H3.

Maintainability and Maintenance Availability Fill Rate

Based on the below table, provide an estimation of the number of spares required to achieve a fill rate of 90%. For this question, the fill rate is defined as the probability that a spare will be available whenever there is a demand for one.

Part Name Distribution Parameter Estimates TMS actuator Weibull a = 778, B = 0.7 Attitude direction indicator Weibull a = 365, B= 0.65 Fuel flow indicator Weibull a = 1700, B = 0.85 Vertical ref gyro Weibull a = 890, B = 1.12 Altitude selector Weibull a = 375, B= 0.78 Central audio unit Exponential 1/1 = 1020 Navigation controller Exponential 1/) = 1420 Pressure transmitter Weibull a = 219, 3=0.98 Flight data recorder Exponential 1/) = 1280 Auto-pilot computer Exponential 1/) = 1050