Black box consists flight data recorder (FDR) (also ADR, for accident data recorder) and cockpit voice recorder (CVR).
FDR and ADR is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. It is a device used to record specific aircraft performance parameters.
CVR records conversation in the cockpit, radio communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds.
Air-plane black box is coated with heat-resistant bright orange paint for high visibility in a wreckage. The term black box is a name used to refer to a collection of several recording devices used in transportation. These include: flight recorders, the event recorder in railway locomotives, the event data recorder in auto-mobiles and message case in ships.
Materials that provide a barrier for the memory boards, starting at the innermost barrier:
1.Aluminum housing - a thin layer of aluminum around the stack of memory cards.
2.High-temperature insulation - dry-silica material, 1 inch (2.54 cm) thick, provides high-temperature thermal protection, keeps the memory boards safe during post-accident fires. 3.Stainless-steel shell- The high-temperature insulation material is contained within a stainless-steel cast shell that is about 0.25 inches (0.64 cm) thick. Titanium can be used to create this outer armor as well.