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4 Answers

LOC/DME RWY 9 Houston-Southwest Airport (KAXH)

Asked by: 603 views , ,
Instrument Rating

In the center of the plate, just under the localizer 'arrow' symbol, the following information is provided:

(IAF) ROSEN IAH 33.4  DME 

What is the purpose for the DME distance from the IAH VOR if no radial is provided? The DME distance by itself does not determine the location of ROSEN.

 

2100 NoPT to DUCKS 044 deg. (1.6) and LOC (4.8)

What does '(1.6) and LOC (4.8)' mean? Is this notation explained somewhere in the AIMs?

 

*DUCKS 

What does the '*' in front of DUCKS mean?

Thanks

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4 Answers



  1. Wes Beard on Jan 06, 2017

    ROSEN can be found on the enroute chart. It is an IAF for the approach. 1.6 and 4.8 are ground distances for planning purposes. When you cross ROSEN fly heading 044 for 1.6 NM, intercept the localizer and in 4.8 NM will be the FAF, DUCKS.

    The front section of the chart booklet most likely has symbol definitions.

    The star in front if DUCKS indicates a note for that fix. In this case, “Maintain 3000 or above until established outbound for procedure turn.”

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  2. Charles22 on Jan 07, 2017

    Understood. Thanks a lot, Wes.

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  3. Russ Roslewski on Jan 07, 2017

    Wes’s answers are correct, but I’d like to go into a bit more detail on the first two.

    – ROSEN 33.4 DME – this is actually a strange one. Since it’s an enroute fix, the 33.4 DME notation is really not necessary. There are numerous examples of enroute fixes on instrument approaches where just the fix and name is depicted, not the fix makeup (radials or DME). You’re expected to get that from the enroute chart. But on this one, if you go to the enroute chart, there is the open arrow at the fix coming from the IAH VOR indicating it’s a DME fix, but no distance along the route is given – I suspect a charting error.

    – “2100 NoPT to DUCKS 044 deg. (1.6) and LOC (4.8)” this is called a Dead Reckoning leg. Although they are quite common, it’s very hard to find any official FAA reference to them (for example, in the AIM, IPH, etc.)

    I have written a short article about them on my blog at http://cfiruss.blogspot.com/2016/05/dead-reckoning-legs-on-instrument.html
    that should help explain them a little better.

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  4. Charles22 on Jan 07, 2017

    Thanks for the additional information, Russ.

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