jetcareers - View Single Post - VDP. Why it isn't it depicted in all charts?

germb747 · February 8th, 2008, 09:14

I'm pretty sure they're only depicted if they're required to meet TERPS requirements.

You can use the memory aid GuS wears a HAT to calculate your own:

HAT
----
GS

where HAT is Height Above Touchdown and GS is desired glidepath, usually 3 degrees, or 300 in this formula. The resulting number is distance from the runway you want to start down; you have to look at what's on the chart to convert that to a meaningful DME. If the procedure is based on timing, there's a formula for that too but I don't recall what it is off the top of my head.

February 8th, 2008, 09:14	#3
germb747 Senior Member Join Date: Jan 2008 Location: San Antonio Posts: 424	Re: VDP. Why it isn't it depicted in all charts? I'm pretty sure they're only depicted if they're required to meet TERPS requirements. You can use the memory aid GuS wears a HAT to calculate your own: HAT ---- GS where HAT is Height Above Touchdown and GS is desired glidepath, usually 3 degrees, or 300 in this formula. The resulting number is distance from the runway you want to start down; you have to look at what's on the chart to convert that to a meaningful DME. If the procedure is based on timing, there's a formula for that too but I don't recall what it is off the top of my head.