a cold air take off 17 downstream of {TAIL ~ the fan} 6 of {HEAD ~ the engine}, 
a cold air take off 17 downstream of { TAIL ~ the fan } 6 of { HEAD ~ the engine } ,
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH