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The highlighted term "longer", I think it should have been lower.

What is longer reliability?

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  • \$\begingroup\$ Longer service life or longer time between failures I guess. \$\endgroup\$
    – mkeith
    Aug 7 at 7:57
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    \$\begingroup\$ Yes, lower is how it should read. \$\endgroup\$
    – Andy aka
    Aug 7 at 9:03
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If probability of successful operation is the opposite of mean time to failure MTTF and failure rates are constant for each part, then longer MTTF’s result in longer reliability periods. But confidence factors are used here for the probability of MTBF and FIT rates.

Preventive maintenance test plans also increase the duration of reliability. These intervals are adjusted according to the margin of the test results. In the grid power industry, they often have 4 levels of ratings for each test type from annual, to monthly to weekly to remove and replace for escalation levels of monitoring margins. E.g. explosive gas concentration levels, temperature rise, PD levels, etc.

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  • \$\begingroup\$ How is it that "probability of successful operation is the opposite of mean time to failure MTTF". Isn't MTTF the UP time? which means the larger the MTTF the larger the reliability. \$\endgroup\$
    – OMAR
    Aug 9 at 3:23
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    \$\begingroup\$ Yes but probability of running decreases in time as it approaches MTTF \$\endgroup\$ Aug 9 at 9:40

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