Descending in an ARC
 

I would appreciate any advise or info on how to descend on an arc 10 and 12nm. I was shown it many years ago but can not remember.
Calculation of track miles and and time on the arc things like that.

Regards

CF:)

From the 1:60 rule;
On a 12nm arc, every 5 degrees is one mile. So assuming you have to fly 25 degrees of an arc before intercepting the inbound course, that would equate to 5 track miles. So you have 5nm on the arc + 12nm inbound = 17nm. So as you enter the arc you want to be around 17 x 300 = 5100ft AGL (approx.). Now you can project this point backwards to find your TOD.

For a 10nm arc just do the same thing with 6 degrees = 1nm.