Abstract: In this paper, we present the study of the two-parameter Weibull distribution theory and its parameters (shape ß and scale a) using Weibull Probability Plotting. Using the failure data for haul trucks in operation at a marble quarry, we obtain the fatigue life equation by regression under different failure probabilities. Weibull distribution analysis for reliability and maintainability is showing a tendency of increasing failure rate, leaving room for decisions on reliability centered maintenance planning, machine improvements, optimal load and the need for review of data collection process.

Keywords: Reliability, Weibull distribution, Availability, Maintenance, Monitoring.