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originally posted by: Arbitrageur
a reply to: Imagewerx
Yes you're right about the acoustic locators for the cockpit voice recorder and flight data recorder "black boxes", that they're acoustic only and don't identify the aircraft as far as I can tell.
But I was hoping some aviation expert would chime in about the emergency locators which are not acoustic but as you suggest electromagnetic. I think the US has regulations that the life raft has to be equipped with such a device, (which may be capable of identifying which aircraft the raft is from, I don't know), but I really haven't found much about them outside of that requirement.
originally posted by: Arbitrageur
a reply to: Nochzwei
I guess what I'm wondering is how many ELTs were on MH370, and where?
One on the raft?
Is there another one besides that one and if so where is it located and how is it deployed?
There are two approved ELT providers for the B-777, Honeywell and ACR, both of which have cockpit control panels and interface with the master caution system. The ELT transmitter, with internal battery, is mounted inside the fuselage skin, above the aft cabin doors and is connected to an external antenna mounted very close above the ELT.
Second item, an earlier (deleted) post mentioned MAS avionics shop. To my knowledge their shop in KL does not have the knowledge, skills or approvals to do any work on the Honeywell AIMS cabinet modules nor the ADIRU.
Third item, The CVR/FDR are mounted in hard trays, attached to major airframe structure in the tail of the aircraft. Not accessible in flight, and not likely to be dislodged from the structure during a crash. Also please remember that there is a QAR module in the avionics package that might be readable when found.
A quick access recorder (QAR) is an airborne flight data recorder designed to provide quick and easy access to raw flight data, through means such as USB or cellular network connections and/or the use of standard flash memory cards. QARs are typically used by airlines to improve flight safety and operational efficiency, usually in the scope of an their flight operational quality assurance plans. Like the aircraft's flight data recorder (FDR), a QAR receives its inputs from the Flight Data Acquisition Unit (FDAU), recording over 2000 flight parameters. The QAR is also able to sample data at much higher rates than the FDR and, in some cases, for longer periods of time. Unlike the FDR, the QAR usually is not required by a national Civil Aviation Authority on commercial flights and is not designed to survive an accident. Despite this, some QARs have survived accidents and provided valuable information beyond that was recorded by the FDR.
Given that the Nuclear test ban treaty people said that their hydrophones at Cape Leeuwin did not detect MH370 impacting the ocean, it may place more weight on a controlled ditching.
This can detect icebergs falling in Antarctica, so if the plane struck the ocean with high force, it should have being able to detect the acoustic waves.
I think that's a big "if" with only one source so far I've seen mentioned it which also seemed to have other less than reliable information so I'm not sure I trust the source, plus it certainly would seem to conflict with Inmarsat's assessment of the plane continuing to fly for a long time and distance from where Vietnam would have picked up on that ELT signal.
originally posted by: qmantoo
So what happened about the ELT picked up by Vietnam - if indeed it was picked up by them?
it certainly would seem to conflict with Inmarsat's assessment of the plane continuing to fly for a long time
VN Express, Vietnam’s largest news site, reports that Vietnam Emergency Rescue Center just announced it has found signal of the missing plane at 9.50am 120 miles South West of Ca Mau cape, the Southern-most point of Vietnam.
The signal is believed to be the ELT (Emergency Locator Transmittor) , which can be activated manually by the flight crew or automatically upon impact.
Assuming that the device was working correctly, the crash could have broken the antenna or cut the connection with the ELT, rendering it useless.
Another possibility, experts say, is that the aircraft could have sunk before the ELT began transmitting. It takes 50 seconds for the ELT to establish the necessary connection. It only takes one half-second data "burst" to indicate there is an emergency. But it can take a half-dozen bursts -- at the rate of one every 50 seconds -- to provide information that will allow Cospas-Sarsat to triangulate the beacon's position.
"In this case, there wasn't even one burst, according to the reports that we received," Lett said.
But the ELT of greatest interest is the remaining "fixed" ELT, mounted to the aircraft frame. The fixed ELT -- a Honeywell RESCU 406 AFN -- was positioned near the rear door and connected to an antenna on top of the aircraft. It could be activated, either manually by a pilot in the cockpit, or automatically upon impact, by an inertial "G-switch."
The RESCU 406 AFN was designed "to provide emergency transmission for aircraft flying over land," according to Honeywell's published specifications.
"They are not mandated or designed to work under water," a Honeywell spokesman told CNN. But experts say any impact -- whether on land or at sea -- likely would have activated the transmitter.
Once activated, the device simultaneously transmits "bursts" -- short, digitally coded signals -- on three frequencies. Two of the frequencies -- 243 MHz and 121.5 MHz -- are VHF frequencies and can help search planes hone in on a target. The third frequency is 406 MHz.
Twenty of the passengers aboard the flight work with Freescale Semiconductor, a company based in Austin, Texas. The company said that 12 of the employees are from Malaysia and eight are from China.
“Echolocation signals in all toothed whales is generated in sequences of multiple clicks, and the time interval between these clicks is highly variable," Castellote said. "A sequence of pings at 37.5 kHz with a constant interval of one second would be extremely easy to distinguish from echolocation by just looking at the temporal distribution of the ping,” Castellote said.
Brecken, of Honeywell, said it is not known whether the acoustic beacons would change their frequency characteristics as their batteries run out after end of the federally-mandated 30-day period. As of Monday, the plane has been missing for 31 days, which means the batteries could run out at any time now.
A pilot from New York believes he has found the wreckage of the missing Malaysia Airline Flight 370 off the coast of Thailand after searching thousands of satellite images online. Michael Hoebel, 60, spent hours trawling through the images made available to the public on a crowd-sourcing website, TomNod.com, before coming across what he believes is the doomed plane. The recreational pilot from Tonawanda said he was shocked to discover that the aircraft, which vanished two months ago, appeared to be in one piece beneath the water off the northeast coast of Malaysia, just west of Songkhla in Thailand. The image was taken days after the crash.
The Gulf of Thailand is relatively shallow: its mean depth is 45 m (148 ft) and the maximum depth is only 80 m (260 ft).
CANBERRA, April 28 (Xinhua) -- The new technology of towed side- sonar device will be deployed in four weeks, Angus Houston, chief coordinator of the Joint Agency Coordination Center (JACC) for the search of Malaysian Airline flight MH370, said here Monday.
At a press conference held in the Chinese Embassy in Australia, Houston said the towed side-sonar search would be conducted by possible private underwater search and recovery companies.
The device will work just above ocean floor, exactly as the Bluefin-21 Autonomous Underwater Vehicle does, to get maximum value from side-looking sonar.
KUALA LUMPUR, April 29 (Xinhua) -- Malaysian acting Transport Minister Hishammuddin Hussein said here Tuesday in a statement that the credibility of a report citing the detection of potential aircraft wreckage in the Bay of Bengal would be assessed.
A marine exploration company based in Australia had said it might have found the wreckage site of the missing Malaysian flight MH370 in the Bay of Bengal, some 5,000 km north of the current search area for the plane, which vanished on March 8 with 239 aboard.