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Alaska 737 cockpit voice recorder data erasure renews industry safety debate (gazette.com)

submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]

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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 an industry call 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 International Civil Aviation Organization (ICAO) has since 2016 called for 25-hour recording on planes manufactured from 2021.

"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 NTSB has been vocal in calling for the U.S. to extend its rule to 25 hours. The U.S. Federal Aviation Administration (FAA) a month ago said it was proposing to extend to 25 hours – but only for new aircraft.

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[–] sukhmel 1 points 10 months ago* (last edited 10 months ago) (2 children)

As far as I know, there's telemetry from the whole plain, not only the voice recording, so there might have been something useful ¯\_(ツ)_/¯

Edit: but just after responding I found out that the rest of the data is intact, so I was wrong

[–] [email protected] 2 points 10 months ago

Yeah, I might have been unclear, I knew that other telemetry was available and it was just the voice recordings that were wiped due to the time they operated after the incident.

[–] [email protected] 1 points 10 months ago

Telemetry is going to be numerical data that likely compresses very well, so even with a large amount of sensors I can't imagine it taking that much.

And yeah, voice users significantly less than video, where modern cheap dash cams can record days on a small SD card. Methinks flight recorders can do better. At the least they should be viable for the max flight time of the aircraft.