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MIL-HDBK-338B: Electronic Reliability Design Handbook
Complete List of Guideline Documents
10.3.2.1 Parameter Definitions
Mean-time-between-failure-field (MTBFF) includes inherent maintenance events which are caused by design and manufacturing defects.
Mean-time-between-maintenance-field (MTBMF) consists of inherent, induced and no defect found maintenance actions.
Mean-time-between-removals-field (MTBRF) includes all removals of the equipment from the system.
= the predicted MTBF (i.e., estimated by failure rates of the part population)
= the demonstrated MTBF (i.e., controlled testing)
= the equipment type or application constant
C = the power on-off cycles per mission or operating event
D = the mission duration or operating event