Northrop weli ma aysan ku kalsooneyn xakamaynta duulimaadka ee fly-by-wire waxayna haysatay farsamooyinka duulimaadka farsamada. Diyaaradda ka dhalatay, oo la soo bandhigay 28kii Janaayo 1971, ayaa lagu xayeysiiyay culeys ugu badnaan 40,000 lb (18,144 kg) iyo xawaare ugu badnaan Mach 2, laakiin xiisaha yar ee iibsadayaasha ajnabiga ah. Nooca ugu horreeya (lambarka taxanaha 72-156 mph) waxaa lagu soo rogay Hawthorne 4tii Abriil 1974; duulimaadkeedii ugu horreeyay ee Edwards AFB wuxuu yimid 9kii Juun iyadoo Henry "Hute" Cho ee kontaroolada duulimaadka uu gaadhay 61 daqiiqo oo duulimaad ah 18,000 feet iyo xawaare ugu badnaan 610 km / saacad.
345.5 oo