Dear simmers, maybe a basic question for some of you, but i am looking for an answer in order to manage certain approaches. Below you can see a screenshot of the RNAV approach to RWY 02 MHGT. When reaching TG015 i must be at 7.000 feets and start right away a descent of a 3.5 glide path.
If i want to descent manually by selecting VS in the autopilot, which vertical speed should i select when reaching TG015 in order to follow the approach to the runway?
Thanks for your help and information 
At what speed?
The general rule of thumb for 3 degree glides is 100fpm for every 18 knots of ground speed.
If you want 3.5 degrees, just tack on an extra 1/6th, (so if your ideal descent rate for a 3 degree glide is 600fpm, make it 700 for 3.5 degrees)
The little table in the bottom of the chart is your guide. If you are traveling at 90kts then your VS should be -557.
As others have said youre looking for around 700FPM
What I’ll add to that is to use small precise corrections. If for example you’re just a little below the slope reduce the descent (watch your power, airspeed) capture it again and keep going down the slope.
Exact calculation would be:
V_kn * (115750/1143) * tan( glide_path_degrees )
Example:
130 kn * (115750/1143) * tan( 3.0° ) = 689.9441 fpm
In general for a 3° glide path the rule of thumb is speed in knots * 5. In the above case you would end with 650 fpm.
A handy app to keep open in the background if an approach plate is unavailable:
Thank you so much guys! I think I have now the tool and information needed for a successful approach!
Uh…I was told there would be no math 
They lied .
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