Welcome Guest. Sign in or Signup

1 Answers

Instrument Approach Feeder Question

Asked by: 2207 views FAA Regulations, Instrument Rating

Looking at different approaches, I found the ILS DME 2 RWY 8 at MMVA and had a question regarding it. The approach can be found here ivaomex.com/cartas/MMVA.pdf  If you are flying on V23 SE bound and cleared for the approach, upon reaching 15 DME it appears you make a turn to a heading (track?) of 142 degrees to intercept final. My question is: assuming you have no GPS, do you just fly the heading since there is nothing to track? What about with wind?

1 Answers



  1. Russ Roslewski on Jun 20, 2016

    This is called a DR (“Dead Reckoning”) leg and yes, you just fly a heading until intercepting the final approach course. Possible wind effects are accounted for, but if I had a GPS on board, realistically I’d just fly a “track” of 142 instead of just a heading.

    I wrote a short article about them at:

    http://cfiruss.blogspot.com/2016/05/dead-reckoning-legs-on-instrument.html

    Note that I use U.S. examples and the U.S. government approach charts, but the charting is similar to Jeppesen and I believe the concept of the DR leg is similar in Mexico (though I am willing to be proven wrong).

    +1 Votes Thumb up 1 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.