A reduced flow of {TAIL ~ cooling air} is enabled at {HEAD ~ conditions} other than engine full throttle 
A reduced flow of { TAIL ~ cooling air } is enabled at { HEAD ~ conditions } other than engine full throttle
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH