This report presents the logic leading to a mathematical expression for mission availability. Mission availability is treated as the probability that the cumulative downtime occurring during a mission of given length will be less than the time constraint. This is opposed to more general approaches such as steady state or instantaneous availability or operating time versus real time. We intend to present a practical and usable mathematical model by deduction and demonstration. The development is based on exponentially distributed downtimes. Experience shows that certain systems follow exponential downtime distributions except near zero. This error is often so small that it may be neglected. A future report will present a downtime distribution which will account for this small error.
This 1817 print titled East India House depicts the London headquarters of the powerful East India Company. The detailed architectural rendering highlights the building’s significance as a center of global trade and colonial administration during the British Empire.
The establishment of the St. Marks Lutheran church in Huntsville was fundamental in providing the German Rocket Team - primarily the women - not only for worship and faith-activities, but as a communal place to cultivate cultural continuity and social connections.
Here, the women are gathered for an event, dressed in traditional German clothing and provided vocal entertainment.
