IFR.2.8 DME ARCS

Question 1

What’s the margin of an DME ARC based on ICAO Doc 8168?

Answer 1

0.5 NM per side

Question 2

What are DME arcs?

What instruments can we use to do DME Arcs?

What do we always need to have?

Answer 2

DME arcs are a navigation around a VOR/DME or NDB/DME with an X separation from the VOR/DME or NDB/DME indicator

RMI or HSI

DME indicator

Question 3

How do you get the distance from the navaid ir order to make an anticipation to intercept the arc?

Answer 3

DISTANCE IN MILES = 0.5% of Ground Speed (GS)

Question 4

What do we do once we have the anticipation distance?

Answer 4

Determine if the ARC will be:

• At higher radials QDM
• At lower radials or QDM from the navaid

Question 5

What if the arc will be to lower radials? (flying decreasing radials)

Answer 5

The turn will always be to the right

Question 6

What if the arc will be to higher radials? (flying increasing radials)

Answer 6

The first turn will always be to the left

Question 7

How is the first turn on an DME ARC? what do we normally check?

Answer 7

90º left or right, and we check every 10 radials with our HSI

Question 8

How is the procedure done?

Answer 8

1 Calculate anticipation

2 Reach the point to start the turn, and turn 90º left or right (depending of what we have to fly; increasing or decreasing radials)

3 After having completed the turn, move Course Selector on the HSI 10º (more/less), depending of what we are flying, majors or minors

4 Keep this heading until CDI is centered, and repeat this procedure until we leave the ARC

Question 9

With what will you check your DME distance?

Answer 9

with DME indicator

Question 10

What is the formula to calculate the anticipation to Leave our DME ARC?

Answer 10

Radials anticipation = 3 x GS / 10 x DME Distance