Select the most cost-effective maintenance strategy based on failure pattern and detectability.
How to select between CBM, Time-Based PM, RTF, or Redesign?
Based on the SAE JA1011 / Nowlan & Heap decision logic: (1) If a failure is hidden, assign a Failure Finding Task (FFT); (2) If a precursor exists with adequate P-F warning time, select Condition-Based Maintenance (CBM); (3) If age wear-out exists (β > 1.5), choose Time-Based PM; (4) If random without safety impact and low repair cost, choose Run-to-Failure (RTF); (5) If safety is compromised without viable proactive tasks, Redesign is mandatory.
Toggle failure mode characteristics:
Research across airlines and industrial plants proved that 68% to 89% of equipment failure modes occur randomly with age. Calendar-based time-directed PMs on random equipment induce human error and infant mortality. This decision tree ensures every maintenance dollar is spent on technically feasible tasks.
Establish non-destructive inspection frequencies that guarantee early failure detection.
Maintenance Planning & StrategyConduct structured Reliability Centered Maintenance decision audits on critical systems.
Cost & Economic DecisionsJustify asset replacement vs continued repair with defensible economic life metrics.