Engineering mitigations. This mitigation eliminates the safety risk of the consequences of the unsafe event or condition, for example, by providing interlocks to prevent thrust reverser activation in flight.
Control mitigations. This mitigation accepts the safety risk of the consequences of the unsafe event or condition but adjusts the system to mitigate such safety risk by reducing it to a manageable level, for example, by imposing more restrictive operating conditions. Both engineering and control mitigations are considered “hard” mitigations, since they do not rely on flawless human performance.
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