DME Arc - Non-FAA way of teaching

Question 1

what is a DME arc?

Answer 1

a procedure in which an aircraft maintains a constant distance from a VOR/DME or VORTAC station while flying a curved path around it.

Question 2

What are the four steps in intercepting a DME arc?

Answer 2

1) Intercept the designated radial
2) Make a 90* turn
3) Turn 10 twist 10
4) Adjust

Question 3

How do you intercept the designated radial?

Answer 3

Fly outbound on that
radial until reaching the
DME distance required

Question 4

How do you make a 90* turn?

Answer 4

Make a 90*

right turn
approximately 1⁄2 mile
before reaching the DME
distance

Question 5

How do you turn 10 twist 10?

Answer 5

Turn the OBS needle 10*
in the direction you will be
flying

When the needle re-centers, turn it 10* further and make a 3 second standard rate turn

When the needle re-centers, do the same until reaching approximately 10* prior to the inbound course

Question 6

How do you adjust?

Answer 6

During the last part of the intercepting turn, monitor the DME closely. If it appears that you are overshooting the arc, continue past the originally planned roll out point.

If undershooting roll out of your turn early

Question 7

What flag indication do we operate under

Answer 7

with a “from” flag indication so that the radial is under the index at the top of the instrument

Question 8

How much airspace protection is afforded in a DME arc?

Answer 8

4nm but we will not deviate more than 1nm

Question 9

How do you know if you’re left or right of the desired groundtrack?

Answer 9

use the DME readout as you would a CDI to determine whether you’re left or right