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