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How does a plane’s black box survive a crash?

It’s built like a tank, and it isn’t black. Two bright-orange recorders sit inside steel or titanium shells designed to survive a 3,400-g impact, hours of fire and the pressure of deep water.

How does a plane’s black box survive a crash?

Quick Answer

A “black box” is really two recorders, usually bright orange rather than black: the flight data recorder, which logs measurements such as airspeed, altitude and heading, and the cockpit voice recorder, which records the crew’s voices and cockpit sounds. Each is built to survive what the airplane might not. The memory unit sits inside layers of stainless steel or titanium and heat-resistant insulation. The NTSB lists the design targets as an impact of 3,400 g, fire at 1,100°C (about 2,000°F) for 30 minutes, and the pressure of 20,000 feet of water; newer standards test the fire for an hour. Each recorder also carries an underwater locator beacon that starts pinging when it gets wet, on 37.5 kilohertz, detectable from as deep as 14,000 feet. In January 2026, the FAA finalized a rule that newly built airliners must keep 25 hours of cockpit audio, up from two.

By the Numbers

3,400 gImpact force the memory unit is designed to survive
1,100°CFire temperature it’s tested against (about 2,000°F), for 30 minutes to an hour
20,000 ftWater depth it’s built to withstand
25 hoursCockpit audio newly built U.S. airliners must keep, up from 2 hours

Key Facts

What it is
Two recorders: a flight data recorder and a cockpit voice recorder
Color
Bright orange, not black, to make it easier to find in wreckage
Built for
A 3,400-g impact, 1,100°C fire and 20,000 feet of water
Finding it at sea
A beacon pings at 37.5 kHz once the recorder is submerged

How a recorder is protected

  1. A tough outer shell

    Stainless steel or titanium resists crushing and penetration.

  2. Insulation against fire

    Heat-resistant layers inside the shell protect the memory.

  3. A protected memory unit

    The recorded data sits on memory chips in the crash-survivable core.

  4. A beacon to find it

    An underwater locator beacon pings once the recorder is submerged.

Not a black box

Despite the name, flight recorders are painted bright orange so searchers can spot them in wreckage. Why people started calling them “black boxes” isn’t settled. What matters is the design: one recorder for the flight’s data and one for the cockpit’s sounds.

Built to outlast the plane

The recorders are built to standards that include a 3,400-g impact, crushing force, high-temperature fire and deep-sea pressure. Recorder makers describe an outer shell of stainless steel or titanium and thermal insulation that protects the memory inside. Recorders are typically installed in the tail, the section most likely to stay intact in a crash.

Finding one underwater

Each recorder carries an underwater locator beacon, or “pinger,” that switches on when it’s submerged. It sends an acoustic signal on 37.5 kilohertz that a special receiver can detect from depths of up to 14,000 feet. The beacon runs on a battery, so searchers are racing the clock: older beacons last about 30 days, and newer standards call for 90.

More hours of audio

In January 2026, the FAA finalized a rule requiring newly built airliners to keep 25 hours of cockpit voice recordings, up from two hours. Congress’s 2024 law requires existing passenger planes to be retrofitted by 2030. The change followed a January 2024 Alaska Airlines 737 MAX 9 incident in which cockpit audio was overwritten before investigators could save it. The international standard was already 25 hours.

Myth vs. Fact

MythThe black box is black.

FactRecorders are painted bright orange so they’re easy to spot. Why they’re called “black boxes” isn’t settled.

MythA black box always survives, and is always easy to find.

FactThey’re designed to survive extreme conditions, but a recorder can still be damaged or hard to locate, especially in deep water.

The Bottom Line

A plane’s “black boxes” are two bright-orange recorders sealed inside steel or titanium and insulation, built to survive a 3,400-g impact, fire and deep water, with a beacon to help searchers find them.

Sources & Further Reading