despegue:
you want facts?
Here is one: IT IS BLOODY IMPOSSIBLE to hear breathing on a CVR unless oxygen masks are worn! Any mention aboutnhearing breating on the cvr is pure fantasy unless mr. Lubitz was wearing his mask. ( and if he was wearing it, why?!)
On modern CVRs, pilot headset microphones are HOT microphones -- they are always on (whether the PTT button is pressed or not) and are always recorded on the CVR.
Breathing can be heard on these hot channels.
On these CVRs, four channels are assigned:
Channel 1: Captain HOT microphone
Channel 2: FO HOT microphone
Channel 3. Cockpit Area Microphone (CAM)
Channel 4: Public Address
Per regulations, large turbine aircraft installed after October 1991 must use hot microphones. CVRs on older aircraft must be retrofitted to comply with the new requirements by April, 2012.