Non-Towered Airport Operations: Procedures, Traffic Patterns, and CTAF: Part I

There is an unbelievable contrast in numbers between towered and non-towered (commonly referred to as “uncontrolled”) airports in the United States. At last count, there were somewhere in the ballpark of ~500 towered (Class B, C, or D) airports in the U.S. For reference, there are over 5,000 public-use airports, and there are over 20,000 private, private-use, and otherwise small airports or airparks that rely on CTAF as the sole source of comms and control. 

With proper training and conduct, non-towered airports are not inherently a dangerous operating environment. We’re going to look at the factors that lead to incidents at these airports, the training available to prevent them, and procedures to help avoid miscues and miscommunications.

Why “Uncontrolled” Is a Misleading Term

Calling any of these airports uncontrolled is a misleading term because very little of the airspace in the U.S. is actually uncontrolled. There are a few Class G airports where the surface area is uncontrolled, but Class G terminates at either 700’ or 1,200’ AGL and transitions to controlled Class E. But this is hardly an “uncontrolled” airport, since the entire traffic pattern is in controlled airspace. 

Also, these airports are usually in rural areas, where the risk of incidents is relatively low due to low traffic density. 

Now, what does this mean for you, the pilot? It does not mean there are no regulations, nor that ATC does not exist or does not apply in those areas. In Class Echo, ATC very much applies; just because no separation is provided by ATC does not mean ATC is not in control. And those areas that are Class G? Well, most pilots aren’t hanging around in that 700’ AGL or even 1,200’ AGL window for very long. 

How Many Airports Are Non-Towered?

The vast majority of public airports are untowered, and all private airports and airparks are, too. This is very common, and the ratio is roughly 10-to-1 non-towered to towered. This is for fairly obvious reasons: towered airports cost a lot more to operate, and they also make airspace matters more complex. 

The main reason why an airport has a tower is traffic density; if the airport does not meet the criteria, then the juice is not worth the squeeze, so to speak. While there is no set traffic density that requires an airport, some of the busiest non-towered airports peak at nearly six figures annually! Those numbers are wild, breaking down to nearly 300 operations per day.

For a very basic idea of the ratio between towered and non-towered, take a quick look at the San Antonio sectional in the Waco area of Central Texas.

FAA Guidance Sources for Non-Towered Operations

As we know, with everything in aviation, it’s probably one of, if not the most, regulated transportation industries in the world. Your duty is to learn the applicable regulations, procedures, and best practices for safe operations at non-towered airports. 

Federal Aviation Regulations (FAR)

Title 14 CFR § 91.126 is the federal regulation that governs operations on or in the immediate vicinity of an airport in Class G airspace? This requires left turns unless otherwise authorized, in compliance with right-of-way rules to prevent conflicts. This regulation is mandatory and prioritizes vigilance in aircraft separation. 

Aeronautical Information Manual (AIM)

A Staple of all pilot training programs, the AIM is a go-to guide for common flight operations, including traffic patterns, visual indicators like segmented circles and windsocks, and self-announced practices on the common traffic advisory frequency (CTAF).

Chapter 4, Section 3 details all of these basic things and stresses that it is the pilot’s responsibility to remain alert for traffic, to operate in standard left-hand traffic patterns unless right-hand patterns are indicated by an RP on the sectional, and to follow communication protocols at non-towered fields.

Advisory Circular 90-66C (Non-Towered Airport Flight Operations)

Advisory Circular 90-66C was issued on June 6, 2023. This offers recommended traffic patterns, commonly accepted phraseology, and standard procedures for aircraft, rotorcraft, gliders, and ultralights operating at non-towered or part-time towered airports.

This regulation highlights pre-flight planning, the use of charts, and the avoidance of straight-in approaches when traffic is present. It also provides guidance on coordinating via CTAF, which is the key practice for mitigating mid-air collision risk.

It is important to remember that radios are not actually required for operation at non-towered airfields and airports. You may be operating in mixed airspace with aircraft, especially ultralights, if they operate in the area, which has no electrical systems and no radios.

Pilot’s Handbook of Aeronautical Knowledge (Airport Operations chapter)

Another staple of all common pilot training programs, the Pilot’s Handbook of Aeronautical Knowledge covers standard airport operations, markings, traffic patterns, and procedures for both towered and non-towered environments. These are found in Chapter 14 of the Pilot’s Handbook of Aeronautical Knowledge. It also goes in depth into visual aids right away, how pilots should appropriately enter the traffic patterns at 1,000 ft agl, and how to scan for conflicts. 

Why Traffic Pattern Discipline Matters at Non-Towered Airports

Flying VFR to a non-towered airport is fun, but it also requires a heightened sense of awareness of your surroundings. All separations are provided between pilots, requiring them to follow the standard procedures and protocols listed in the references above. 

It is completely up to you to be as safe as possible in the non-towered environment. You cannot count on other pilots to operate as they should, so you must know the proper protocols, airport patterns, signs and markings, airport lighting, and all other procedures. Don’t ever count on anyone to be safe, to follow radio calls (or even use them), or basically do what you are supposed to do in the pattern and aerodrome environment. 

Common Causes of Close Calls

Just like common mechanical defects in your aircraft, there are common causes of close calls, incidents, and even accidents.

One of the worst causes of close calls is attempting straight-in visual approaches that conflict with the traffic pattern. Entering the traffic pattern should be done in accordance with the above guidance and the preferred method. For a visual entry, it is not a straight-in approach. A straight-in approach, being non-standard, means that conflicting traffic is not expecting you to be there. 

According to the Pilot’s Handbook of Aeronautical Knowledge, chapter 16, the following procedures should be used:

“Nontowered airport traffic patterns are always entered at pattern altitude. How you enter the pattern depends upon the direction of arrival. The preferred method for entering from the downwind side of the pattern is to approach the pattern on a course 45 degrees to the downwind leg and join the pattern at midfield.” 

Facility at Airport	Frequency Use	Outbound	Inbound	Practice Instrument Approach
UNICOM (no tower or FSS)	Communicate with UNICOM station on published CTAF frequency (122.7, 122.8, 122.725, 122.975, or 123.0). If unable to contact the UNICOM station, use self-announce procedures on CTAF.	Before taxiing and before taxiing on the runway for departure.	10 miles out. Entering downwind, base, and final. Leaving the runway.	(none)
No tower, FSS, or UNICOM	Self-announce on MULTICOM frequency 122.9.	Before taxiing and before taxiing on the runway for departure.	10 miles out. Entering downwind, base, and final. Leaving the runway.	Departing final approach fix (name) or on final approach segment inbound.
No tower in operation, FSS open	Communicate with FSS on CTAF frequency.	Before taxiing and before taxiing on the runway for departure.	10 miles out. Entering downwind, base, and final. Leaving the runway.	Approach completed/terminated.
FSS closed (no tower)	Self-announce on CTAF.	Before taxiing and before taxiing on the runway for departure.	10 miles out. Entering downwind, base, and final. Leaving the runway.	(none)
The tower or FSS not in operation	Self-announce on CTAF.	Before taxiing and before taxiing on the runway for departure.	10 miles out. Entering downwind, base, and final. Leaving the runway.	(none)

 

Failure to follow established procedures is one of the most common causes of conflict in a non-towered airport environment. If all pilots followed all of the reference links in this article, there would be very few conflicts. Deviations from standards are what cause problems. 

The Traffic Pattern Is Not the Place for Conflict

The traffic pattern is never the place for conflict. Conduct yourselves professionally. Do not argue on the CTAF and focus on your safety. If you get cut off, create space and separation from the offending pilot. You can do with them on the ground or contact the FAA and let them deal with the pilot. Safety is your primary objective, so fly accordingly. 

FAA Traffic Pattern Rules and Legal Requirements

I am sure that all of you are familiar with the big sky concept: there is a very big sky, and your airplane is a very small dot in it. This is largely true when you’re en route, especially flying VFR at levels where commercial aircraft don’t fly; however, the airport environment is the absolute exception to this rule. The sky suddenly becomes a whole lot smaller. Following established traffic pattern rules is absolutely key to your safety and everyone else’s. 

FAR 91.126 – Class G Airspace Operations

The standard traffic pattern is a left-turn racetrack pattern. Unless the airport display is approved markings or publications specify a right-hand pattern. Pilots must comply with published pattern direction and with airport traffic pattern indicators. This is a deviation from flying in controlled airports, as you can request from ATC to fly a right-hand pattern for practice purposes. The tower can always deny this, but they usually won’t unless there’s a real reason to. For non-towered airports, you are obligated to follow the published traffic patterns.

There are some exceptions. For instance, at the airport I used to manage, KFLV, or Sherman Army Airfield, there is substantial terrain just to the west of the airfield. For runway 34, the standard traffic pattern was to the east (right-hand), whereas runway 16 used a standard left-hand pattern. 

FAR 91.127 – Class E Airspace in Vicinity of Airports

While operating Class E airspace near an airport, pilots are obligated to comply with published traffic patterns and published communications requirements, and any ATC instructions that are applicable to that airport. Just because it doesn’t have a control tower doesn’t mean the ATC doesn’t reign supreme.

Standard traffic pattern procedures, which include directions of turns and pattern entry, apply unless otherwise specified by ATC or are laid out in the airport facility directory.

Pilots must maintain appropriate radio comms with the controlling facility when required and follow sequencing instructions when no control tower is operating. Pilots use CTAF procedures and self-announce to coordinate pattern entry, sequencing, and departure. This is a common feature of untowered airports after hours. 

FAR 91.113 – Right-of-Way Rules

Now, let’s talk about right away: who has it? Aircraft on final approach to land or in the process of landing have the right-of-way over other aircraft in flight or operating on the surface. However, pilots on final may use this right away or may not use this right away to cut in front of or overtake another aircraft already established on final. 

Generally speaking, when two or more aircraft are approaching an airport for landing, the aircraft at the lower altitude has the right of way. However, this does not permit pilots to descend in a way that creates a hazard (i.e., to dive below another aircraft to gain priority for landing). 

Special Considerations

There are some circumstances that warrant special considerations. Airports blend all kinds of traffic. 

Helicopters typically operate at lower pattern altitudes, which will be designated on charts or facility directories, and may use separate arrival and departure routes to avoid fixed-wing traffic. Helicopter pilots are still obligated to avoid creating hazards to fixed-wing aircraft and should not overfly other aircraft and patterns at low altitude. 

Turboprop aircraft and other high-performance piston aircraft may use high patterns, speeds, and adjusted pattern altitudes, consistent with the manufacturer’s guidance and local procedures. These aircraft must still fit safely in established traffic flows and avoid overtaking or cutting off slower aircraft in the pattern. It is not unusual for them to extend a downwind, which they will use to create spacing. 

Standard Traffic Pattern Altitudes and Speeds

Traffic patterns are built to contain traffic to predictable patterns where other pilots can easily identify and locate them quickly. To do this, standard altitudes and airspeeds are adopted so all pilots are on the same page and can predict sequencing. 

 

Aircraft Type	Recommended Altitude	Source Notes
Light propeller-driven aircraft (singles, fixed gear)	1,000 feet AGL	FAA AIM standard unless published otherwise in the Chart Supplement. faa+1
Large/turbine-powered aircraft	1,500 feet AGL or 500 feet above the established pattern	Enter no lower than 1,500 feet AGL to maintain separation. faa+1
Military turbojet operations	Up to 2,500 feet AGL	Often higher at military bases; check local procedures. faa+1
Ultralight vehicles	500 feet below powered aircraft pattern (typically 500 feet AGL)	Segregate from fixed-wing traffic per AC 103-6. faa+1

Recommended Pattern Speeds

There is only one hard-and-fast regulatory speed rule: 200 knots in the traffic pattern, required per Title 14 of the CFR Part 91. That said, pattern speeds are generally governed by the aircraft’s performance envelope. These will fall in the range of 70 to 80 knots for fixed-gear singles and 80 to 90 knots for retractables and high-performance. Again, these are just guidelines, not regulations, because you couldn’t do that, given that performance varies so much from one aircraft to the next. 

This is where following standard traffic pattern procedures is so important, because air speeds will not be the same unless you have a pattern full of identical aircraft, which is almost never the case. You might have a turbine-powered crop duster, a turbine helicopter, and a Cessna 172 at the same time. 

But by knowing where to look and by using established altitudes and traffic patterns, pilots will know exactly where to look and how to deconflict in terms of speed. Of course, if there is a high-performance aircraft on a downwind that’s going to conflict, they can always break off and hold. 

Parting Thoughts

This is Part I of a two-part series on operating safely in non-towered, or “uncontrolled” airports. Part II will be posted next week and will cover topics including approved traffic pattern entry procedures, CTAF best practices, and more!

Flying in non-towered airports is not inherently dangerous; odds are that most of us either learned in them or operate from them often. However, they do require pilots to follow the rules and pay attention to their surroundings, especially at uncontrolled airports with a mix of traffic (turbines, GA, helicopters, etc.).

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