The aircraft fuel system control circuit may also, in the second embodiment, include pre existing jettison system valve control circuitry 400 or design provision for {TAIL ~ optional jettison system valve control circuitry} 400 through {HEAD ~ a daughterboard, external signal and power bus}, or the like 
The aircraft fuel system control circuit may also , in the second embodiment , include pre existing jettison system valve control circuitry 400 or design provision for { TAIL ~ optional jettison system valve control circuitry } 400 through { HEAD ~ a daughterboard , external signal and power bus } , or the like
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH