The FAA Control Tower Operator (CTO) certificate under 14 CFR Part 65 Subpart B begins with a written knowledge test on seven areas — part 91 flight rules, airport and en route traffic control procedures, communications, flight assistance service, air navigation, and aviation weather — and a score of 70 percent or higher is required to pass. You then qualify for operating positions and, after six months of service, a facility rating through practical tests. This guide verifies the rules you must know, works a complete duty-hours exercise, and sends each technique topic to the official reference that tests it.
What the CTO certificate is and how you earn it
The Control Tower Operator (CTO) certificate is an FAA airmen certificate governed by 14 CFR Part 65, Subpart B. You qualify by meeting the eligibility rules in §65.33, passing the written knowledge test in §65.35 with at least 70 percent, and passing the practical tests in §65.37 for your operating positions and, after six months of service, the facility rating under §65.39 and §65.41.
The legal basis is §65.31: no one may act as an air traffic control tower operator for civil aircraft unless they hold an FAA Credential with a tower rating or a CTO certificate, and hold a facility rating for that tower or work at qualified positions under a facility rating holder's supervision. Since a February 2015 amendment, FAA employees and active-duty military controllers instead hold the AOV Credential with tower rating, so the CTO certificate remains the route for non-federal tower operators.
Eligibility under §65.33 means being at least 18 years old, being of good moral character, and being able to read, write, and understand English and speak it without an accent or impediment that would interfere with two-way radio conversation. Unless you are employed by the FAA or serving with the Armed Forces or Coast Guard, you also need a second-class medical certificate issued within the 12 months before you apply. The application goes on FAA Form 8400-3 to the Airmen Certification Branch.
The written test in §65.35 covers seven areas: part 91 flight rules, airport traffic control procedures, en route traffic control procedures, communications operating procedures, flight assistance service, air navigation and aids to air navigation, and aviation weather. The FAA's CTO Study Guide (TS-14-1, February 2022) presents those areas in priority order and confirms that a score of 70 percent or higher is required to pass. Only a CTO Examiner (CTO-E) may issue the test, and a failed test carries a 30-day wait before retesting.
Knowledge is only half the certificate. §65.37 requires a practical test on control tower equipment and its use, weather reporting procedures, NOTAMs and the Aeronautical Information Manual, operational forms, and the procedures applicable to each operating position — airport layout, traffic patterns, radar and nonradar separation standards, and more. A facility rating takes six months of satisfactory service at the tower (§65.39) plus a practical test on every applicable item (§65.41), and §65.50 requires you to have served at least three of the preceding six months, or requalified, to keep performing duties under the certificate.
Practice exercise
Except in an emergency, what duty-hour limits does 14 CFR §65.47 place on a certificated control tower operator?
Show answer
You must be relieved of all duties for at least 24 consecutive hours at least once in every 7 consecutive days. You may not serve more than 10 consecutive hours, nor more than 10 hours within a period of 24 consecutive hours unless you have had a rest period of at least 8 hours at or before the end of the 10 hours of duty.
Each limit is a separate test point: the weekly 24-hour relief, the 10-consecutive-hour ceiling, and the 10-in-24 rule with its built-in 8-hour rest condition. A distractor that swaps the numbers — for example, an 8-hour rest required only after 12 hours of duty — fails both the ceiling and the rest requirement, which is why the regulation states each limit explicitly.
Official sources: 14 CFR Part 65 Subpart B — Air Traffic Control Tower Operators (eCFR); AOV Credentialing and Control Tower Operator Certificate Programs (FAA); Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA); Control Tower Operator (CTO) Specific FAQs (FAA); CTO Certification Information Pamphlet, June 2020 (FAA)
Separation standards: learn the rules where they live
The written test's airport traffic control procedures area draws on FAA Order JO 7110.65, Air Traffic Control, and the study guide's Part 1 questions cover handoffs, point outs, radar separation, Special VFR, and gate hold. Learn wake turbulence categories and spacing minima from that order itself rather than from any summary.
Part 1 of the study guide directs you to specific chapters of FAA Order JO 7110.65, Air Traffic Control, along with Chapter 8 of Order JO 7110.10, Flight Services. That order is where the separation procedures you will be tested on are written, so treat it — not a summary, including this one — as the source for wake turbulence categories and spacing values.
The study guide's own Part 1 questions show the flavor of what is asked: which procedure lets one controller transfer radar identification and retain radio communications, how radar separation is applied between beacon control slashes, when interfacility transfers of radar identification must occur, and how Special VFR climbs and gate hold procedures are authorized.
Separation also appears in the practical test: §65.37 requires demonstrating the application of the prescribed radar and nonradar separation standard for each operating position. Paper study supports that demonstration but cannot replace facility training.
Official sources: 14 CFR Part 65 Subpart B — Air Traffic Control Tower Operators (eCFR); Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Light gun signals: drill the matrix from the official table
Light gun signals are a routed study topic: the FAA's CTO Study Guide lists the Aeronautical Information Manual and FAA Order JO 7110.65, Air Traffic Control, as required reference material, so drill the signal matrix from those documents rather than from a summary.
Before you begin, the study guide requires you to obtain the Aeronautical Information Manual and FAA Order JO 7110.65, Air Traffic Control. The light gun signal meanings live in those documents, so learn each signal exactly as printed rather than from a paraphrase, including this one.
Study the table as a matrix, not a list: cover one column and recall it from the other, then reverse the drill. Finish every row by stating the acknowledgment action, so signal, meaning, and confirmation stay linked. If two signals feel interchangeable, put the contrasting pair on a card until the distinction holds under time pressure.
Official sources: Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Readback and hearback: a scripting drill that scores itself
Communications operating procedures are one of the seven written-test areas, and phraseology practice transfers directly to the practical test. Script exchanges on paper, then check them against FAA Order JO 7110.65, paragraph 2-4-3, which separates general acknowledgment from required read back of specific items.
Set up the drill: script a complete taxi exchange — controller instructions and pilot responses — using the radio message format and phraseology of FAA Order JO 7110.65 as your model. Then score it against paragraph 2-4-3, Pilot Acknowledgment/Read Back. That paragraph requires pilots to acknowledge all clearances and instructions, but it singles out hold short instructions — whether part of taxi instructions or a LAHSO clearance — for read back, and it requires call signs in any read back.
Worked example: the controller says, 'November Five One Two Charlie Kilo, hold short of Runway One Eight.' The pilot replies, 'November Five One Two Charlie Kilo, roger.' That acknowledges the instruction but does not read back the hold-short instruction. A complete reply includes the instruction and aircraft identification: 'Hold short of Runway One Eight, November Five One Two Charlie Kilo.' The controller checks that the readback is correct. The AIM note in the same paragraph permits acknowledgment in other words unless a procedure or controller request requires readback; hold-short instructions have an explicit readback requirement.
Runway designators deserve their own pronunciation practice: say each digit separately — 'Runway Two Seven Right,' not 'twenty-seven' — and state 'left,' 'right,' or 'center' for a parallel runway, as the order's numbers-usage rules direct.
Practice exercise
The controller says, 'November Four Three One Bravo, hold short of Runway One Eight.' The pilot answers, 'November Four Three One Bravo, roger.' Under FAA Order JO 7110.65 paragraph 2-4-3, what must the pilot's reply include?
Show answer
The pilot must read back the hold-short instruction and include the aircraft identification. For example: 'Hold short of Runway One Eight, November Four Three One Bravo.' The controller must check that the items read back are correct.
Acknowledging receipt is different from reading back the instruction. Paragraph 2-4-3 specifically requires hold-short readbacks, including hold-short instructions given as part of taxi instructions or a LAHSO clearance. An acknowledgment alone does not satisfy that requirement.
- Script one departure exchange and one arrival exchange, using JO 7110.65 phraseology as the model
- Rewrite any response that omits a required read-back item — hold short instructions above all — or leaves the instruction ambiguous
- Read your scripts aloud so pronunciation habits form alongside the wording
- Keep the AIM open while you script so you check wording instead of guessing
Official sources: FAA Order JO 7110.65, Chapter 2, Section 4 — Radio and Interphone Communications; Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Aviation weather: from METAR to the words you would transmit
Aviation weather is a tested area in its own right. The February 2022 study guide names FAA Order 7900.5, Surface Weather Observing, and AC 00-45, Aviation Weather Services, among its references — but AC 00-45H was cancelled in December 2022, and the FAA now consolidates weather guidance in the Aviation Weather Handbook, FAA-H-8083-28B. Practice turning a written report into the elements you would transmit.
Mind the edition. The study guide's reference list reflects its February 2022 date, and AC 00-45H was cancelled on December 22, 2022, when the FAA consolidated its weather advisory circulars into a single handbook. For current study, use FAA-H-8083-28B, Aviation Weather Handbook; keep Order 7900.5 for surface observing conventions as the study guide lists it.
The transmit side has its own rules in the order's numbers-usage paragraph: an altimeter setting of 30.01 is spoken 'Altimeter, three zero zero one,' and surface wind goes as the separate digits of direction to the nearest 10 degrees, the word 'at,' and the velocity in knots, including any gusts.
A drill that pays off: take one METAR per study day, extract the ceiling, visibility, altimeter setting, and significant weather, and state the wind and altimeter as the phrases above. Where a report convention differs from a transmission convention, check the handbook rather than trusting a summary, including this one.
Practice exercise
The tower surface-wind display gives a magnetic direction of 270 degrees, a speed of 15 knots and gusts of 35 knots. The altimeter setting is 30.01 inches of mercury. State the wind and altimeter setting using the numbers-usage rules in FAA Order JO 7110.65.
Show answer
'Wind two seven zero at one five gusts three five' and 'Altimeter, three zero zero one.'
Both statements follow the numbers-usage rules of FAA Order JO 7110.65: surface wind is stated as the separate digits of direction to the nearest 10-degree multiple, the word 'at,' and the separate digits of velocity in knots, including gusts; the altimeter setting is the word 'altimeter' followed by the separate digits. A common wrong pattern reads the gust as a separate item or drops a digit from the altimeter setting — the order requires every digit.
Official sources: FAA Order JO 7110.65, Chapter 2, Section 4 — Radio and Interphone Communications; AC 00-45H, Aviation Weather Services, Change 2 (Cancelled 2022-12-22); FAA-H-8083-28B, Aviation Weather Handbook; Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Flight assistance service: the emergency topics in Part 4
Part 4 of the study guide covers flight assistance service, and its emergency questions concentrate on bomb threats, guiding an emergency aircraft to an airport, emergency locator transmitter (ELT) signals, and overdue aircraft. Study each topic with the study guide and the AIM open.
The bomb-threat questions run from notification — who you tell when a threat concerns an aircraft on the ground versus in the air — to handling a pilot who insists on departing and the distance you advise other traffic to keep from the threat aircraft.
The ELT questions cover coordination with the Rescue Coordination Center, who receives and relays ELT information, and a duty-station rule the study guide poses as one of its questions. The overdue-aircraft questions distinguish aircraft on IFR flight plans from those on VFR flight plans or no flight plan, with separate timing for each.
Work through Part 4 with the answer key at the end of the section, and reread the cited reference whenever you miss a question — the study guide is built for exactly that loop.
Official sources: Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Surface vocabulary, a study sequence, and readiness checks
Learn surface-event terms exactly as the official references define them, then sequence your practice so vocabulary comes first and combined paper scenarios come last.
Surface operations vocabulary is precise legal language, and paraphrase is where candidates lose it. Look up each term — runway incursion, surface incident, vehicle or pedestrian deviation — in the AIM and the air traffic control orders, and learn the definitions as written rather than as commonly repeated.
Sequence your practice so later work builds on earlier definitions: fix the vocabulary first, add a daily weather-report drill, then paper scenarios that deliberately combine two rules such as separation plus wind, and finally full scripted exchanges scored against your readback drill. Stretch or compress the timeline to fit your calendar; the order matters more than the duration.
- Reproduce the light gun signal matrix from the AIM from memory, both directions, plus each acknowledgment action
- Convert a report's wind and altimeter setting aloud using the JO 7110.65 phrasing, without hesitation
- Define the surface-event terms exactly as the official references do, without notes
- Reread the cited reference for every study-guide question you missed, then re-answer it the next day
Official sources: FAA Order JO 7110.65, Chapter 2, Section 4 — Radio and Interphone Communications; Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
Official sources
Exam facts checked:
- FAA Order JO 7110.65, Chapter 2, Section 4 — Radio and Interphone Communications
- AC 00-45H, Aviation Weather Services, Change 2 (Cancelled 2022-12-22)
- FAA-H-8083-28B, Aviation Weather Handbook
- 14 CFR Part 65 Subpart B — Air Traffic Control Tower Operators (eCFR)
- AOV Credentialing and Control Tower Operator Certificate Programs (FAA)
- Control Tower Operator (CTO) Study Guide, TS-14-1, February 2022 (FAA)
- Control Tower Operator (CTO) Specific FAQs (FAA)
- Control Tower Operator (CTO) Study Guide landing page (FAA)
- CTO Certification Information Pamphlet, June 2020 (FAA)
- CTO Facility Rating Test Information (FAA)