When fuel flow is directed to the last zone by {TAIL ~ 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 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 { TAIL ~ 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 a higher range of bypass ratios to direct fuel thereto , for spraying adjacent the outer wall
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