from the "book"
To set a VOR frequency of 110.5 via TACAN, look at the chart in the appendix for a list of TACAN
channel frequencies. You will see that 110.50 equals a TACAN channel of ‘42X’. Begin by setting the
UFC in TCN mode. Press 4-2-ENTER on the UFC keypad and then select ‘X’ by pressing the little
button to the left of the ‘X’ display. It should become active with a ‘ : ’ symbol.
If you want to set the VOR frequency of 110.5 manually, just press 1-1-0-5-0-ENTER and it will
automatically translate the frequency into the appropriate TACAN channel if you enter a
recognized frequency. If you are having difficulty, try entering 5 full digits instead of 3 or 4.
To set course, you need to use the CRS knob close to the Fuel indicator in the lower left of the
cockpit. It can be scrolled with the mouse wheel. To check the CRS, open the HSI screen on one of
the displays and look at the CRS readout.
I use it all the time!!!