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12-03-2018, 10:05 PM
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Join Date: Jun 2005
Posts: 434
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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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Dave Ford
Cadillac, Mi
Last edited by DeltaRomeo : 12-04-2018 at 02:29 PM.
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12-03-2018, 10:27 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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12-03-2018, 10:41 PM
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Join Date: Jun 2005
Posts: 434
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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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Dave Ford
Cadillac, Mi
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12-04-2018, 06:24 AM
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Join Date: Apr 2017
Location: Central Florida
Posts: 91
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Quote:
Originally Posted by rvdave
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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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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12-04-2018, 06:51 AM
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Join Date: May 2005
Location: Rescue, CA. KROB
Posts: 352
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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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Rob Lasater
Rv-14 flying baby, yeah.
Paid Dec 2019
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12-04-2018, 07:46 AM
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Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
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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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Dan Burdette
Skyview, ADS-B, Garmin 420W, TT Gemini AP
RV-9A, IO-320, E-Mag
Guthrie-Edmond Rgnl, OK (KGOK)
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12-04-2018, 11:34 AM
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Join Date: Mar 2009
Location: NE Where
Posts: 339
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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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12-04-2018, 10:27 PM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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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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Bob
Aerospace Engineer '88
RV-10
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12-05-2018, 07:49 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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And here's the link: https://opennav.com/waypoint/US/CFBTW. The Internet is your friend. 
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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12-05-2018, 08:59 AM
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Join Date: Feb 2005
Location: Central Alabama
Posts: 303
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I thought it was a "Clutter Free Bell TWR"...... 
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Hwood 
N469SH / "Crazy Woman" (sold)
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