FAR 71.13 — ATS Route Classification
FAR 71.13 classifies Air Traffic Service routes including jet routes, VOR Federal airways, colored airways, and RNAV routes. Study guide for pilot students.
FAR 71.13 organizes the Air Traffic Service (ATS) routes you'll fly in the National Airspace System into clear categories. Knowing these classifications matters because each route type has its own altitude structure, navigation requirements, and charting conventions you'll encounter on your sectionals, low/high enroute charts, and IFR flight plans.
Under Subpart A (high-altitude structure), ATS routes include:
- Jet routes — used at and above 18,000 feet MSL (Class A airspace).
- Area navigation (RNAV) routes — high-altitude RNAV routes (Q-routes).
Under Subpart E (low-altitude structure), ATS routes include:
- VOR Federal airways — the familiar Victor airways below 18,000 feet MSL.
- Colored Federal airways — Green, Amber, Red, and Blue airways (primarily used in Alaska, based on non-directional beacons).
- Area navigation (RNAV) routes — low-altitude RNAV routes (T-routes).
Understanding these categories helps you select the right chart, file the correct route type, and apply the appropriate equipment and altitude rules for your flight.
Five FAA-written-style questions. Instant explanations, every answer cites its source — no account needed.
You are flying VFR in Class E airspace at 8,500 feet MSL during the day. What are your minimum visibility and cloud clearance requirements?