— The device could have an electrical short or catch on fire. Pilots would want to shut it down rather than risk a fire spreading to the rest of the cockpit or airplane.
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It's also worth noting that if the transponder is switched off you generally only lose two pieces of information: the flight identification (mode A & mode S data) and altitude (mode C data). Primary radar will still paint a target (albeit unidentified) as long as the aircraft is within radar range.
However, each ELT is specifically designed for each aircraft, so it cannot be tampered with. You also cannot turn off the black box, as it runs throughout the flight, recording every 30 to 60 seconds.
Yes, weather radar can help predict convective turbulence and clear air turbulence. Most commercial aircraft now pack weather radar – from the Airbus A321 to the Boeing 777.
No keys for commercial jetsThe fact that they operate from secure airports is enough to mean that they have not been designed this way. When left at a gate, doors may be marked or taped so that crew will know if someone attempted to access the cabin, but they will not be locked.
Has a black box ever been destroyed? There are a handful of cases in which black boxes have not been recovered, and a couple of cases in which the flight data recorder was found but not the cockpit voice recorder, or vice versa. Rarely, a recorder is recovered but blank or too damaged to read.