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Briefing January 2016 Issue

IFR Airport Basics

IFR Airport Basics

Instrument procedures keep you clear of obstacles. To do that, they depend on a lot of infrastructure we often donít think about. But we need to be aware of the limitations.

Recently, a reader asked about a puzzling approach at Chatham, MA (KCQX). The RNAV (GPS)-B is perfectly aligned with Runway 24 and the descent angle is a routine 3.05 degrees, yet it has only circling minimums. Approaches most often just have circling minimums if the alignment to the runway exceeds 30 degrees (for most procedure types) or the descent angle is greater than 3.77 degrees (for Category C and below). So, whatís up at Chatham?

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