When fuel flow is directed to the last zone by the fuel control the fuel flows directly to the upstream sprayring, while fuel flow to the downstream sprayring is controlled by {HEAD ~ a valve} which is closed at a lower range of bypass ratios and open at {TAIL ~ a higher range} of bypass ratios to direct fuel thereto, for spraying adjacent the outer wall 
When fuel flow is directed to the last zone by the fuel control the fuel flows directly to the upstream sprayring , while fuel flow to the downstream sprayring is controlled by { HEAD ~ a valve } which is closed at a lower range of bypass ratios and open at { TAIL ~ a higher range } of bypass ratios to direct fuel thereto , for spraying adjacent the outer wall
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