Avionics components are subjected to acceptance random vibration tests to verify their parts and workmanship prior to flight. This is particularly important for circuit boards which have piece parts with vulnerable solder joints and lead wires. The acceptance test levels usually envelope the maximum expected flight environment as well. The acceptance test may thus serve two purposes.
A number of somewhat similar random vibration power spectral densities curves have been specified in historical references as “minimum workmanship” levels, as show in the figures in workmanship_psds.pdf
These levels typically apply to components whose mass does not exceed 23 kg (50 lbm).
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– Tom Irvine