Why Are Black Boxes Bright Orange?

The devices commonly called black boxes are usually painted bright orange. Their appearance is designed for the moment when an aircraft may no longer be recognizable.

Large commercial aircraft generally carry two crash protected recorders. The flight data recorder stores information such as altitude, speed, heading, and the operation of aircraft systems. The cockpit voice recorder preserves recent sounds and conversations from the cockpit. Investigators use the two records together to reconstruct what happened before an accident.

The recorders are commonly installed near the tail because that section has often proved relatively survivable in crashes. Their memory units are protected by strong enclosures designed to resist violent impact, fire, crushing pressure, and immersion.

Orange or yellow coloring, reflective markings, and clear identification make the units easier to notice among soil, vegetation, wreckage, or dark water. The purpose is not to make them visible while the aircraft is flying. It is to make them stand out after everything around them has been broken apart.

Recorders used on flights over water also carry underwater locator beacons. When submerged, a beacon begins producing repeated acoustic pulses that search equipment can detect. The signal helps recovery teams narrow the search, although deep water, difficult terrain, and a limited battery life can still make retrieval challenging.

The origin of the nickname black box is uncertain. It may have grown from early aviation terminology for mysterious or enclosed electronic equipment, rather than from the color of the recorder.

Whatever the source of the name, the color follows the opposite logic. The box preserves hidden information, but it is painted to be found.