VGSIVisual Glide Slope Indicator
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You dig to remember that VGSI is Visual Glideslope Indicator; among the several varieties found, the PAPI (Precision Approach Path Indicator) is the most common, followed by VASIs (Visual Approach Slope Indicators).
We were told the 3.41-degree glidepath angle generated--and, again, the VGSI and descent angles are not coincident.
The VGSI can only be received out to 4 miles, whereas the ILS glideslope intercept altitude is 4.8 miles from the runway.
Those notes on the AeroNav chart about the VGSI requirement sure seem unnecessary and redundant.
Waivers for 20:1 visual area penetrations existing below the VGSI obstacle clearance surface have been authorized for a long time.
This restriction can usually be waived if the runway has a VGSI, as Runway 5 does here, but in this case, no waiver has been granted.
There is no penalty if the surface is penetrated by a lit obstacle, but if it is penetrated by an unlit obstacle, as in this case, it is not authorized for circling at night, unless the runway has a VGSI.
CDFAs can also be considered at Part 139 air-carrier airport runways with visual glideslope indicators (VGSI) where the VDA is no lower than the VGSI angle and is aligned within 10 degrees of the runway centerline.