CVR is found.
BREAKING NEWS: CVR Black Box Sriwijaya Air SJ 182 Ditemukan (kompas.com)
Indonesia recovers cockpit voice recorder of crashed Sriwijaya Air jet (yahoo.com)

Fantastic news

Very good news indeed, but let's wait to see if it can be exploited...
In any case congrats to the salvage team !

Fantastic search team, respect.

That's absolutely brilliant, well done to every one involved.

I was certain it was gone for good.

737-500 missing in Indonesia
 

Just a thought but but why not have duplicate CVR’s and FDR’s on aircraft in different locations?

Good idea Brian. Better than impractical idea of broadcasting it for ground storage.

More expensive , perhaps, but not impractical.

Kudos to the diving team working in those awful conditions and probably finding non airframe pieces too.

ktcanuck

"More expensive, perhaps, but not impractical."

Or, if all else fails, just attach the ULBs more securely to the memory modules ...

Still all-eggs-in-one-basket rather than redundancy - but multiple would carry weight penalties and temptation of making them less crash-survivable and risking all of them not surviving, tradeoff as always.

But with what you say, is there a reason the ULBs have to be separate and "attached" (or detachable...), why not integrated?

I have vague idea this may be to do with ULBs having to be regularly replaced as the batteries die, but these days with solid state memory and near-field wireless power and data interfaces is it now possible to do ULB / CSMU in a single easily replaceable module?

How would you suggest to trigger an integrated ULB? As the current models are set off by immersion into water, that would not work quite well if encased.

Great news - as above I'm sure its been a very tough job. Physically unpleasant .

There's a tendency to slag off the Indonesians on here but they really stuck to this task

Ref post 728. When you see what Airlines are doing to save money / weight / fuel costs I cannot see them duplicating anything.

https://www.aerotime.aero/23619-17-t...irlines-change

Modern FDR’s and CVR’s monitor so many things the How it happened & What caused it can now more easily be found. Until such times as Cockpit Video Recorders are installed the Why can sometimes only be conjecture.

Why is that impractical?

Data rates these days are far in excess of what is required, and storage costs absolute peanuts.

Not only could it be used for accident investigation but in these days of big data crunching with machine learning and artificial intelligence, that data could be used for failure prediction. That sort of technology is already used in other operational technologies. In the long run it could pay for itself if predictive maintenance prevents "unplanned events".

And imagine if all of those sequences of events that lead to aircraft loss are combined and analyzed, and pilots could be warned that a seemingly harmless alarm taken in context of other data indicated that a catastrophic failure was in the offing?

Added: And automatically gave him a solution?

https://analyticsindiamag.com/how-to...-data-science/

The idea of storing CVR and FDR data outside the aircraft has been researched and discussed by all the major international aviation agencies in the recent past (especially ICAO, of course). The notion gained momemtum because of AF447 (recorders eventually located and retrieved) then again because of MH370. Of course the idea has benefits but it also has some significant hurdles.

Pretty likely that they are attached feebly by intent in order to protect the memory module. Musk's Starlink will make it all moot soon anyway. There will be thousands of satellites (about 1,500 today?) in low earth orbit serving as communications satellites. Price today is £500 setup + £100 a month for unlimited data.

At present only fixed base stations are supported but that is changing. Not freely available I don't think, still under some sort of test regime with limited coverage.

The commoditization of beam steering, flat plate, phased array antennas may turn out to be Elon Musk's greatest legacy. You probably didn't know you wanted one.

There was someone on another forum they other day who said something like - well it's like a moveable dish but it doesn't move, but I can't say any more 'cos its a military secret. You can now buy them for £500.:)

https://en.wikipedia.org/wiki/Starlink

It's been discussed to have the CVR and the FDR 'mirror' each other - i.e. have both record the same data. As memory has gotten smaller and cheaper, it's now practical.
It would require some up-front expenditures to add the capabilities, and some wiring changes to the aircraft, but it's certainly 'doable'...

The biggest drawback to 'real time' data download is recurring costs - the satellite band width doesn't come cheap.

Realbabilu, thank you for posting the announcement about discovery of the CSMU.

A hearty "Atta boy" to the KNKT and everyone on Team Indonesia! The difficult took a few days, the impossible took a little longer.

Here is a close-up of the CSMU shortly after it was located, from video accompanying this Kompas article:

KNKT: CVR Sriwijaya SJ 182 Found After One and a Half Months of Searching
Author Sania Mashabi | Editor Diamanty Meiliana
Kompas.com - 03/31/2021, 13:04

https://cimg2.ibsrv.net/gimg/pprune....b43d965599.png

Reports indicate that the CSMU was found by employing the services of the "King Arthur 8", a class of vessel known as a "Trailing Sucker Hopper Dredge" or TSHD. Here is an image of the ship

Talk about using a huge cannon to swat a fly !! That is in no way a criticism, just an observation about the SCALE of the vessel, relative to the approximately 100mm tall by 100mm OD dimensions of the CSMU.

To get some idea, watch the following YT video:

"Dredging: Trailing Suction Hopper Dredgers - How does it work?"

Considering the large volume of material a TSHD vessel is designed to rapidly process, it is hard to imagine how searchers pored through the contents deposited in the ship's hold.

I doubt there was much that could be done to throttle back the rate of collection fro the seabed - there must be a minimum suction required for effective transport up the pipes. Placing screens over the outlets seems improbable because of the frequency of blockage by crash debris and other solid material.

Perhaps industrial sized mesh strainers were suspended in the hold below the outlets of the pipes.

Even something crude like dumpsters with numerous holes smaller than 100mm x 100mm torched into the sides for drainage would have sufficed.

Whatever they did, congratulations to them ..