preferred IFR routes

preferred IFR routes

Routes established between busier airports to increase system efficiency and capacity. IFR (instrument flight rules) clearances are issued on the basis of such routes except when severe weather avoidance procedures or other factors dictate otherwise. Preferred IFR routes are correlated with SID (standard instrument departures) and STAR (standard terminal arrivals) and may be defined by airways, high-level airways, direct routes between NAVAIDs (navigational aids) or waypoints, radials, DME (distance-measuring equipment) fixes, or any combination of these.
References in periodicals archive ?
I learned this in a letter from an FAA manager covering the decommissioning of LHY and the establishment of LAAYK, its T-routes and preferred IFR routes, that's on the Teterboro Users Group web site.
For a while, I approached the determination of preferred IFR routes as if it were a black box.
What little guidance the FAA provides on selecting routes comes in the form of the Preferred IFR Routes and Tower En Route Control routes found in the A/FD, and the National Flight Data Center Preferred Routes Online Database (http://www.
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