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  #1  
Old 12-03-2018, 11:05 PM
rvdave rvdave is offline
 
Join Date: Jun 2005
Posts: 459
Default Chart question

Hey all, have a question regarding a local ils chart in my area with what looks like an acronym that I or no one I’ve asked has an explanation. It’s CFBTW on this ils approach into tvc. Any takers on an answer?



Link to larger version: https://flightaware.com/resources/ai...LOC+RWY+28/pdf
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Last edited by DeltaRomeo : 12-04-2018 at 03:29 PM.
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  #2  
Old 12-03-2018, 11:27 PM
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az_gila az_gila is offline
 
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A plain old fix?

http://www.fltplan.com/fix/CFBTW.htm
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  #3  
Old 12-03-2018, 11:41 PM
rvdave rvdave is offline
 
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Looks like then it is a fix and it?s use is CNF which means Computer Navigation Fix. What does that mean? I?m a new instrument trainee trying to learn something.
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  #4  
Old 12-04-2018, 07:24 AM
Cth6 Cth6 is offline
 
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Quote:
Originally Posted by rvdave View Post
Looks like then it is a fix and it?s use is CNF which means Computer Navigation Fix. What does that mean? I?m a new instrument trainee trying to learn something.
I have been flying instrument for some time and I had no idea. See this document for some government clarity. Maybe you will walk away with more clarity than I did. Basically it is just clutter unless you fly with a system that provides pilots situational awareness using CNFs.

https://www.faa.gov/about/office_org..._12-02-303.pdf
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  #5  
Old 12-04-2018, 07:51 AM
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Av8rRob Av8rRob is offline
 
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A Computer Navigation Fix (CNF) is also a point defined by a latitude/longitude coordinate and is required to support Performance−Based Navigation (PBN) operations. The GPS receiver uses CNFs in conjunction with waypoints to navigate from point to point. However, CNFs are not recognized by ATC. ? CNFs that do appear on aeronautical charts allow pilots increased situational awareness by identifying points in the aircraft database route of flight with points on the aeronautical chart. CNFs are random five-letter identifiers, not pronounceable like waypoints and placed in parenthesis. Eventually, all CNFs will begin with the letters ?CF? followed by three consonants (for example, CFWBG).
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  #6  
Old 12-04-2018, 08:46 AM
Dan B Dan B is offline
 
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The Aeronautical Information Manual is the source document for questions like this.

The AIM "is designed to provide the aviation community with basic flight information and ATC procedures for use in the National Airspace System (NAS) of the United States."

"This manual contains the fundamentals required in order to fly in the United States NAS."

Information on the Computer Nav Fix is located on page 1-1-26.
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  #7  
Old 12-04-2018, 12:34 PM
BlndRvtr BlndRvtr is offline
 
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As others have noted it is a Computer Navigational Fix. Basically useless to pilots. Maybe accessible in high-end FMSes, for the FMSes use.

Full explanation in the AIM Section 1-1-17 (5)(i)(2).

George
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  #8  
Old 12-04-2018, 11:27 PM
rocketman1988 rocketman1988 is offline
 
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Default FMS

Ha, "high end" FMS's. I got a chuckle out of that.

I fly into that airport fairly often for work. The "high end FMS" I get to use is in the B-717, and I have used that fix...

The chuckle is because virtually every RV with EFIS has a higher end system than the 717's...and the 717 has some of the better equipment...
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  #9  
Old 12-05-2018, 08:49 AM
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And here's the link: https://opennav.com/waypoint/US/CFBTW. The Internet is your friend.
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  #10  
Old 12-05-2018, 09:59 AM
Hwood Hwood is offline
 
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I thought it was a "Clutter Free Bell TWR"......
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