When fuel flow is directed to the last zone by the fuel control the fuel flows directly to the upstream sprayring, while {TAIL ~ fuel flow} to {HEAD ~ the downstream sprayring} is controlled by 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 the fuel control the fuel flows directly to the upstream sprayring , while { TAIL ~ fuel flow } to { HEAD ~ the downstream sprayring } is controlled by 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
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH