Mission Failure Rate

Windchill Risk and Reliability Desktop Help > Windchill Prediction > Prediction Support Files > Mission Profile Files > Mission Failure Rate

The mission failure rate is the sum of the failure rates for each phase. The equation for computing the failure rate of an active phase is:

Active Failure Rate * Mission Phase Percentage

The equation for computing the failure rate of a dormant phase is:

Active Failure Rate * Dormant Conversion Factor * Mission Phase Percentage

The active failure rate is computed using the selected active environment and temperature. The dormant conversion factor is the factor for converting from the selected active phase to the selected dormant phase. If no valid conversion exists from the active phase to the dormant phase, it is assumed that the dormant failure rate is equal to the active failure rate.

Example

Assume that the Mission Profile file contains the information in the table below.

Phase	Environment	Temperature	Percent
Startup	GB, GC - Ground Benign, Controlled	30	15
Flight	AIC, AC - Airborne Inhabit Cargo, Commercial	10	75
Landing	GM - Ground Mobile	30	10

The information in this table in interpreted as follows:

• Calculate 15% of the mission using an environment of Ground Fixed at a temperature of 30 degrees C.

• Calculate 75% of the mission using an environment of Airborne, Inhabited Cargo at 10 degrees C.

• Calculate the final 10% of the mission using an environment of Ground Mobile at 30 degrees.