IntroductiontoAircraftDesignChapter8Whydoaircraftcostsomuch?*,whilstthelatteraretermedoperatingcostforcivila/candlife-cyclecostsformilitarya/.**:highperformancerequirements,safetyconsideration,qualitycontrol,toolingrequirements,labor-intensiveproduction(),highoverheads,largefinancialinvestment,interestcost(),,particularlyinreducingdevelopmenttimesandimprovinginitialbuildquality.**‘top-down’and‘bottom-up’.Theformerisusedduringtheconceptualorpreliminarydesignstages,‘bottom-up’approach.**-downapproaches,,.**,,basedonworkperformedbyaCrandfieldstudent,SpencerWoodford,whichistobepublishedinhisPhDthesis.**-(IOC)arethoseassociatedwithrunninganairline,,salesandpublicity,.**(DOC)dova
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