1. Why are cockpit voices recorded only in the black box? If other data from a plane is constantly being sent for maintenance purposes, while in flight, why do planes not also not relay cockpit voices to some storage system, for just such a situation? CCTV keeps footage for a few hours or a few days, why is this kind of valuable data not also routinely stored?
Streaming material from an aircraft to ground stations would only work reliably over a satellite link which I understand from talking to airline people is expensive but then nowadays they are offering internet on transatlantic flights so it can't be that expenisive. Things like installing CCTV are technically possible but for all manner of reasons including things like: safety assessments, corporate bureaucracy and the fact that aircraft can't be grounded long enough for equipment to be installed for profit reasons (down time, obscene prices of aircraft electronics and other spares) the upgrading of commercial airliners tends to move at a glacial pace. Just for example, there are variants of some Boeing airliner (777 iirc) flying around the world with a bug in their FANS equipment that causes a faulty log-off. This is not a critical issue but it is just bloody annoying for flight control staff around the world. This could be fixed with a simple software update but getting that patch certified, getting an airline bean counter to shell out the money and finally catching the aircraft on the ground long enough to have the patch installed takes a loooooooooooooooooooooooong time.