Question on a VOR approach

[rickyrhodesii]

I'm not an instrument rated pilot, but i have a few questions regarding a VOR approach (linked below). Say you're performing the VOR 17 with the procedure turn, how many VOR indicators are you using? Do you use two indicators? One for the outbound leg and one for the inbound leg...or do you use one VOR indicator and you just set the new radial once you're on the 212 heading on the procedure turn?

http://www.avn.faa.gov/d-tpp/0601/00136V17.PDF

Thanks!

 

[BrettInLJ]

I'm not an instrument rated pilot, but i have a few questions regarding a VOR approach (linked below). Say you're performing the VOR 17 with the procedure turn, how many VOR indicators are you using? Do you use two indicators? One for the outbound leg and one for the inbound leg...or do you use one VOR indicator and you just set the new radial once you're on the 212 heading on the procedure turn?

http://www.avn.faa.gov/d-tpp/0601/00136V17.PDF

Thanks!

The answer is either, but if you do not have a DME, you may want to have the #2 set to one of the cross radials already to identify that MAP, and just twist the CDI on #1 180 degrees when outbound on the procedure turn.

 

[Alchemy]

You typically just use one VOR indicator. In this case, you would twist the OBS knob from 347 to 167 once you began the proecure turn. If you have two VHF Nav radios, it's a good practice to use both and crosscheck the two course needles.

 

[MidlifeFlyer]

I think that most pilots would do (and most CFIIs would teach) a combination of the prior two answers in an airplane equipped with two VORs:

Use one VOR to navigate the PT, turning the OBS from 347 to 167 during the 45 degree portion of the turn.

Use the second VOR to cross-check position. That could be three different things in the context of this particular approach:

1. Tuning it to ODG and the same OBS setting as Nav 1 (as Alchemy suggests)
2. Tuning it to ODG but setting the OBS 90 degrees off as a crosscheck and more obvious indicator of station passage than the To/From flag (I typically do that in VOR holds)
3. Tuning it to the Pioneer R-288 as a cross-check on the MAP, as Brett suggests.

For this approach I'd choose #3.

 

[aloft]

On an approach like the one you linked to, you only need one CDI. If you have a second one, you can use it to identify cross-radials to aid identification of the MAP, or you can just set both to the inbound course to add some redundancy. I don't know if I'd bother with setting the radial for the outbound leg then spin the OBS for the inbound leg during the PT; I'd probably just set the final approach course before initating the approach.

Great idea of setting the 2nd OBS 90 degrees off...I'll have to try that.