LO­CAL­IZ­ERS REP­RE­SENT SIM­PLE YET VALU­ABLE AP­PROACH AL­TER­NA­TIVES

Flying - - Training & Technique -

Localizer-only ap­proaches have been around for decades, pro­vid­ing bet­ter-than-vor lat­eral guid­ance while de­mand­ing no spe­cial cock­pit avion­ics ex­cept the stan­dard VOR-ILS in­di­ca­tor com­mon to most air­planes. When it comes to ac­cu­racy, full-scale de­flec­tion of the course-de­vi­a­tion in­di­ca­tor from the cen­ter on a VOR sig­nal rep­re­sents 12 de­grees off course, while a sim­i­lar de­flec­tion on the nar­rower localizer sig­nal rep­re­sents be­tween 3 and 6 de­grees from the cen­ter po­si­tion. The lim­i­ta­tion of a localizer ap­proach, how­ever, is that it does not pro­vide ver­ti­cal guid­ance to the run­way like a full ILS and is hence con­sid­ered a non-pre­ci­sion ap­proach.

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