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* The third row in the matrix covers a different design feature of the nozzle actuators - the velocity or slew rate requirement, which translates to nozzle throat area rate of change. While the uncertainty is assessed as moderate and the non-recurring impact as high (due to servo valve redesign costs), the remainder of the recurring impacts are minor. In this case, the overall assessment is given a "Moderate" rating. * The fourth row represents the fuel pump flow capacity which might be sized either by an engine starting condition at minimum cranking speed or by the maximum simultaneous actuation flow demand (multiple actuators slewing at the same time). The requirement uncertainty was considered high (20 gallons per minute (gpm) out of a nominal 100 gpm requirement). Increasing the flow capacity is done by growing the pumping element (gear length for a gear-type pump, vane length for a vane pump, impeller depth for a centrifugal pump, etc.) which translates to a 5 lb weight increase and a $1000 product cost increase, both considered a high impact. This combination results in an overall "High" rating. * The fifth row in the matrix includes a FADEC gas path pressure sensor (inlet, burner, or augmentor duct pressure) that is used for basic engine thrust and stability scheduling. The uncertainty of this requirement is shown as a very small value since pressure sensor error can be translated into stall margin reduction and thrust scheduling error with reasonably good accuracy. Even though the non-recurring impact of redesigning the sensors is high, the overall risk level is given a "Low" rating since the uncertainty is low and all other recurring impacts are low. * The sixth row represents the low rotor, or Ni speed sensor. The low rotor speed sensing accuracy requirement is primarily driven by the accuracy of scheduling thrust. This requirement can be analyzed quite accurately using a steady-state engine simulation, 88PDF Image | Improving Gas Turbine Engine Control System
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