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.
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.
|Printer friendly Cite/link Email Feedback|
|Article Type:||Letter to the editor|
|Date:||Jan 1, 2009|
|Previous Article:||I like DUAT, thank you.|
|Next Article:||Welcome to ATC 101: like an ROTC program for an FAA career, tomorrow's top controllers and future supervisors are learning the basics in college.|