The black box's orange exterior typically sports reflective decals and the command “do not open.” It can be opened, but doing so is left to authorities independent of the airlines, to ensure the memory is not compromised.
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Designed to surviveThe critical part of the black box is the crash-survivable memory and data storage. Earlier recorders used analog tape, but digital solid-state memory is used today. This is contained in a cylindrical housing engineered to survive extreme impact, heat, and pressure and protect the memory inside.
Limitation of Black BoxLimited data types: The black box only records certain types of data, such as flight data and cockpit audio, and may not capture other important information that could be relevant to an investigation.
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.
Answer: If a flight data recorder is recovered from the water, it is submerged in fresh, clean water to prevent deposits such as salt or minerals from drying out within the device.
Flight recorders are designed to survive both high-speed impact and post-impact fire. They are, however, not invulnerable and are sometimes destroyed. The recorder is designed to ensure that data, rather than the recorder itself, survives an accident.
The black box is designed to be as strong as granite. Even at a temperature of 1100 degrees Celsius, the structural integrity can remain intact for a certain period. This gives the industry an opportunity to research the reason for the plane crash and what can be done to prevent future accidents.
An aircraft actually has two black boxes. One is a flight data recorder, which stores information on specific parameters such as flight control and engine performance. The second is a cockpit voice recorder, which records background sound and conversations between crew members and air traffic control.