Practice ATC phraseology out loud

This is practice for the words and the numbers on an ATC frequency. A simulated controller says a transmission. You answer in standard phraseology, out loud, the way AIM chapter 4 and the Pilot/Controller Glossary define it.

AIM 4-2-1 says understanding is the single most important part of pilot and controller communications. You acknowledge each ATC transmission with the aircraft call sign. Keep the contact short, and still make sure the controller knows what you want and you know what the controller wants. If a short phrase will not carry the point, use the words that will. Jargon, chatter, and slang do not belong there. The same paragraph points you at the Pilot/Controller Glossary and says it is the glossary inside FAA Order JO 7110.65.

Words that have one job

AIM 4-2-3 says you acknowledge with your aircraft identification, at the start or the end, and one of Wilco, Roger, Affirmative, Negative, or another remark that fits. The glossary fixes what those words mean.

Wilco means you have received the message, you understand it, and you will comply. Roger means you have received all of the last transmission. It should not be used to answer a question that needs a yes or a no. Affirmative means yes. Negative means no, or permission not granted, or that is not correct. Unable means you cannot comply with a specific instruction, request, or clearance. Those are different calls. Roger does not accept a hold short. Negative does not ask for a repeat. Unable is how you refuse a clearance you cannot fly. AIM 4-4-7 says it is the pilot's responsibility to accept or refuse the clearance issued.

Say again asks for a repeat of the last transmission. You usually name the part you missed. The glossary example is say again all after a fix. Speak slower asks for a lower speech rate. Stand by means pause, usually for higher priority work, or wait, as in stand by for clearance. The caller comes back if the delay is long. Stand by is not an approval and it is not a denial. Read back means repeat my message back to me.

AIM 4-2-3 also covers a frequency change. Acknowledge it. If you switch with no acknowledgement, the controller cannot tell a missed call from a radio failure. Change as soon as you are told, unless the instruction says to change at a time, a fix, or an altitude. Until then, stay on the frequency you have.

Numbers

AIM 4-2-7 says pilots should use the ICAO phonetic alphabet on initial contact with ATC, and for single letters or hard words when the frequency is bad. The table gives the telephony and a pronunciation. Nine is pronounced niner. Three is tree. Four is fower. Five is fife. Zero is zero. The letter of the call sign uses the word in that table: Alfa, Bravo, Charlie, and the rest. ATC can also ask you to use phonetics when similar call signs are on the frequency.

AIM 4-2-8 is how figures are spoken, and it is not the same rule for every number. Round hundreds and thousands up through 9,900, the kind of number used for a ceiling, are spoken as whole hundreds: 500 is five hundred, and 4,500 is four thousand five hundred. Above 9,900, the digits in front of thousand are separated: 10,000 is one zero thousand, and 13,500 is one three thousand five hundred. Airway numbers are spoken as Victor Twelve or J Five Thirty-Three, not digit by digit. Every other number is each digit: 10 is one zero. A radio frequency with a decimal is spoken with the word point, as in one two two point one. The note in that paragraph says ICAO says decimal, and the FAA honors decimal from military aircraft and from anyone required to use ICAO procedures.

Altitudes have their own paragraph, AIM 4-2-9. Below 18,000 feet MSL you state the digits of the thousands, plus the hundreds if there are any. 12,000 is one two thousand. 12,500 is one two thousand five hundred. At and above 18,000 feet you say flight level and then the digits. Flight level 190 is flight level one niner zero. Flight level 275 is flight level two seven five.

Directions are AIM 4-2-10. Bearing, course, heading, and wind direction are three digits, and they are magnetic. Say each digit. A magnetic course of 005 is zero zero five. Add the word true only when the direction is true. Speeds in AIM 4-2-11 are spoken the same way the examples show: 190 knots is one niner zero knots. Time in AIM 4-2-12 is digits as well. 0920 UTC is zero niner two zero.

What the readback is for

AIM 4-4-7 says the readback of the numbers is the double check. Pilots of airborne aircraft should read back altitude assignments, vectors, and runway assignments. Read them in the order they were given, and put the aircraft identification on the transmission. A runway on a departure or landing clearance includes left, right, or center when the airport has them. The IFR clearance page is the full copy. The hold short page is the ground case, where roger alone does not satisfy the readback the controller has to hear.

AIM 4-2-2 is the delivery. Listen before you transmit. Think before you press the button. Pause after you key so the first word is not clipped. Speak in a normal tone. After you release, wait. Calling again immediately often steps on the answer.

Practice it out loud

WilcoAI grades the readback against FAA standard phraseology. The controller is simulated. You hold push-to-talk, speak, and release. Correctness, clarity, and speed are the score. The debrief shows what you got right, what you missed, what to watch out for, and the transcript. One Daily Challenge attempt a day is free, about 60 to 90 seconds, with a streak and badges. No account. Set a callsign and aircraft once. iPhone and iPad, iOS 26 or later. The session needs internet. The glossary is in RegBrief. The oral on these words is Checkride.bot.

Training aid only. Not for flight use. Never act on simulated clearances.