General > General Technical Chat

CVR of crashed 737 Sriwijaya Air SJ182 recovered ... in pieces

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Ed.Kloonk:

--- Quote from: Halcyon on January 24, 2021, 11:25:00 pm ---I'm surprised they haven't invented a better mechanism for recovery of recorders. Maybe have a secondary backup recorded that jettisons itself right before or the moment of impact, then it can just be fished out of the water or whatever. At least that way you have a lot of the valuable data, even if you miss the last few seconds, I think by that stage, the data is less important anyway.

--- End quote ---

As someone who hangs around aviators and is a plane nerd, we see this all the time. I've seen sketches that depict aircraft with essentially ejector seats, whole detachable in-flight fuselages with parachutes, etc.

The problem is that is complicates things and doesn't solve the sinister root cause. If someone onboard has it in for the aircraft and it's souls...

The thing about transponders is the destructive party finds a way to disable the device.

pickle9000:
There is talk of making a duplicate of the information and storing it on the outside of the aircraft and allowing it to be knocked off in a crash. It would have a gps and the ability to float. The purpose would be to locate the aircraft / survivors and have a backup or the boxes.

james_s:

--- Quote from: amyk on January 25, 2021, 12:01:20 am ---...and considering that it is located in the tail, which is the last part to hit anything, I suppose everything in the nose ends up looking like it went through the Hydraulic Press Channel... :o

--- End quote ---

At the speeds catastrophic crashes occur at, the fuselage and most of its contents essentially shatters into tiny fragments. It tends to stir up the conspiracy theorists who lack a sufficient understanding of physics to understand why they don't see recognizable aircraft wreckage after a nose in crash. The only parts that tend to survive those crashes relatively intact are the really solid heavy stuff like landing gear struts and the shafts from the engine cores, and hopefully the recorders. 

tooki:

--- Quote from: Halcyon on January 24, 2021, 11:25:00 pm ---I'm surprised they haven't invented a better mechanism for recovery of recorders. Maybe have a secondary backup recorded that jettisons itself right before or the moment of impact, then it can just be fished out of the water or whatever. At least that way you have a lot of the valuable data, even if you miss the last few seconds, I think by that stage, the data is less important anyway.

--- End quote ---
In fact, this has been considered for commercial aircraft for a long time, and apparently has been standard equipment in US Air Force aircraft since 1993, so it’s a proven technology. It’s just not cheap.


--- Quote from: james_s on January 24, 2021, 11:49:20 pm ---I think it would be very difficult to detect the proper moment to jettison, and the recorder would still be traveling at the same speed as the aircraft so it might not do much good. It would pop out and smash into the earth at the same speed without the possible benefit of the fuselage absorbing some of the impact.

--- End quote ---
Evidently not a problem, since the military has been using this technology for decades.

fcb:
FDR/CVR survival will increasingly be irrelevant.  Old planes with old FDR/CVR will get rotated out of the fleet far quicker than improvements will be mandated.

Alot of planes now lease turbofan engines and pay for "Power-By-The-Hour", this is enabled by pretty sophisticated real-time data beamed to satellites. Data costs tend towards zero - the amount of data collected in realtime will easily exceed that stored by standard black-boxes.  You could see a point where crash investigation results and subsequent groundings could occur within seconds of a crash. Juan Browne will be able to release videos within minutes.

Presumably airlines/manufacturers will use this data to further reduce maintainence hours and costs without compromising safety. :scared:

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