PPRuNe Forums - VOR Questions

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Hey guys I am trying to make the connection between VOR's and Radials, by doing some practice questions. Maybe some of you can give me some insight.

1. VOR indicator in an aircraft is centered when 200 is selected in OBS. TO/FROM flag indicates TO. In order to intercept a radial 100 inbound at 90 degrees, the aircraft must turned to a heading of:

a. 010
b. 190
c. 020
d. 110

My answer: Radial inbound of 100 means you have to be on a heading of 280 correct. TO means the aircraft is flying towards the VOR. By drawing a diagram I got 190 (b) as the answer....

2. Heading of 140 and the VOR indicator needle is centered with a TO indication when 120 degrees is selected on the OBS. What heading should be steer to in zero wind conditions to intercept the 240 degree radial outbound from the VOR station at an angle of 45 degrees

a. 015
b. 195
c. 285
d. 105

3. When centering the needle on the VOR, the OBS indicates 080 degrees and the TO/FROM flag indicates TO. In order to intercept the 220 radial outbound from the station at an angle of 30 degrees, you have to turn to a heading of:

a. 250
b. 190
c. 070
d. 010

Thanks guys

1) 190
2) 195
3) 190

Damn, beat me to it......but in agreement with the answers....

My recommendation?
Draw on some scrap paper...:ok:

Guys, I am still not getting answers to 2 and 3.

Can you add some insight how you are getting to the answer...

All the problems can be solved in the same way. The best way to solve them has already been recommended. Draw a picture.

Firstly the heading of the aircraft is irrelevant. The position of the aircraft relative to the VOR is the key element. Remember, that radials are FROM a VOR, picture a bicycle wheel, with 360 spokes coming from the centre of the wheel, these are your radials.

For Q2, with a TO flag on the instrument, you always read the radial from the bottom of the instrument. With a FROM flag you always read the radial from the top. So in this case the aircraft is situated on the 300 degree radial, in other words to the north west of the VOR. To intercept the 240 radial the aircraft has to move south, and to cut the 240 radial by 45 degrees, the maths would be subtracting 45 from 240, i.e. 195 degrees as a heading. If you drew a picture it would be simple and logical. Q3 can be solved exactly the same way.

Hope that helps.

Thanks CAT3C AUTOLAND.
This helps......