Last Updated: May 7, 2026 | By: The E3 Aviation Editorial Team
CTAF frequency — the Common Traffic Advisory Frequency — is the radio channel GA pilots use to self-announce position and intentions at airports without an operating control tower. It’s how you stay safe when there’s no one in the tower telling you what to do. Used correctly, CTAF frequency calls prevent conflicts, build situational awareness, and keep the pattern orderly. Used incorrectly — or not at all — they create exactly the kind of mid-air collision scenario that ends careers and lives.
Most GA pilots learn the basics of CTAF during primary training. However, a lot of those lessons turn into half-habits over time. You make the call when you remember. You skip it when you’re busy configuring the aircraft. You forget which airports use CTAF versus UNICOM versus MULTICOM. That’s where the danger lives. This guide locks down every aspect of proper CTAF frequency use so you never wing-rock your way into a 15-knot conflict on final.
What Is CTAF Frequency and Why It Matters
CTAF frequency is a designated radio frequency used at non-towered airports — airports without an operating control tower — for pilots to communicate traffic advisories to each other. The FAA defines it in the Aeronautical Information Manual (AIM) Chapter 4, Section 1. At airports with no tower or a closed tower, CTAF is the primary communication frequency. Everyone in the area should be listening and broadcasting on the same channel.
Specifically, CTAF frequency serves one critical function: it replaces the tower controller with pilot self-discipline. Without someone in the cab issuing clearances, the traffic pattern becomes an honor system. Each pilot is responsible for announcing their position, intentions, and any conflicts they see. That only works if everyone is on the same frequency and making the right calls.
Where CTAF Frequency Information Comes From
You’ll find the CTAF frequency on your sectional chart, in ForeFlight or Garmin Pilot under Airport Info, and in the Chart Supplement (formerly Airport/Facility Directory). The frequency appears with a “C” symbol on sectional charts next to the airport identifier. Additionally, the automated weather broadcast at airports with AWOS or ASOS stations often announces the CTAF frequency at the end of the weather report.
Before every flight to an unfamiliar non-towered airport, verify the CTAF frequency during preflight planning. Do not rely on memory. Frequencies change. Temporary flight restrictions affect operations. A quick ForeFlight tap takes three seconds and eliminates the embarrassment of broadcasting on the wrong channel for an entire pattern entry.
Standard CTAF Radio Calls Every Pilot Must Know
Proper CTAF frequency calls follow a specific structure: airport name, your aircraft type and tail number, your position in the pattern, and your intentions. Every call starts and ends with the airport name. This tells any pilot on frequency which airport you’re broadcasting about — because in busy airspace, several airports may share or be near the same frequency.
Here’s the standard call sequence for arriving at a non-towered airport. Each call corresponds to a specific point in your approach. Skipping calls creates blind spots in situational awareness for everyone in the pattern.
10 Miles Out — Initial Call
“Podunk traffic, Cessna 1234X, ten miles south, inbound full stop, Podunk.” This call tells everyone you’re coming and from which direction. It gives pattern traffic time to adjust or plan for your arrival. Some pilots skip this call on short cross-country legs. Don’t. The pilot in the pattern doing touch-and-goes doesn’t know you exist until you make this call.
Entering the Traffic Pattern
“Podunk traffic, Cessna 1234X, entering downwind runway 27, full stop, Podunk.” You should be making this call when you turn from your 45-degree entry to the downwind leg. If you’re doing a straight-in approach, announce it clearly: “Podunk traffic, Cessna 1234X, three miles final runway 27, straight-in, full stop, Podunk.” Straight-in approaches require early and repeated announcements because pattern traffic may not see you on their left base or final until it’s too late.
Base and Final
Make a base leg call and a final call. Every time. Even if you haven’t heard anyone else in the pattern. Especially if you haven’t heard anyone. Silence on CTAF frequency doesn’t mean the pattern is empty. It means no one you know about is flying. Those are very different things. Unannounced aircraft — ultralights, gliders, and traffic not required to use radios — can be in the pattern without ever saying a word.
Clearing the Runway
“Podunk traffic, Cessna 1234X, clear of runway 27, Podunk.” Make this call after every landing. It tells anyone on short final that you’re off the active. It costs three seconds of radio time and potentially prevents a runway incursion.
CTAF vs. UNICOM vs. MULTICOM: What’s the Difference?
Pilots frequently confuse CTAF frequency with UNICOM and MULTICOM. These terms aren’t interchangeable.
CTAF is the concept — the designated frequency for traffic advisories at a specific airport. It may be the same frequency as UNICOM or another assigned frequency.
UNICOM is a non-government air-ground communication station often operated by an FBO. It provides airport advisory information — fuel availability, pattern favored, active runway. At airports where UNICOM is the CTAF, you’ll make your traffic calls on the UNICOM frequency.
MULTICOM is frequency 122.9 MHz, used as CTAF at airports with no tower and no UNICOM. It’s a shared “everyone uses this” frequency. When you see 122.9 as the CTAF at a small airport, that’s MULTICOM. Use it exactly the same way you’d use any other CTAF frequency.
When Towers Close — Part-Time CTAF Operations
Many airports have towers that close at night or on weekends. When the tower closes, the airport converts to CTAF operations on the tower frequency or a designated alternate. Always check NOTAMs and the Chart Supplement for tower hours. Arriving at a towered airport at 8 PM expecting ATC and getting silence instead is a fixable problem only if you planned for it.
What Happens When No One Responds on CTAF Frequency?
Silence doesn’t mean you’re alone. It means you’re alone among pilots with working radios who are actively monitoring. Ultralight pilots, sport pilots, glider pilots, and student pilots on solo may not be transmitting. Our take: treat every non-towered airport as if there’s invisible traffic in the pattern. Make your calls, look outside aggressively, and never assume the pattern is clear just because the radio is quiet.
If you make a call and hear someone else broadcasting simultaneously — a frequency conflict called a “stepped-on transmission” — wait a beat and re-broadcast. Both of you should pause briefly, then try again. The other pilot heard the same silence you did and will do the same thing.
Handling Conflicting Traffic on CTAF
When you hear another aircraft at the same airport making conflicting calls — same runway, converging positions — acknowledge it on CTAF frequency. “Podunk traffic, Cessna 1234X on three-mile final, have traffic in sight on left base.” This tells the other aircraft you see them. If you don’t see them, say so: “Cessna 1234X on final, negative traffic in sight.” Now both pilots know there’s a conflict and can sort it out.
Never assume the other pilot will yield just because you’re on final. Yield yourself if it’s safer. A go-around is always the right call when you’re unsure. A landing behind the aircraft on base is always better than a landing on top of it.
Common CTAF Mistakes That Put Pilots at Risk
Certain CTAF frequency errors show up consistently in NTSB accident reports and NASA ASRS incident databases. Knowing what they are helps you avoid them.
Not Listening Before Transmitting
The most common mistake: keying the mic before listening to the frequency for at least 10 seconds. If you transmit over another pilot’s call, you’ve stepped on their transmission and neither message got through. Monitor CTAF frequency for at least 30 seconds before your first call at any new airport.
Wrong Airport Name — Same Frequency
When two airports share a CTAF frequency, omitting the airport name from every call is dangerous. A pilot at Smallville Airport and a pilot at Tinytown Airport might both be on 122.8 MHz. If neither says the airport name, both think the traffic they’re hearing is at their airport. Say the airport name at the start and end of every call. Always.
Vague Position Reports
“Approaching the airport” is not a position report. “Five miles south, inbound for landing” is. Use compass directions, distances in miles, and runway references. Other pilots need to build a mental picture of where you are and where you’re going. Vague language forces them to make assumptions. Assumptions get people killed.
Forgetting the Calls When Workload Spikes
CTAF calls get dropped precisely when they’re most important: during a bumpy approach, when the engine sounds funny, or when you’re managing passengers. Build the habit so strong it’s automatic. If making a CTAF call while configuring for landing feels burdensome, you need more practice. Frequency discipline at non-towered airports isn’t optional — it’s what keeps the traffic pattern functional without a controller.
CTAF Frequency Best Practices for Departing Pilots
Arrivals get most of the focus, but departing pilots have CTAF responsibilities too. Before engine start, monitor CTAF frequency to build a mental picture of traffic in the area. After run-up, announce your departure: “Podunk traffic, Cessna 1234X, departing runway 27, northbound departure, Podunk.” This tells everyone in the pattern which direction you’re heading so they can adjust their spacing.
Additionally, make a call when you’re clear of the traffic pattern area — typically 10 miles out. This lets inbound traffic know the pattern is clearing. It’s a small gesture that costs nothing and helps everyone sequence more smoothly.
Frequently Asked Questions About CTAF Frequency
Is it required by law to make CTAF calls at non-towered airports?
For aircraft equipped with a radio, there is no specific FAR requiring CTAF calls at non-towered airports — but FAR 91.113 requires pilots to see and avoid other aircraft. CTAF calls are the primary mechanism for doing that in the pattern. Skipping them may be legal. It’s also reckless. Every instructor and examiner will hold you to the standard of making proper calls.
What CTAF frequency should I use when the tower is closed?
When a tower closes, the CTAF frequency is listed in the Chart Supplement and in NOTAMs for that airport. Often it reverts to the tower frequency itself or a designated UNICOM frequency. Always check before you depart for a tower airport you plan to arrive at after hours. ForeFlight and Garmin Pilot both show after-hours CTAF information in the airport details tab.
Can I use CTAF frequency to request advisories from the FBO?
Yes — when UNICOM frequency is the same as CTAF, you can request airport advisories from the FBO operator on the same frequency. However, keep in mind that FBO staff are not ATC. Their information is advisory only. They can tell you the favored runway and current winds, but they cannot issue clearances or guarantee separation. Your responsibility to see and avoid does not transfer to UNICOM.
Sources
- FAA Aeronautical Information Manual — Chapter 4, Section 1: Services Available to Pilots
- AVweb — CTAF and UNICOM Procedures for Non-Towered Airports
Related Reading:
CTAF Frequency Etiquette: Sharing the Frequency Professionally
CTAF is a shared resource. At busy non-towered airports, multiple aircraft may be in the pattern simultaneously, student pilots may be making extended calls, and FBO staff on UNICOM may be mixing traffic advisories with service requests. Good CTAF frequency etiquette keeps the channel usable for everyone.
Keep Calls Concise
The standard CTAF call takes five to eight seconds. Keep it that short. Don’t editorialize. Don’t narrate. “Smallville traffic, Cessna 1234X, downwind runway 24, full stop, Smallville” — that’s the call. Not “Smallville traffic, this is Cessna One Two Three Four Xray, we are currently on the left downwind for runway Two Four, we’re planning a full stop landing today.” The extra words block the frequency for other users and don’t add information.
Monitor Before You Transmit
At an unfamiliar airport, monitor the CTAF frequency for at least 60 seconds before your first transmission. Build a mental picture of who’s in the pattern and where. Then make your position call. Additionally, at any airport, listen for at least five seconds before keying the mic on any call — transmitting over another call accomplishes nothing and leaves both pilots with incomplete information.
The Courtesy of Position Clarity
When multiple aircraft are in the pattern simultaneously, your position calls become safety-critical data for other pilots. Specifically call your position by reference points they can use: “three-mile final,” “left downwind abeam the numbers,” “turning base runway 36.” Vague calls force other pilots to make assumptions — and assumptions in a crowded pattern can conflict fatally. Treat your CTAF calls the way a controller would treat a clearance: exact, verifiable, and actionable.
Night Operations and CTAF: Pilot Controlled Lighting
Night operations at non-towered airports add pilot controlled lighting (PCL) to the CTAF frequency picture. PCL activates runway lighting with specific click sequences on the CTAF frequency. Typically, clicking the mic seven times activates high-intensity lights, five clicks activate medium intensity, and three clicks activate low intensity. The lights then run for a set duration — usually 15 minutes — before automatically extinguishing.
Before a night arrival at a non-towered airport, check the Chart Supplement for PCL frequency and click sequence — not all airports use the same system. Activate PCL during your 10-mile initial call so lights are fully on before you enter the pattern. Additionally, reactivate PCL during your base-to-final turn if the sequence is about to expire. Arriving at a dark non-towered airport expecting lights that have timed out is an avoidable surprise with proper planning.
E3 Aviation Editorial Team
The E3 Aviation Association editorial team is made up of licensed pilots, aviation educators, and industry professionals dedicated to advancing general aviation safety, community, and education. Learn more about E3 Aviation.
