Posted on 01/08/2024 12:57:06 PM PST by george76
The cockpit voice recorder data on the Alaska Airlines Boeing 737 MAX 9 jet which lost a panel mid-flight on Friday was overwritten, U.S. authorities said, renewing attention on long-standing safety calls for longer in-flight recordings.
National Transportation Safety Board (NTSB) chair Jennifer Homendy said on Sunday no data was available on the cockpit voice recorder because it was not retrieved within two hours - when recording restarts, erasing previous data.
The U.S. requires cockpit voice recorders to log two hours of data versus 25 hours in Europe for planes made after 2021.
The industry has been wrestling with the length of cockpit recordings since the disappearance of a Malaysian jet in 2014.
Although the Boeing 777 has never been found, the loss of MH370 sharply increased efforts to monitor the longest possible modern flights and where necessary recap earlier flights.
In 2016, members of the United Nations' aviation agency, the International Civil Aviation Organization (ICAO), recommended a 25-hour recording on planes manufactured from 2021, in line with the period of time already used for keeping flight data.
"There was a lot going on, on the flight deck and on the plane. It's a very chaotic event. The circuit breaker for the CVR (cockpit voice recorder) was not pulled. The maintenance team went out to get it, but it was right at about the two-hour mark," Homendy said.
The plane's flight data recorder and cockpit voice recorder were sent to NTSB labs on Sunday to be read but no voice data was available,
...
Although today's recorders use computer chips inside "crash-survivable" containers able to withstand g-forces 3,400 times the feeling of gravity, critics say the capacity for recordings housed inside them remains less than an ordinary cellphone.
(Excerpt) Read more at reuters.com ...
Overwritten?
Sounds like there was something on that tape that wasn’t meant to be disclosed.
there is no reason with storage as cheap as it is now not to have longer recording times.
I am surprised that Boeing has not done this as a standard option seeing as they have to do it in the EU anyway.
But unfortunately Boeing is no longer an engineering driven company.
It must be a fascinating life you lead thinking EVERYTHING is a conspiracy. The window (false door) blew out because someone at Boeing screwed up, and the pilots did a nice job of landing the plane. No one got hurt. End of story.
No, they record continuously like an old-fashioned loop tape recorder (I think at one time they WERE loop tape recorders), so whatever is older than X amount of hours is gone.
I got more storage than that on my cell phone...
Reminds me of the old fashioned roll towels made of cloth in a rolling continuous dispenser for drying your hands in a public bathroom. I never hear calls to bring those back.
The cockpit? What is it?
It’s a room in the front of the plane with the pilots. But that’s not important now?
Longer recording times should not be an issue - nor should it have been “overwritten” immediately after it landed after the incident.
We have all these agencies regulating everything and nobody paying attention to anything.
Sounds like they were using a tape recorder from the 80s.
Why can’t voice and data recordings be uploaded to a satellite so they don’t have to look for “black boxes” after a mishap?
No, the authorities (NTSB investigator) didn't request the recorder be turned off (circuit breaker pulled) when starting the investigation upon landing.
Incompetence is not conspiracy.
“Reminds me of the old fashioned roll towels made of cloth in a rolling continuous dispenser for drying your hands in a public bathroom. I never hear calls to bring those back.”
If you grew up and survived those, you are immune to everything...
There is a reason... just not a good one.
Boeing (or whatever Boeing subcontractor) has a piece of paper that says they get paid if they deliver a voice recorder with a two hour memory window.
They also paid for a quantity of two hour voice recorder memory chips to be made and pass through certification for use in cockpit voice recorders and are now only good to be used for US deliveries, so why not use them up first?
Ex Douglas air craft employees nod
they were not reused.
The used portion was rolled up and then laundered.\
Clean rolls were inserted.
I used to change them out.
>I got more storage than that on my cell phone...
Yes, but it is unlikely to survive a crash at 600kts+.
It’s got gorilla glass....
Proven tough
Sounds like Rose Mary Woods is working for Alaska Airlines.
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