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No lead?


I enjoyed your article concerning DME arcs and lead radials ("Leading the Turns," August 2008 IFR). On that matter, I have a question concerning the ILS or LOC Rwy 2 approach at Chattanooga, Tenn., (KCHA), specifically the DME arc.

A lead radial is published when inbound on the arc from HOGIR; however, there is not a published lead radial when transitioning to the localizer from ZIROB. Any thoughts why?

I enjoy using this approach with my students in FTD simulation. The lack of a published lead radial when transitioning from Z/ROB makes them correlate information to determine when they should begin a turn to intercept the localizer.

Because of the proximity of the VOR to the airport, it may be easy to assume that an appropriate lead radial may be a couple radials shy of the reciprocal to the localizer course. That assumption will cause problems.

The VOR radial identifying QUIDS is a good hint as to what the lead radial may be, but it is puzzling to me why a lead radial is not published when arcing west.

Paul Marocchi

Daytona Beach, Fla.

The intercept angle when arriving from ZIROB is too low (75 degrees at QUIDS) to require a published lead radial. That's not to say you can't turn early, just that you can turn when the localizer needle comes alive and not overshoot, even at relatively high speed.

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Title Annotation:READBACK
Author:Marocchi, Paul
Article Type:Letter to the editor
Date:Jan 1, 2009
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