CLAUSE CODE: QC88-S    This clause was archived as of 01/22/2009
  CLAUSE TITLE: FLIGHT SOFTWARE MARGINS


QC88-S FLIGHT SOFTWARE MARGINS:

 

Prior to hardware design or procurement, the system (computer, memory, and communication system) shall be analyzed to establish the value of critical parameters needed for proper performance of the software. These parameters are: CPU speeds, control cycle rates, interrupt rates and durations, communications bandwidth/throughput, Random Access Memory (RAM), and Erasable Programmable Read-Only Memory (PROM and EPROM).

At hardware selection time, each critical parameter of the hardware shall have a minimum capability of 400% of the Current Best Estimate.

At PDR, each critical parameter shall have a minimum capability of 200% the Current Best Estimate.

At launch each parameter shall have a minimum capability of 15% of the Current measured value.

Contractor shall provide rationale and recovery options for significant deviations from the margin requirements.