An Intergovernmental
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City of Prospect Heights &
the Village of Wheeling

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February 20, 2017, 9:20 am
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current pressure: 30 in
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Class B: Inside or Out, Be Aware of Invisible Lines in the Sky

Class B airspace is a three-dimensional sculpture defined by invisible lines of altitudes and radial distances from the airport that anchors this funnel of protected airspace to the ground. In our case, that’s Chicago O’Hare International. Before the advent of moving map technology that, if enabled, makes these boundaries visible, pilots had to keep close track of their position relative to them. Apparently, technology has not solved the Class B incursion and excursion problem. If it had, would the FAA have issued a Safety Alert for Operators (SAFO 17001) dedicated to this issue?

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