Looks like the memory card on the the black box has been "lost". Is this true? How is it possible if the black box is designed to withstand 3500 g ?
Would the data on the memory card contain information on the door status (locked / unlocked / open / closed
Also, why isn't data streamed to ground stations nowadays? And why black boxes do not float ?
In short, together with the door design, it all looks like amateuristic design.
1. Door-locked status: Don't know, but you can't record everything -- there are already plenty of channels that are captured that are far more important
2. Streaming to ground: The NTSB has been working with other air safety bodies to make recommendations to do just that. One issue is available bandwidth: there just isn't enough of it available. So the amount of information that can be transmitted would be limited.
3. Floating black boxes: Like the downlink scenario, breakaway recorders that float are being looked into. More importantly, though, are better crash locator beacons, so the crash debris field can be found more quickly.