Regarding A320 landing gear down operation
 

Recently, a young dispatch guy approached me with a strange looking chart
of which title says
“EN ROUTE NET FLIGHT PATH-L/G DOWN-ONE ENGINE OUT”.
The problem is that he and I could not figure out how to read the chart.
Help, please.
please refer to “PRO-NOR-SUP-LG-LG_DN P 26/30”.

IINM, this chart is to be used only in case of dispatch with LG down.

How to read it?

First of all, turn it by 90 degrees. Then you get a set of curves, each for a given initial weight.

These curves show altitude vs distance, ie. flight profile, both for descent and climb. Your net flight path has to clear the terrain en-route by, IIRC 2000 ft

https://scontent-icn1-1.xx.fbcdn.net...61&oe=5A7FAC02


Thanks for reply.
To make my muddled brain a bit clearer...


If I start with 110,000 lbs and follow the dashed line--it looks like dashed lines represent weight--until I meet a set of three? diverging curves.
Upward sloping curve the middle curve, and downward sloping curve.
From here, I get stuck.
What information can I deduce from the three curves for a given weight value?

No, its a bit different.

If you want to see your engine-out climb profile after t/o at 110klbs, you start at 110 000 at the bottom and follow the solid line from zero, to the common part of the curve and then along the common part.

If you want to see your drift down profile from altitude, you start at the top and follow the solid line down to the common part. Then, as your plane gets lighter due to fuel burnoff, it will follow the common part of the curve and climb.

What you need to ensure is that your terrain and/or obstacles are always below the curve.

https://scontent-icn1-1.xx.fbcdn.net...eb&oe=5A8534ED


Thank you so much.
Now, I get it.
One more hurdle cleared.