'Noise' confirmed in last part of Metrojet's cockpit voice recording

[webfact]

'Noise' confirmed in last part of Metrojet's cockpit voice recording

MOSCOW: -- The head of an investigation committee into last weekend’s Metrojet plane crash confirmed a “noise” was heard in the last second of the cockpit voice recording.

Ayman el-Muqadem said debris from the plane was scattered over a wide area, which is consistent with an in-flight break-up.

“A noise was heard in the last second of the CVR [cockpit voice recorder] recording. A spectral analysis will be carried out by specialized labs in order to identify the nature of this noise.

One unidentified reporter asked why other investigators responsible for listening to the black box were absent from the news conference.

Euronews correspondent Mohammed Shaikhibrahim reported: “The absence of the representatives of other international commissions caused confusion and raised many questions from people here. This keeps the door open to more speculation and controversy about what caused the Russian plane to crash.”

Russian and Egyptian emergency workers laid flowers where the Russian Metrojet plane crashed one week ago in the Sinai Peninsula. It had been flying from Sharm-el Sheikh to St Petersburg when it was downed killing all 224 people on board.


-- (c) Copyright Euronews 2015-11-09

[Dustdevil]

This begs the question;

Who profits from the subterfuge?

I think the absence of legitimate investigators means they know it's business as usual with Arabs and especially Egyptian authorities--who, remember, blamed that Egypt Air suicide pilot's crash on Boeing planes. Having spent 19 years in the Middle East, it's my observation that they TEND (not always) to say whatever makes them feel better. Conspiracy theories involving the USA always let them off the hook, and science doesn't even exist. I taught Saudi officers...most seemed to believe dinosaurs are just make-believe. And on and on.

Edited November 9, 2015 by Dustdevil

[MaxYakov]

If it was a bomb it should be patently obvious, considering the damage to the aircraft in an (apparently) short period of time and evidence of it shouldn't have to depend on a one-second burst of "noise" on the CVR (IMHO). Case in point: Pan Am 103 (Lockerbie) bombing where there was considerable that a bomb had exploded in the forward cargo hold.

While considering the above, here's a MythBusters experiment with explosive decompression as a distraction. It does bring to mind a couple of interesting questions:

Does the A321 FDR record cabin pressure as an aircraft flight parameter and could it record a pressure/blast wave that was the result of an explosion?

Would a structural failure that resulted in explosive decompression that was NOT caused by an internal explosion create a pressure wave similar to that of an explosive device? If so, what would be the physical explanation of such a pressure wave?

Edited November 9, 2015 by MaxYakov