Editing Heading Alignment Cone
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[[Image:STS-117 approach path.gif|thumb|200px|right|The HAC is cleary shown on the flight path of STS-117.]] | [[Image:STS-117 approach path.gif|thumb|200px|right|The HAC is cleary shown on the flight path of STS-117.]] | ||
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A '''Heading Alignment Cone (HAC)''' is a virtual truncated cone, used to guide NASA's [[Space Shuttle]] onto the centerline of a runway for landing. Some publications also name it ''Heading Alignment Cylinder'', but that is not the official NASA terminology. The radius of a HAC is about 18,000 feet in 22 NM altitude. | A '''Heading Alignment Cone (HAC)''' is a virtual truncated cone, used to guide NASA's [[Space Shuttle]] onto the centerline of a runway for landing. Some publications also name it ''Heading Alignment Cylinder'', but that is not the official NASA terminology. The radius of a HAC is about 18,000 feet in 22 NM altitude. | ||
For alignment with the runway, the surface of the '''HAC''' is followed by the [[Shuttle]] orbiter until runway alignment is achieved, with the point, where the final glide path meets the '''HAC''', being called ''Nominal Energy Point'' (NEP). | For alignment with the runway, the surface of the '''HAC''' is followed by the [[Shuttle]] orbiter until runway alignment is achieved, with the point, where the final glide path meets the '''HAC''', being called ''Nominal Energy Point'' (NEP). | ||
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