▁a ▁high ▁f idel ity , ▁real - time ▁sim ulator ▁and ▁therefore ▁has ▁a ▁higher - bur den ▁rate . ▁Therefore , ▁it ▁is ▁more ▁econom ical ▁to ▁develop ▁and ▁test ▁while ▁connected ▁to ▁a ▁H IL ▁sim ulator ▁than ▁the ▁real ▁plant . ▁For ▁jet ▁engine ▁manufact ur ers , ▁H IL ▁simulation ▁is ▁a ▁fundamental ▁part ▁of ▁engine ▁development . ▁The ▁development ▁of ▁Full ▁Author ity ▁Digital ▁Engine ▁Cont rollers ▁( FA DE C ) ▁for ▁aircraft ▁jet ▁engines ▁is ▁an ▁extreme ▁example ▁of ▁a ▁high - bur den - rate ▁plant . ▁Each ▁jet ▁engine ▁can ▁cost ▁millions ▁of ▁dollars . ▁In ▁contrast , ▁a ▁H IL ▁sim ulator ▁designed ▁to ▁test ▁a ▁jet ▁engine ▁manufact urer ’ s ▁complete ▁line ▁of ▁engines ▁may ▁demand ▁merely ▁a ▁t enth ▁of ▁the ▁cost ▁of ▁a ▁single ▁engine . ▁ ▁Early ▁process ▁human ▁factors ▁development ▁ ▁H IL ▁simulation ▁is ▁a ▁key ▁step ▁in ▁the ▁process ▁of ▁developing ▁human ▁factors , ▁a ▁method ▁of ▁ens uring ▁us ability ▁and ▁system ▁consist ency ▁using ▁software ▁erg onom ics , ▁human - fact ors ▁research ▁and ▁design . ▁For ▁real - time ▁technology , ▁human - fact ors ▁development ▁is ▁the ▁task ▁of ▁collect ing ▁us ability ▁data ▁from ▁man - in - the - loop ▁testing ▁for ▁components ▁that ▁will ▁have ▁a ▁human ▁interface . ▁ ▁An ▁example ▁of ▁us ability ▁testing ▁is ▁the ▁development ▁of ▁fly - by - wire ▁flight ▁controls . ▁Fly - by - wire ▁flight ▁controls ▁eliminate