Generic Klonopin yellow pill
Buy Ambien online cheap
Lorazepam with liver failure
Buy Phentermine kansas
Buy Ativan visa
Prescription Ambien alcohol
Buy Klonopin online overnight
Adipex without doctor
Buy Clonazepam india
Clonazepam prescription prices
Buy Phentermine pills
Ambien buy online no prescription
Valium 10mg no prescription needed
Ambien 5mg tablet side effects
Buy Soma 445ns
Buy Lorazepam online cheap
Cheap Ativan for sale
Buy Ativan from mexico
Ambien pills buy
Order Lorazepam cheap
Buy Ativan no prescription mastercard
Provigil canada pharmacy many
Ambien cr online
Canada pharmacies online Provigil
Generic Clonazepam wholesale
Ambien generic Ambien cr Ambien generic
Provigil rx com
Where to buy Ambien in mexico
Cheap Provigil
Buy Ambien without rx
Ambien prescription assistance
Order Phentermine weight loss
Clonazepam prescription
Lorazepam online pharmacy
Ambien road atherstone property for sale
Generic Ambien work well
Buy Clonazepam 2mg
Buy Lorazepam cash on delivery
Xanax xr generic name
Buy Provigil europe
Lorazepam with alcohol
Lorazepam with paroxetine
Order Adipex tablets
Ambien sale no prescription
Phentermine online free
Cost of generic Valium
Order Zolpidem cod saturday
Xanax online mexico
Ativan online no prescription
Buy Lorazepam tabs
Ambien buy usa
Ambien dosage 15 mg
Ambien online blogs
Provigil online canada
Lorazepam with a prescription
Zolpidem prescription walgreens
Provigil prescription buy
Generic Zolpidem tartrate
Lorazepam with amitriptyline
Lorazepam with alcohol side effects
What does Xanax 1 mg look like
Ativan prescription
Buy Clonazepam 1 mg
Buy Ativan drug
Mixing Lorazepam with alcohol
Buy Valium 5mg
Ativan prescription online
Clonazepam with muscle relaxer
Cheap Tramadol hcl
Buy Ativan forum
Buy Tramadol sr
Buy Xanax online nz
Ambien cr generic 12.5 mg
Buy Ativan no rx
Generic Xanax g3722
Order Soma mexico
Generic Ambien same
Lorazepam with advil
Valium 10mg value street
Buy Adipex p uk
Lorazepam with propranolol
Modafinil online generic
Cheap Valium sale uk
Buy Zolpidem now
Carisoprodol prescription
Soma sale
Purchase Phentermine weight loss
Order Soma tramadol
Lorazepam with pregnancy
Buy Ativan uk
Generic Lorazepam pills
Diazepam prescription online
Tramadol uk buy
Cheap Tramadol medication
Generic Provigil date
Buy Clonazepam no rx
Buy Valium steroids
Tramadol online 100mg
Order Ambien cheap online
Order Phentermine online mexico
Lorazepam prescription help
Ambien doses in mg
Generic Modafinil 2012
Order Tramadol line
Tramadol prescription only drug
Valium and seizure disorder
Buy Soma email
Buy Ativan without rx
Xanax online mastercard
Xanax do you need a prescription
Buy Ativan cod Ativan cod delivery
Klonopin prescription cost
Buy Ativan now
Cheap Ativan visa
Lorazepam online mastercard
Soma canada steel
Adipex online forum
Valium for anxiety disorder
Generic Clonazepam 2mg
Ambien apo 10mg
Provigil online canadian pharmacy
Order Soma mexico
Lorazepam rx 774
Ultram online purchase
Clonazepam with lorazepam
Ambien dosage 10 mg
Ativan sale canada
Cheap Ativan no prescription
Valium picture generic
Lorazepam with no prescription
Ambien and mg
Generic Ambien overnight delivery
Provigil online no prescription needed
Cheap Phentermine prescription
Ambien online purchase
Buy Lorazepam cod
Alprazolam online from canada
Buy Soma prescription
Ambien generic online no prescription
Buy diazepam alprazolam
How to buy Ambien name brand
Ambien sinus disorder
Lorazepam with ambien
Buy Provigil online cheap
Ambien prescription assistance
Generic Modafinil fda
Ativan canada drugs
Xanax 1mg pill id

Tracking down MH370 black boxes a Herculean challenge


Privacy Policy

Recovering the black boxes from the Malaysia Airlines jet that crashed into the southern Indian Ocean is a Herculean task, even with the wealth of sophisticated equipment being deployed.

Any hope of finding survivors from the missing plane was extinguished on Monday when Malaysia's prime minister announced satellite data showed MH370's journey had "ended in the southern Indian Ocean" off the west coast of Australia.

Seventeen days after the Boeing 777 disappeared, distraught relatives were forced to accept what they had long feared -- that the 239 passengers and crew on board were never coming home.

The plane's two black boxes are key to solving the mystery of why the plane veered so far off course and its final fate, but experts say that the search for them will be long and difficult.

In theory, the black boxes containing flight data and cockpit voice recordings will continue emitting tracking signals for about another two weeks, with an average audible range of two to three kilometres (nearly two miles).

But with no debris in the remote search area confirmed as linked to the plane, it is still a case of looking for a needle in a haystack.

"Picking up a signal from the beacon seems an outside chance," said a member of the team that hunted the black boxes from Air France flight AF447 that crashed in the Atlantic in 2009.

- Vast search zone -

The investigator, who asked to remain anonymous, noted that in the Air France case the signals were not heard at all. One transmitter had failed and the other had fallen off on impact and was never found, he said.

"So I'm fairly pessimistic about this approach," he said, recommending that the immediate priority should be to catalogue every piece of debris that is discovered.

"Then, ideally, data buoys should be deployed," he said. These instruments, commonly used for meteorological data, are tracked by satellite and give an idea of ocean currents in the area to help confirm mathematical models.

But he warned that the 17 days that have elapsed since the crash and the "uncertainty associated with these models will combine to make the search zone quite vast".

Commercial airliners are obliged to carry two black boxes -- the Digital Flight Data Recorder which logs the speed, altitude and direction, while the Cockpit Voice Recorder keeps track of cockpit conversations and other sounds and announcements.

Even before the official announcement that the plane had crashed, the US navy said it was flying a black box locator to Perth. The Pinger Locator, weighing 35 kilogrammes (80 pounds), is attached to a cable and towed by a ship.

It is equipped with a listening device that can detect the signals of a black box at a depth of up to 6,000 metres (20,000 feet).

- Scouring the sea floor -

If a signal is not picked up, the next stage would be to deploy lateral scanning sonars after determining the variations of the sea floor to pick up any anomalies.

All the experts who spoke to AFP believed the search operation could last a very long time -- months or more.

In the Air France crash it took 23 months to locate the main wreckage and retrieve the black boxes at a depth of 3,900 metres.

"An underwater phase to try to locate the plane from flight MH370 can only be started if the activity under way allows us to define a search zone more limited than the current search zone," France's air accident investigation bureau (BEA) said Monday.

Some of the wreckage that investigators were able to find less than two weeks after Air France flight AF447 went down over the Atlantic in June 2009

Once such a zone is set, if it is over a flat and sedimentary seabed, investigators can use "towed sonars and get a good coverage".

If, however, the zone is over a broken, irregular seabed, they could call in the Remus submarine drones used for the Air France search plane.

Remote operating vehicles (ROVs) could also be used in a later stage to check topographical anomalies with high-definition cameras.

"These remote-controlled robots, which have a cable linking them to the surface, move forward slowly and thus have a more reliable coverage," said the investigator, who was formerly with the BEA.

"But there as well, a very precise position is needed to use them at depth."

And even if the black boxes are found, there are no guarantees they will be in a state to give up their data.

The Malaysian authorities have said a deliberate act made MH370 disappear from civilian air control radars -- and the big question is whether the Cockpit Voice Recorder was immobilised.

"You only need to pull the breaker that is by the pilot's seat and it is taken off-line electrically," explained one aviation expert.

MH370's disappearance has prompted a major debate over inflight communications, including the benefits of live streaming black box data.


Facebook

Twitter

Google Plus

YouTube