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"The airline declined to say if the flight data recorder or cockpit voice recorder were analyzed after the flight, though the CVR would've been overwritten by t

"The airline declined to say if the flight data recorder or cockpit voice recorder were analyzed after the flight, though the CVR would've been overwritten by the two-hour recording duration" How is the recording duration only 2 hours? Is there some non-technical limitation here?

fragmede 4y ago
Yes the pilot's union.
justicz 4y ago
Found some details here https://aviation.stackexchange.com/questions/27636/why-are-cockpit-voice-recorders-limited-to-2-hours-recording https://aviation.stackexchange.com/questions/27636/why-are-c...
pvarangot 4y ago
Maybe there was in 2003 when a quick search says they last amended the regulations, up from 30 minutes that were deemed insufficient? Changing that regulation probably has incredible cost as the certification process for stuff on airplanes is lengthy.
worewood 4y ago
Multiple channel uncompressed audio, with separate tracks for each pilot, ambient sound, ATC, cabin and/or more. Plus this is done with decades old tech because the blackbox has limited space due to the armored construction and the chips need to be hardened
- olliej 4y ago
  Adding additional storage doesn't seem like it should be impossible - sure have your backup uncompressed data, but you can have hours and hours of compressed audio in negligible space as well.
  - mumumu 4y ago
    The aviation industry is averse to change. Most planes are still being updated with floppy disk. But I agree. High end commercial solid storage, such Optane, would likely exceeds the requirements needed by the aviation industry.
    - olliej 4y ago
      I understand the aversion to change (no change = wings stay on, change = wings come off?), but I feel adding an additional CVR storage should be low risk - not even necessarily the official armored/blackbox CVR, but say on the quick access recorder - on the basis that the black box CVR is likely more likely required in an instance where the aircraft did end up in a position where the CVR does represent the end of recording. The existence of extended CVR length would also make the access to poppable breakers for the CVR less important and less error prone.
weeblewobble 4y ago
Pilots understandably don’t like it (invasion of privacy, exposes them to liability, etc) and they have labor power

fragmede 4y ago

Yes the pilot's union.

justicz 4y ago

Found some details here https://aviation.stackexchange.com/questions/27636/why-are-cockpit-voice-recorders-limited-to-2-hours-recording https://aviation.stackexchange.com/questions/27636/why-are-c...

pvarangot 4y ago

Maybe there was in 2003 when a quick search says they last amended the regulations, up from 30 minutes that were deemed insufficient? Changing that regulation probably has incredible cost as the certification process for stuff on airplanes is lengthy.

worewood 4y ago

Multiple channel uncompressed audio, with separate tracks for each pilot, ambient sound, ATC, cabin and/or more. Plus this is done with decades old tech because the blackbox has limited space due to the armored construction and the chips need to be hardened

olliej 4y ago
Adding additional storage doesn't seem like it should be impossible - sure have your backup uncompressed data, but you can have hours and hours of compressed audio in negligible space as well.
- mumumu 4y ago
  The aviation industry is averse to change. Most planes are still being updated with floppy disk. But I agree. High end commercial solid storage, such Optane, would likely exceeds the requirements needed by the aviation industry.
  - olliej 4y ago
    I understand the aversion to change (no change = wings stay on, change = wings come off?), but I feel adding an additional CVR storage should be low risk - not even necessarily the official armored/blackbox CVR, but say on the quick access recorder - on the basis that the black box CVR is likely more likely required in an instance where the aircraft did end up in a position where the CVR does represent the end of recording. The existence of extended CVR length would also make the access to poppable breakers for the CVR less important and less error prone.

weeblewobble 4y ago

Pilots understandably don’t like it (invasion of privacy, exposes them to liability, etc) and they have labor power