Effective Failure Rate of "n" Active Redundant Units, with "m" Required for Success (without Repair)

This tool calculates the effective failure rate of "n" active online units, where "m" are required for successful operation. The calculation implements Equation 4 shown on page 90 of the United States Air Force Rome Laboratory Reliability Engineer's Toolkit (1993). It assumes that no repair of failed redundant units is possible.

Reliability Block Diagram:

Calculation Inputs:

Number of units required for mission success (m):

Total number of active on-line units (n):

Unit failure rate (λ), failures per million hours (FPMH): Unit MTBF, hours:

Decimal places: 2 0 1 2 3 4 5 6 7 8 9 10 15 20

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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.

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