A fail-safe or fail-secure describes a device which, if (or when) it
fails, fails in a way that will cause no harm or at least a minimum of harm to other devices or danger to personnel. Examples include:
Luggage carts in airports in which the hand-brake must be held down at all times. If it is released, the cart will stop. See
dead man's switch.
Air brakes on railway
trains and trucks. The brakes are held in the 'off' position by air pressure created in the brake system. Should a brake line split, or a carriage become de-coupled, the air pressure will be lost and the brakes applied. It is impossible for the train to be driven with a leak in the brake system.
Avionics using redundant systems to perform the same computation with
voting logic to determine the "safe" result.Motorized gates - In case of power outage the gate can be pushed open by hand with no crank or key required. However, as this would allow virtually anyone to go through the gate, a fail-secure design is used: In a power outage, the gate can only be opened by a hand crank that is usually kept in a safe area.An
operation which ensures that a failure of equipment, process, or
system does not propagate beyond the immediate environs of the failing entity.The automatic protection of programs and/or processing systems when a
hardware or
software failure is detected in a
computer system. See
fail-safe (computer).A
control operation or function that prevents improper system functioning or
catastrophic degradation in the event of
circuit malfunction or operator error; for example, the failsafe
track circuit used to control
railway block signals.A system that has been structured such that it cannot fail (or that the probability of such failure is extremely low) to accomplish its assigned mission, regardless of environmental factors; for example, the hardening of a
nuclear missile bunker, or the dispersion of nuclear
bombers to multiple secret locations.A precautionary secondary mechanism that achieves the same task as the primary mechanism; for example, the activation of grenades when the primary detonator is destroyed, or the release of lethal gas when a device that activates explosives is destroyed. Aircraft landing on an
aircraft carrier increase the throttle to full power at touchdown. If the arresting wires fail to capture the plane, it safely takes off again.During the
Apollo program of Moon landings, the spacecraft was put on a free return trajectory – if the engines failed at lunar orbit insertion, the craft would safely coast back to Earth.The iron pallet ballast on the
Bathyscaphe is dropped to allow the submarine to ascend. The ballast is held in place by electromagnets. If electrical power fails the ballast is released, and the submarine then ascends to safety.
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A
fail-safe describes a device which, if or when it fails, will cause a minimum of harm.Fail-safe may also refer to:
Fail-Safe (novel), a 1962 novel about an accidental sortie of American nuclear bombers against the USSR
Fail-Safe (1964 film), a 1964 film, based on the novel, directed by Sidney Lumet
Fail Safe (television), a 2000 made-for-television play, based on the novel, starring George Clooney
"Fail Safe" (Stargate SG-1), an episode of the science fiction television series
Failsafe (UK band), a Preston-based indie rock band
FailSafe, a software development company in South Africa
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A PROVA D'ERRORE. A PROVA DI GUASTO. SICURO. CHE NON SBAGLIA. D'ARRESTO. D'EMERGENZA. RENDERE SICURO. RENDERE A PROVA D'ERRORE. FERMARSI IN CASO DI GUASTO [DETTO DI MECCANISMO]. INTERROMPERSI IN CASO DI GUASTO [DETTO DI MECCANISMO]
adj. เกี่ยวกับระบบป้องกันภัย, เกี่ยวกับระบบเครื่องกลที่มีเครื่องกลสำรองในกรณีที่เครื่องกลแรกหยุดทำงาน; ที่ติดตั้งด้วยอุปกรณ์ป้องกันภัย, การรับประกันว่าไม่มีข้อผิดพลาด n. อุปกรณ์ป้องกันภัย
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