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Effective Failure Rate of Two Active Redundant Units, with Different Failure Rates, without Repair

This tool calculates the effective failure rate of two active on-line units, where "1 of 2" units are required for success. Each unit may have a different failure rate. The calculation implements Equation 5 shown on page 90 of the United States Air Force Rome Laboratory Reliability Engineer's Toolkit (1993).

Reliability Block Diagram:


Reliability Block Diagram showing two active units with different failure rates.  1 of 2 required for success.

Calculation Inputs:

Decimal places:



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References:

  1. United States Air Force Rome Laboratory Reliability Engineer's Toolkit (1993).
  2. MIL-HDBK-338, Electronic Reliability Design Handbook.
  3. Klion, Jerome, A Redundancy Notebook, Rome Air Development Center, RADC-TR-77-287, December 1987.
  4. Reliability Modeling and Prediction, MIL-STD-756B, November 1981.