VFR weather minimums by airspace class
14 CFR 91.155 establishes the minimum visibility and cloud clearance requirements for VFR flight. These vary by airspace class and altitude — memorizing the table is essential for every pilot:
Class A (18,000 MSL to FL600): VFR is not permitted. All operations in Class A are IFR.
Class B: 3 statute miles visibility, clear of clouds. The clear-of-clouds requirement (rather than specific distance from clouds) is possible because ATC provides separation between all aircraft in Class B.
Class C: 3 statute miles visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Class D: 3 statute miles visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Class E (above 10,000 MSL): 5 statute miles visibility; 1,000 feet below, 1,000 feet above, 1 statute mile horizontal from clouds. The increased requirements above 10,000 feet reflect higher aircraft speeds at those altitudes.
Class E (below 10,000 MSL): 3 statute miles visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Class G (below 1,200 AGL, day): 1 statute mile visibility, clear of clouds. This is the most permissive VFR environment.
Class G (below 1,200 AGL, night): 3 statute miles visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Class G (above 1,200 AGL but below 10,000 MSL, day): 1 statute mile visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Class G (above 1,200 AGL but below 10,000 MSL, night): 3 statute miles visibility; 500 feet below, 1,000 feet above, 2,000 feet horizontal from clouds.
Required VFR equipment — 14 CFR 91.205
14 CFR 91.205(b) specifies the minimum instruments and equipment required for VFR day flight. The traditional mnemonic ATOMATOFLAMES helps remember the list:
- A — Airspeed indicator
- T — Tachometer (for each engine)
- O — Oil pressure gauge (for each engine using a pressure system)
- M — Magnetic direction indicator (compass)
- A — Altimeter
- T — Temperature gauge (for each liquid-cooled engine)
- O — Oil temperature gauge (for each air-cooled engine)
- F — Fuel gauge (for each tank)
- L — Landing gear position indicator (if retractable)
- A — Anti-collision lights (for aircraft certificated after March 11, 1996)
- M — Manifold pressure gauge (for each altitude engine)
- E — ELT (emergency locator transmitter)
- S — Seatbelts (and shoulder harness for each front seat for aircraft manufactured after 1978)
For VFR night flight, 91.205(c) adds: position lights (nav lights), an anti-collision light system (typically a rotating beacon or strobes), a landing light if the aircraft is operated for hire, an adequate power source for all electrical and radio equipment, and spare fuses (if the aircraft uses fuse-type circuit protection).
VFR flight plans — optional but recommended
Unlike IFR flight plans, VFR flight plans are not required by regulation (except when crossing the US ADIZ or entering certain airspace). However, filing a VFR flight plan provides a critical safety net: search and rescue notification.
When you file and activate a VFR flight plan, Flight Service expects you to close it upon arrival. If you do not close the plan within 30 minutes of your ETA, Flight Service begins alerting procedures that can initiate a search and rescue operation. Without a flight plan, no one may notice you are missing until someone on the ground wonders where you are.
Filing is simple: use 1800wxbrief.com (Leidos Flight Service online portal), call 1-800-WX-BRIEF, or use an EFB application. Provide your aircraft identification, type, departure point, route, altitude, destination, estimated time en route, fuel on board, and contact information.
Remember: a VFR flight plan does not provide ATC separation or radar services. For radar services, request VFR flight following (radar advisories) from the appropriate approach or center frequency. You can have both a VFR flight plan and flight following simultaneously.
Pilotage and dead reckoning
Even with GPS and moving maps, the FAA expects VFR pilots to be proficient in pilotage (navigating by visual reference to landmarks) and dead reckoning (navigating by computing heading, groundspeed, and time from a known position).
Pilotage relies on identifying landmarks on the sectional chart and matching them to what you see outside the aircraft. Effective landmarks include: major highway intersections, rivers and lakes, towns, airports, railroad tracks, power lines, and prominent terrain features. Sectional charts depict these features using standard symbology. Practice reading the chart and identifying features before you fly — in-flight is not the time to learn chart symbology.
Dead reckoning uses the wind triangle to calculate the heading and groundspeed needed to maintain a desired course. Using forecast winds from the weather briefing, compute the wind correction angle (WCA) and apply it to your true course to get the true heading. Convert true heading to magnetic heading using the local variation, then to compass heading using the compass deviation card. Calculate groundspeed to determine estimated times between checkpoints.
In practice, pilots use a combination of pilotage and dead reckoning. Dead reckoning gets you close to the course line; pilotage confirms your position using visual landmarks. GPS provides the same information electronically, but knowing the manual methods means you are never lost if the electronics fail.
VFR cross-country planning checklist
A thorough VFR cross-country plan covers every element the PIC needs for a safe flight. Use this checklist as your standard workflow:
1. Route selection: Plot the course on a current sectional chart. Identify the magnetic course for each leg. Select a cruising altitude appropriate for the direction of flight (91.159 hemispheric rule above 3,000 AGL), terrain clearance, and weather conditions.
2. Weather briefing: Obtain a standard weather briefing from 1800wxbrief.com or by calling 1-800-WX-BRIEF. Review the synopsis, current conditions (METARs), forecasts (TAFs), winds aloft, AIRMETs, SIGMETs, and PIREPs along your route. Make your go/no-go decision based on your personal minimums, not the regulatory minimums.
3. NOTAMs: Check NOTAMs for departure, destination, alternate, and en route airports. Pay attention to runway closures, navaid outages, TFRs, and airspace changes.
4. Weight and balance:Calculate W&B for the planned loading. Verify total weight is within limits and CG is within the envelope for both takeoff and landing conditions.
5. Performance: Using the POH performance charts, verify takeoff distance, climb rate, cruise performance, and landing distance for the expected conditions (temperature, altitude, wind, runway surface).
6. Fuel planning: Calculate total fuel required including taxi, climb, cruise at the planned burn rate with forecast winds, descent, and reserves per 91.151. Compare to the fuel onboard.
7. Navigation log: Complete a nav log with checkpoints every 10-20 miles, magnetic headings, estimated groundspeed, and estimated times for each leg. This is your primary tool for dead reckoning and position tracking.
Special VFR operations
Special VFR (SVFR) allows operations within the lateral boundaries of certain surface-area airspace (Class B, C, D, and surface Class E) when weather is below basic VFR minimums. SVFR requires ATC clearance and a minimum of 1 statute mile flight visibility and the ability to remain clear of clouds.
SVFR at night requires the pilot to be instrument rated and the aircraft to be instrument equipped. This is because the reduced visibility and proximity to clouds at night create a significant risk of spatial disorientation.
Some airports prohibit SVFR operations entirely — these are listed in 14 CFR Part 91 Appendix D and are marked on sectional charts with "NO SVFR" above the airport data. All major Class B airports restrict SVFR due to the volume and complexity of traffic.
SVFR is a useful tool when weather is marginal at an airport but improving nearby, or when a thin layer prevents meeting basic VFR cloud clearance requirements. It is not a substitute for an instrument rating when flying in actual instrument conditions — SVFR requires the pilot to maintain visual reference to the ground at all times.