Welcome Guest. Sign in or Signup

1 Answers

What does this symbol mean?

Asked by: 2886 views Airspace, Instrument Rating

I was in flight review and the question of what is the magenta line running from FIS to MTH on the Miami sectional; B 646.  Since it ran from a NBD, my answer was an LMF Airway.  

The answer was it is a Miscellaneous Air Route.  Of course the legend for Miami section is of no help.  The FAA Aeronautical Chart gets me close, but really doesn't reference any line starting with the letter B or G for that matter.  

I know it is a bit of 'potatoe' / 'potato' topic, but now just really curious.

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

1 Answers

  1. Best Answer


    JCBaum on Feb 19, 2018

    B646, or Blue 646, is a Low/Medium Frequency (L/MF) airway using NDBs, which allows IFR operations, with a MEA of 2,000. Using VOR nav and flying airway V3, you would be well over water, and face a initial MEA of 15,000 to avoid the radar balloon (R2916). The kink in B646 keeps you well clear of the radar balloon. A better example of a “Miscellaneous Airway” might be AR-5 (Atlantic Route 5) off of the NDB JA, near KJAX, which leads you out into the Atlantic and just end at Longitude W77.000. If you look in the FAA VFR Chart User’s Guide, page 28, you’ll see the various airway designators.

    Also, gotta consider your routing when the intersection where V3 turn north is named “DROWN”!

    +3 Votes Thumb up 3 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.