[losvedir]

No. For example train signalling which controls whether a train can do onto a section of track operates in a fail safe manner, where if something goes wrong, the signal fails into a safe "closed" state rather than an unsafe "open" state. This means trains are incorrectly being told to stop even though technically the tracks are clear, rather than incorrectly being told to go even though there is another train ahead.

"fail-safe" doesn't mean "doesn't fail", it means that the failure mode chooses false negatives or false positives (depending on the context) to be on the safe side.