Editing Heading Alignment Cone

The '''Heading Alignment Cylinder (HAC)'''  is actually a virtual truncated cone, used to guide NASA's [[Space Shuttle]] onto the centerline of a runway for landing. The radius of a HAC is about 18,000 feet, and will be entered at about 22 NM of altitude. It consists of one smooth turn along with a high rate of descent.

The '''HAC''' is followed until landing runway alignment, plus or minus 20 degrees, has been achieved. 

Once, there was an add-on that visualized the flight path throughout the descent, however this add-on is not found in the Orbithangar.

[http://www.nasa.gov/images/content/180633main_EDW219_close.gif]

''The HAC is cleary shown on the flight path of STS-117.''
@@ Line 1: / Line 1: @@
-[[Image:STS-117 approach path.gif|thumb|200px|right|The HAC is cleary shown on the flight path of STS-117.]]
+The '''Heading Alignment Cylinder (HAC)'''  is actually a virtual truncated cone, used to guide NASA's [[Space Shuttle]] onto the centerline of a runway for landing. The radius of a HAC is about 18,000 feet, and will be entered at about 22 NM of altitude. It consists of one smooth turn along with a high rate of descent.
-[[Image:Definition Spiral HAC.png|thumb|200px|right|NASA definition of the spiral HAC used for the shuttle]]
-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).
+The '''HAC''' is followed until landing runway alignment, plus or minus 20 degrees, has been achieved.
-[[Category: Articles]]
+Once, there was an add-on that visualized the flight path throughout the descent, however this add-on is not found in the Orbithangar.
-[[Category: Glossary]]
+[http://www.nasa.gov/images/content/180633main_EDW219_close.gif]
+''The HAC is cleary shown on the flight path of STS-117.''