Compressed air is then delivered to combustor 16 and {HEAD ~ airflow} from combustor 16 drives {TAIL ~ turbines} 18 and 20 
drives
Compressed air is then delivered to combustor 16 and { HEAD ~ airflow } from combustor 16 drives { TAIL ~ turbines } 18 and 20
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH