Singapore Expats Forum
https://www.singaporeexpats.com/forum/
https://www.singaporeexpats.com/forum/viewtopic.php?t=100716
!!!Max Headroom wrote:As I understand it, both black boxes are overwritten every 30 minutes, so even if they did find them, the CVR would have nothing but 30 minutes of white noise and the FDR would show all parameters pretty much flat-lining eh.
It's much longer than 30 mins.... more like 30 hours now with modern boxes.Max Headroom wrote:As I understand it, both black boxes are overwritten every 30 minutes, so even if they did find them, the CVR would have nothing but 30 minutes of white noise and the FDR would show all parameters pretty much flat-lining eh.
And that's if they find them.
I think, now more than ever, a case can be made for uploading all black box data real-time, rather than keeping it in a metal box that you then have to go and find, bring up and parse; well, the bits that haven't been crushed, burned or water-logged.
I'm sure uploading is expensive, but so is endless needle-in-a-hay-stack sniffing around for a few metal boxes in a god-forsaken and ever-stormy ocean.
if you know a bit on how all things flying work, to certify and all will cost a load of money. then the 10$ will become 100k per planeearthfriendly wrote:the industry to do because it significantly adds to safety," he said. Other satellite providers are also developing tracking systems.
FDR is longer 24 hour or so I thinkPNGMK wrote:
It's much longer than 30 mins.... more like 30 hours now with modern boxes.
Which is still moot, no?PNGMK wrote:It's much longer than 30 mins.... more like 30 hours now with modern boxes.Max Headroom wrote:As I understand it, both black boxes are overwritten every 30 minutes, so even if they did find them, the CVR would have nothing but 30 minutes of white noise and the FDR would show all parameters pretty much flat-lining eh.
And that's if they find them.
I think, now more than ever, a case can be made for uploading all black box data real-time, rather than keeping it in a metal box that you then have to go and find, bring up and parse; well, the bits that haven't been crushed, burned or water-logged.
I'm sure uploading is expensive, but so is endless needle-in-a-hay-stack sniffing around for a few metal boxes in a god-forsaken and ever-stormy ocean.
google FLIGHT DATA RECORDER and COCKPIT VOICE RECORDERthe lynx wrote:
I tried Googling about the black box rewriting itself but can't find. Can anyone point me to the right direction?
yeah I posted that here on last Monday 17th, back on page 9........ I also thought it seemed a significant point and was surprised it hadn't been highlighted earlier, or even much since then !sundaymorningstaple wrote:I had heard early on that the pilot's wife and children left the family home the day before the ill-fated flight. It would seem that the family breakup may well have plausibility as to what happened............
http://www.nzherald.co.nz/air-accidents ... d=11226334
Thanks. Found it.ecureilx wrote:google FLIGHT DATA RECORDER and COCKPIT VOICE RECORDERthe lynx wrote:
I tried Googling about the black box rewriting itself but can't find. Can anyone point me to the right direction?
The Cockpit Sound Recorder (CSR) provided a progressive erasing/recording loop (lasting 30 or more minutes) of all sounds (explosion, voice, and the noise of any aircraft structural components undergoing serious fracture and breakage) which could be overheard in the cockpit and was an analog device as described by Boniface in his patent.
Most FDRs record approximately 17–25 hours worth of data in a continuous loop (citation needed).
Yeah as one US source asked; why are they protecting the person (his wife) who knows most about his state of mind?sundaymorningstaple wrote:I had heard early on that the pilot's wife and children left the family home the day before the ill-fated flight. It would seem that the family breakup may well have plausibility as to what happened............
http://www.nzherald.co.nz/air-accidents ... d=11226334
Yes, it stops recording in a crash. Otherwise the FDRs for the AirFrance flight found two years later would have been pointless, no?rdueej wrote:I did some searching online and found that the minimum requirements are 25 hrs for the flight data recorder (FDR) and 2 hrs for the cockpit voice recorder (CVR). ( link1 , link2 )
My question is do these boxes detect failures or accidents and stop overwriting data after a crash ?
Also, I remember reading that the FDR emits sonar signals for tracking it underwater. I would think that these sonar transmissions are not always on, so the FDR should know when it has crashed into the sea. And if it can detect such accidents, it can simply stop overwriting existing data ?
Exactly, that is what I was thinking.zzm9980 wrote:Yes, it stops recording in a crash. Otherwise the FDRs for the AirFrance flight found two years later would have been pointless, no?rdueej wrote:I did some searching online and found that the minimum requirements are 25 hrs for the flight data recorder (FDR) and 2 hrs for the cockpit voice recorder (CVR). ( link1 , link2 )
My question is do these boxes detect failures or accidents and stop overwriting data after a crash ?
Also, I remember reading that the FDR emits sonar signals for tracking it underwater. I would think that these sonar transmissions are not always on, so the FDR should know when it has crashed into the sea. And if it can detect such accidents, it can simply stop overwriting existing data ?
the lynx wrote:Which is still moot, no?PNGMK wrote:It's much longer than 30 mins.... more like 30 hours now with modern boxes.Max Headroom wrote:As I understand it, both black boxes are overwritten every 30 minutes, so even if they did find them, the CVR would have nothing but 30 minutes of white noise and the FDR would show all parameters pretty much flat-lining eh.
And that's if they find them.
...
I tried Googling about the black box rewriting itself but can't find. Can anyone point me to the right direction?