MIL-PRF-122A, PERFORMANCE SPECIFICATION, RESISTORS, FIXED, PRECISION, ESTABLISHED RELIABILITY, GENERAL SPECIFICATION FOR (19 FEB 1990) [SUPERSEDING MIL-R-122] [S/S BY DSCC DWGS 97009, 97010 AND 97011]., This specification covers the general requirements for hermetically sealed, high precision, low reactance, fixed, resistors that possess a high degree of stability with respect to time under severe life failure rates ranging from 1 percent to 0.001 percent per 1,000 hours (see 1.2.1.2). These failure rates are established at 60percent confidence on the basis of life tests.