next month or so if the aircraft was still in service to avoid the battery expiring between scheduled maintenance intervals.
Join Date: Apr 2009
Location: Melbourne
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Reporter onboard says they first detected the signals as late as friday
And this Chinese ship is apparently way outside the international joint "co-ordinated" search area.
There's a serious solo run going on here.
Join Date: Jan 2007
Location: Relocating at present.
Age: 63
Posts: 115
Received 0 Likes
on
0 Posts
rog747;
Surely time to send in a P3 to drop some sonobuoys?
Also;
Perhaps time to calculate the drift current and dispatch an aircraft to hi-res image potential shore line for debris?
Time to get the Royal Navy up there quick with our sub HMS Tireless to confirm the pulse signal?
Also;
If the MAS flight MH370 Boeing 777 had crashed in that region then any floating small wreckage will be soon reaching the shores of Western Australia due the prevailing weather and sea conditions
According to CNN "expert", if the Chinese ship is towing the array at the surface and the wreckage is at the bottom there is no way it could hear the pinger. 4400 m depth.....plus no contact with Malaysia or AUS since the original report???? Something is not adding up....
Join Date: Jan 2002
Location: Germany (SLF)
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
the common sense thing to do is run back along the track with the microphone much lower in the water.
Join Date: Jan 2008
Location: uk
Age: 68
Posts: 29
Likes: 0
Received 0 Likes
on
0 Posts
methodology of towed search
It has been asked why not stop? The answer is that, aside from the practical considerations of a tow, a stationary detector provides no useful information. The 90 sec interval gives an idea of the wreckage being on a line perpendicular to the tow route corresponding to the middle of the 90 sec interval.
The technique would be to circle wide through 270 degrees and survey along the line just mentioned to hopefully detect over an interval thus producing another line. Approach this crossing point from a third direction between the other two to create a third line. The result of the three lines is known as a cocked hat and gives an idea of the position of the source. If the signal strength is measurably variable then the maximum strength gives a position for the perpendicular line.
The signals can be distorted by sea bed features and thermal/ salinity features in the water column.
The technique would be to circle wide through 270 degrees and survey along the line just mentioned to hopefully detect over an interval thus producing another line. Approach this crossing point from a third direction between the other two to create a third line. The result of the three lines is known as a cocked hat and gives an idea of the position of the source. If the signal strength is measurably variable then the maximum strength gives a position for the perpendicular line.
The signals can be distorted by sea bed features and thermal/ salinity features in the water column.
Props are for boats!
Join Date: Oct 2000
Location: An Asian Hub
Age: 56
Posts: 994
Likes: 0
Received 0 Likes
on
0 Posts
Just watching that CCTV You tube link.
She said that the ship detected the same signal on Friday for 15 minutes but were unsure because there were other ships in the vicinity. Then they heard it at 4:00pm Beijing time today for just 90s. Now if they didn't record today. Did they record it yesterday? Something is a miss here. I'm afraid there seems to be no reports of this on Friday. I smell a sensationalist media release like their sat photos last month turned out to be. Was that XINHUA as well?
She said that the ship detected the same signal on Friday for 15 minutes but were unsure because there were other ships in the vicinity. Then they heard it at 4:00pm Beijing time today for just 90s. Now if they didn't record today. Did they record it yesterday? Something is a miss here. I'm afraid there seems to be no reports of this on Friday. I smell a sensationalist media release like their sat photos last month turned out to be. Was that XINHUA as well?
Join Date: Mar 2014
Location: Canada
Posts: 59
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by XB70_Valkyrie
Astounding this goes from the Chinese-> media instead of to the search team.
The reporter states that China and Australia authorities had been notified.
No surprise Malaysia is quiet, Australia is supervising this.
Originally Posted by PortVale
Chinese press on board the vessel
Western media reps have been present on numerous flights.
Join Date: Jul 2002
Location: Ireland
Posts: 596
Likes: 0
Received 0 Likes
on
0 Posts
If this vessel is ploughing its own furrow miles away from the main search sites, I'd say it was highly unlikely they would be detecting a 'test tone' from another ship.
I would also like to think that anyone generating 37.5KHz anywhere near other search vessels, would let everyone know when and for how long they were doing it.
I would also like to think that anyone generating 37.5KHz anywhere near other search vessels, would let everyone know when and for how long they were doing it.
xman80
What do you think happens when you stop towing a weight behind a ship? No wonder it doesn't make sense to you.
What do you think happens when you stop towing a weight behind a ship? No wonder it doesn't make sense to you.
sorry Pontius Navigator
devices are made in differing types and can descend below the surface or some types stay on the surface
both can set to listen at different depths etc etc
so a 4000m cable you suggest ? - of course a surface sonar would not hear it
also re wreckage the OP was responding to my original post where i stated
If the MH370 had crashed in that region then any floating small wreckage will be soon reaching the shores of Western Australia due the prevailing weather and sea conditions
seems you may not been reading the whole thread either
devices are made in differing types and can descend below the surface or some types stay on the surface
both can set to listen at different depths etc etc
so a 4000m cable you suggest ? - of course a surface sonar would not hear it
also re wreckage the OP was responding to my original post where i stated
If the MH370 had crashed in that region then any floating small wreckage will be soon reaching the shores of Western Australia due the prevailing weather and sea conditions
seems you may not been reading the whole thread either
Last edited by rog747; 5th Apr 2014 at 16:47.