NASA estimated that the chance of a "critical-item failure" (that is, catastrophic failure) within the U.S. Space Shuttle's main engines is 1 in 63 for each mission. What is the probability that at least one of the eight shuttle missions scheduled in a year results in a critical-item failure? What is the probability that at least one of the 40 shuttle missions scheduled over 5 years results in a critical-item failure?

Critical Failure - TV Tropes

Critical Failure detected, stop driving when safe.