{"id":21877544,"date":"2026-09-12T16:25:44","date_gmt":"2026-09-12T14:25:44","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/mayday-pan-pan-squawk-7700-pilot-radio-phraseology\/"},"modified":"2026-09-12T16:28:58","modified_gmt":"2026-09-12T14:28:58","slug":"mayday-pan-pan-squawk-7700-pilot-radio-phraseology","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/mayday-pan-pan-squawk-7700-pilot-radio-phraseology\/","title":{"rendered":"Mayday, Pan-Pan and Squawk 7700: What Pilots Say on the Radio"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>A controller is working a busy approach frequency. Four aircraft are talking over one another about runway changes and speed restrictions. Then one voice comes through, flat and unhurried, and says a single word three times. Everyone else stops transmitting. Nobody was told to. They simply stop.<\/p>\r\n\r\n<p>That word is <strong>Mayday<\/strong>, and it is the most powerful thing a pilot can say on a radio. It is not a cry for help in any emotional sense. It is a procedural instrument: a word that, under international rules, clears a frequency and reassigns priority in the space of about two seconds.<\/p>\r\n\r\n<p>Almost everything pilots say on the radio works like that. It sounds like jargon, and a lot of it sounds faintly ridiculous, but nearly every phrase exists because somebody once misunderstood something and people died. Here is what the words actually mean, where they came from, and which of the popular explanations are wrong.<\/p>\r\n\r\n\r\n<div style=\"background:#f5f5f5;padding:20px;margin:28px 0;font-size:15px;line-height:1.8\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px\">Quick Facts<\/p><p style=\"margin:4px 0\"><strong>Distress call:<\/strong> MAYDAY, preferably spoken three times (FAA AIM 6-3-1)<\/p><p style=\"margin:4px 0\"><strong>Urgency call:<\/strong> PAN-PAN, spoken the same way<\/p><p style=\"margin:4px 0\"><strong>Priority:<\/strong> Mayday commands radio silence; Pan-Pan outranks everything except a Mayday<\/p><p style=\"margin:4px 0\"><strong>Emergency frequencies:<\/strong> 121.5 MHz (civil), 243.0 MHz (military)<\/p><p style=\"margin:4px 0\"><strong>Emergency squawks:<\/strong> 7500 unlawful interference, 7600 radio failure, 7700 general emergency<\/p><p style=\"margin:4px 0\"><strong>Alphabet in use:<\/strong> ICAO, adopted 1956. R is Romeo, not Roger<\/p><p style=\"margin:4px 0\"><strong>Governing documents:<\/strong> ICAO Annex 10 and Doc 9432; FAA AIM chapters 4 and 6<\/p><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Mayday: the word that commands silence<\/h2>\r\n\r\n<p>The FAA\u2019s <em>Aeronautical Information Manual<\/em> is unromantic about it. Paragraph 6-3-1 says the initial communication by an aircraft in distress &ldquo;should begin with the signal MAYDAY, preferably repeated three times,&rdquo; and that &ldquo;the word MAYDAY commands radio silence on the frequency in use.&rdquo; Not requests. Commands.<\/p>\r\n\r\n<p>Distress means grave and imminent danger requiring immediate assistance. Engine fire, control failure, uncontained smoke, fuel exhaustion. Once the call is made, the pilot is released from a great deal of the rulebook, because the rulebook exists to keep aircraft apart and there is now something more urgent to worry about.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;Speed limits and airspace rules all go out the window once you declare an emergency.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Capt. Ken Hoke<\/strong> &mdash; Boeing 757\/767 captain, interviewed by Flightradar24<\/div><\/div><\/div>\r\n\r\n\r\n<p>The AIM also prescribes the order of what comes next, and it is worth knowing because it is a checklist for a brain that has stopped working properly: the call itself, the station addressed, aircraft identification and type, the nature of the emergency, weather, intentions, position and heading, altitude, fuel remaining in minutes, and souls on board. Fuel and souls are the last two for a reason. They are what search and rescue needs if the rest of it goes badly.<\/p>\r\n\r\n<p>The most famous Mayday in modern aviation lasted about thirty-five seconds. On 15 January 2009, US Airways 1549 lost both engines to a bird strike over New York. What the transcript records is not panic but a man running out of options in public.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #d32f2f;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;We\u2019re gonna be in the Hudson.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Capt. Chesley &ldquo;Sully&rdquo; Sullenberger<\/strong> &mdash; US Airways Flight 1549, 15 January 2009, from the FAA-released ATC transcript<\/div><\/div><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Pan-Pan: the call almost nobody uses<\/h2>\r\n\r\n<p>Below distress sits <strong>urgency<\/strong>, and its call sign is <strong>Pan-Pan<\/strong>, also spoken three times. The AIM gives it the same treatment: it &ldquo;warns other stations not to interfere,&rdquo; and it outranks every transmission on the frequency except a Mayday.<\/p>\r\n\r\n<p>Pan-Pan is for a problem that is real but not yet lethal. A sick passenger. One generator lost. A rough-running engine that is still producing thrust. A pilot who is lost. The distinction is not how frightened you are, it is whether you need help right now or merely soon.<\/p>\r\n\r\n<p>In practice it is badly underused. Pilots reach past Pan-Pan for the informal &ldquo;we\u2019d like to declare an emergency&rdquo; or, worse, say nothing at all and try to sort the problem out quietly. Every safety organisation that has looked at the habit has said the same thing: the cost of calling Pan-Pan and not needing it is a bit of paperwork. The cost of not calling it is measured differently.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/bendix-king-navcom-radio-stack-cessna-172-1.jpg\" alt=\"A Bendix\/King navcom radio stack in the instrument panel of a Cessna 172\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A navcom stack in a Cessna 172. Two radios, four frequencies, and a vocabulary of perhaps two hundred approved words. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Why three times?<\/h2>\r\n\r\n<p>Because English contains the word &ldquo;mayday&rdquo; in other contexts, and because VHF radio is a lossy medium. A single utterance can be clipped by a late transmitter keying, swallowed by a squelch break, or simply misheard as part of a sentence. Three repetitions make the call unmistakable as a formal signal rather than a mention of one, and they give a controller who was writing something down a second chance to catch it.<\/p>\r\n\r\n<p>The same logic runs through the whole of aviation radio. It is why headings are spoken digit by digit, why nine is pronounced &ldquo;niner&rdquo; so it cannot be confused with the German <em>nein<\/em>, and why the FAA prints &ldquo;tree&rdquo;, &ldquo;fife&rdquo; and &ldquo;fow-er&rdquo; in its own alphabet table. The language is deliberately slightly wrong so that it cannot accidentally be something else.<\/p>\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/UWpwl-NPnrM\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<p>Captain Joe\u2019s explainer above, with well over two million views, is the clearest short account of the Mayday and Pan-Pan distinction on the internet, and it uses real radiotelephony examples rather than paraphrase.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">Roger, Wilco, and the Roger who never existed<\/h2>\r\n\r\n<p>There was no Roger. &ldquo;Roger&rdquo; simply meant the letter R, and R stood for <em>received<\/em>. In the spelling alphabets the US military used from the late 1920s through the Second World War, R was Roger, and acknowledging a transmission with &ldquo;Roger&rdquo; was shorthand for &ldquo;your message has been received.&rdquo; That is all it ever claimed. It did not promise that anything would be done about it.<\/p>\r\n\r\n<p>In 1956, ICAO adopted the alphabet still in use today, and R became Romeo. &ldquo;Roger&rdquo; should have died with the alphabet that produced it. It did not, partly because the film industry had already made it famous and partly because Apollo astronauts said it on live television for a decade. It survives today as a procedure word with no letter attached to it.<\/p>\r\n\r\n<p>Its companion is <strong>Wilco<\/strong>, a contraction of <em>will comply<\/em>, and the two are not interchangeable. Roger means &ldquo;heard you&rdquo;. Wilco means &ldquo;heard you and I am doing it&rdquo;. Saying &ldquo;Roger Wilco&rdquo; is redundant, which is exactly why Hollywood loves it. The AIM lists the acceptable acknowledgements plainly in paragraph 4-2-3: &ldquo;Wilco,&rdquo; &ldquo;Roger,&rdquo; &ldquo;Affirmative,&rdquo; &ldquo;Negative,&rdquo; or other appropriate remarks.<\/p>\r\n\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;For reasons unknown, it is impossible for a crew member to simply say, for instance: \u201cI am driving my car to work.\u201d Instead, he or she must say, \u201cAt this time, I am operating my vehicle to my location of employment.\u201d&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Patrick Smith<\/strong> &mdash; Airline pilot and author of <em>Cockpit Confidential<\/em>, writing at AskThePilot.com<\/div><\/div><\/div>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/civilian-air-traffic-controllers-memphis-radio-1.jpg\" alt=\"Civilian air traffic controllers at work in Memphis, Tennessee\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">The receiving end. A controller may work a dozen aircraft at once, which is why the vocabulary is small and the grammar is rigid. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">Charlie, Papa, and the alphabet that is not phonetic<\/h2>\r\n\r\n<p>The ICAO alphabet exists so that letters cannot be confused across a noisy channel spoken by people with thirty different first languages. B and D and E and P all collapse into mush on VHF. Bravo, Delta, Echo and Papa do not. The FAA publishes the pronunciation in its own table: Charlie is CHAR-LEE or SHAR-LEE, Papa is PAH-PAH with the stress on the second syllable, Quebec is KEH-BECK.<\/p>\r\n\r\n<p>So why do people search for &ldquo;why do pilots say Charlie Charlie&rdquo;? Because they have heard it, usually on a maritime or regional frequency, used to mean &ldquo;understood&rdquo; or &ldquo;correct&rdquo;. It is not standard aviation phraseology. It appears in no ICAO document and no FAA publication. It is informal usage, it varies by region, and a controller in Frankfurt or Dubai would treat it as noise. If you hear it in a cockpit video, you are hearing a habit, not a procedure.<\/p>\r\n\r\n<p>&ldquo;Papa&rdquo; on its own is simply the letter P. It appears constantly because registration letters, taxiway designators and approach identifiers are full of Ps, not because it carries any hidden meaning.<\/p>\r\n\r\n\r\n<div style=\"display:flex;justify-content:center;margin:2em 0\"><blockquote class=\"reddit-embed-bq\" data-embed-height=\"500\"><a href=\"https:\/\/www.reddit.com\/r\/flying\/comments\/37n2xb\/\">Had to call Pan Pan in a Cessna 152 yesterday due to flight control failure<\/a><\/blockquote><script async src=\"https:\/\/embed.reddit.com\/widgets.js\" charset=\"utf-8\"><\/script><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">7500, 7600, 7700: the three numbers you never dial by accident<\/h2>\r\n\r\n<p>The transponder gives a pilot a second, silent voice. Three four-digit codes are reserved worldwide under ICAO Annex 10, and setting any of them lights up every radar screen in range without a word being spoken.<\/p>\r\n\r\n<p><strong>7700<\/strong> is general emergency. The AIM tells pilots to select it if they cannot immediately raise anyone on the radio. <strong>7600<\/strong> is radio communications failure, and it triggers a set of pre-agreed assumptions on the ground about where the aircraft will go and what altitude it will fly. <strong>7500<\/strong> is unlawful interference, and the AIM is unusually blunt about it: the code &ldquo;will never be assigned by ATC without prior notification from the pilot that the aircraft is being subjected to unlawful interference,&rdquo; and a controller receiving it will ask the crew to verify.<\/p>\r\n\r\n<p>That verification request is one of the quieter pieces of design genius in the system. If the code was set by mistake, the crew simply say so. If it was not, and a hijacker is listening, the crew can answer normally and the controller stops asking questions and starts making phone calls.<\/p>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/transponder-squawk-code-7700-7600-7500-panel-1.jpg\" alt=\"A Cessna ARC RT-359A transponder and Bendix\/King communications radio in a light aircraft instrument panel\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A transponder head. Four digits, dialled in seconds, that say more than a radio call can. Photo: Wikimedia Commons<\/figcaption><\/figure>\r\n\r\n\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/H4skJviQlMo\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n\r\n<h2 style=\"padding-top:22px\">The five C\u2019s, and what to do when you are lost<\/h2>\r\n\r\n<p>Every student pilot in the English-speaking world learns a mnemonic for being lost: <strong>Climb, Communicate, Confess, Comply, Conserve<\/strong>. It is a training device rather than a line in a regulation, but it maps almost exactly onto what the AIM actually instructs a pilot in difficulty to do.<\/p>\r\n\r\n<p><em>Climb<\/em>, because altitude buys radio range, radar coverage and time. <em>Communicate<\/em>, on the frequency in use or on 121.5. <em>Confess<\/em>, which is the hard one, because admitting you do not know where you are feels like a professional failure and is in fact the single most useful thing you can transmit. <em>Comply<\/em> with what you are then told. <em>Conserve<\/em> fuel, because every option you have left is bought with it.<\/p>\r\n\r\n<p>The confess step is the one that gets people killed when they skip it. Controllers are not disciplinary authorities. They are people with a radar picture you do not have.<\/p>\r\n\r\n<h2 style=\"padding-top:22px\">The two words that changed the language forever<\/h2>\r\n\r\n<p>On 27 March 1977, in fog at Los Rodeos on Tenerife, a KLM 747 began its takeoff roll while a Pan Am 747 was still on the runway. 583 people died, and it remains the deadliest accident in aviation history. There was no mechanical failure. There was a radio call that could be read two ways.<\/p>\r\n\r\n<p>The consequence is something every pilot alive now says without thinking about it. The word &ldquo;takeoff&rdquo; is reserved for the clearance itself. In every other context, before and after, crews and controllers say &ldquo;departure&rdquo;. You are not at the takeoff point, you are at the departure point. You did not request takeoff, you requested departure. The word is quarantined so that it can only ever mean one thing.<\/p>\r\n\r\n<p>That is the whole philosophy in one change. Radio phraseology is not jargon for its own sake and it is not a club language. It is a very small vocabulary, deliberately stripped of ambiguity, maintained by an international body, and amended whenever somebody discovers a new way to be misunderstood. When a pilot says Mayday three times, that is the system working exactly as designed. When they say &ldquo;Charlie Charlie&rdquo;, that is just a person talking.<\/p>\r\n\r\n\r\n<style>.mfq{margin:34px 0 8px}.mfq h2{font:26px\/1.3 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117;padding-top:22px;margin:0 0 6px}.mfq .qa details{border-top:1px solid #5C91FF;margin:0;padding:0}.mfq .qa details:last-of-type{border-bottom:1px solid #e2e7ee}.mfq .qa summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;font:18px\/1.7 \"Gilroy semiBold\",Helvetica,Arial,sans-serif;color:#0d1117}.mfq .qa summary::-webkit-details-marker{display:none}.mfq .qa summary::after{content:\"+\";font:24px Helvetica,sans-serif;color:#3568e0;flex:0 0 auto}.mfq .qa details[open] summary::after{content:\"\\2013\"}.mfq .qa details:hover summary{color:#3568e0}.mfq .qa .a{font:16px\/1.7 \"Gilroy regular\",Helvetica,Arial,sans-serif;color:#454e5e;padding:0 26px 24px}.mfq .qa .a a{color:#3568e0}@media(max-width:680px){.mfq .qa summary{padding:18px 14px;font-size:17px}.mfq .qa .a{padding:0 14px 20px}}<\/style>\r\n\r\n\r\n<section class=\"mfq\"><h2>Frequently Asked Questions<\/h2><div class=\"qa\"><details open><summary>What does Mayday mean and why do pilots say it three times?<\/summary><div class=\"a\">Mayday is the international radiotelephony distress signal, used when an aircraft is in grave and imminent danger and needs immediate assistance. The FAA\u2019s Aeronautical Information Manual says the call should begin with MAYDAY &ldquo;preferably repeated three times&rdquo;, and that the word commands radio silence on the frequency in use. It is spoken three times because a single utterance can be clipped by radio interference or mistaken for a passing mention of the word rather than a formal signal.<\/div><\/details><details><summary>What is the difference between Mayday and Pan-Pan?<\/summary><div class=\"a\">Mayday signals distress: grave and imminent danger requiring immediate help, and it takes absolute priority over all other transmissions. Pan-Pan signals urgency: a genuine safety concern that does not require immediate assistance, such as a sick passenger, a single system failure or a pilot who is lost. Pan-Pan outranks every other transmission except a Mayday. Both are spoken three times.<\/div><\/details><details><summary>Why do pilots say &ldquo;Roger&rdquo; instead of &ldquo;yes&rdquo;?<\/summary><div class=\"a\">&ldquo;Roger&rdquo; is not a name and has nothing to do with agreement. In the spelling alphabets used by the US military from the late 1920s until 1956, the letter R was spoken as &ldquo;Roger&rdquo;, and R stood for &ldquo;received&rdquo;. Acknowledging with Roger therefore meant &ldquo;your transmission has been received&rdquo;, nothing more. ICAO replaced Roger with Romeo in 1956, but the procedure word survived on its own.<\/div><\/details><details><summary>What is the difference between Roger and Wilco?<\/summary><div class=\"a\">Roger means the message was received. Wilco is a contraction of &ldquo;will comply&rdquo; and means the message was received and the instruction will be carried out. Wilco therefore includes Roger, which is why saying &ldquo;Roger Wilco&rdquo; is redundant even though films use it constantly. The FAA lists Wilco, Roger, Affirmative and Negative as acceptable acknowledgements in AIM paragraph 4-2-3.<\/div><\/details><details><summary>Do pilots really say &ldquo;Charlie Charlie&rdquo;, and what does it mean?<\/summary><div class=\"a\">&ldquo;Charlie Charlie&rdquo; is informal usage meaning roughly &ldquo;understood&rdquo; or &ldquo;correct&rdquo;. It is heard on some maritime and regional frequencies, but it is not standard aviation phraseology: it appears in no ICAO document and no FAA publication. Charlie on its own is simply the ICAO phonetic word for the letter C. A controller working international traffic would not treat the doubled form as a recognised call.<\/div><\/details><details><summary>What do squawk codes 7500, 7600 and 7700 mean?<\/summary><div class=\"a\">These three transponder codes are reserved worldwide under ICAO Annex 10. 7700 is a general emergency, 7600 is a two-way radio communications failure, and 7500 signals unlawful interference, meaning hijacking. Setting any of them alerts every radar facility in range without a word being spoken. The FAA notes that 7500 will never be assigned by a controller, and that a controller seeing it will ask the crew to verify the code.<\/div><\/details><details><summary>Where does the word Mayday actually come from?<\/summary><div class=\"a\">The usual account credits Frederick Stanley Mockford, a radio officer at London\u2019s Croydon Airport, with proposing &ldquo;Mayday&rdquo; in 1923 as an English rendering of the French <em>m\u2019aider<\/em>, from <em>venez m\u2019aider<\/em>, because much of Croydon\u2019s traffic flew to Le Bourget in Paris. The story is repeated everywhere but is poorly documented, and language researchers treat it as plausible rather than established. What is better attested is that the call was formalised internationally later in the 1920s.<\/div><\/details><details><summary>What are the five C\u2019s in aviation?<\/summary><div class=\"a\">Climb, Communicate, Confess, Comply and Conserve: the mnemonic taught to student pilots for what to do when lost or disoriented. Climb for radio and radar range, communicate on the frequency in use or 121.5 MHz, confess that you do not know where you are, comply with the instructions you are given, and conserve fuel. It is a training device rather than a regulation, but it closely follows the actions the FAA sets out for a pilot in difficulty.<\/div><\/details><\/div><\/section>\r\n\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What does Mayday mean and why do pilots say it three times?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Mayday is the international radiotelephony distress signal, used when an aircraft is in grave and imminent danger and needs immediate assistance. The FAA\u2019s Aeronautical Information Manual says the call should begin with MAYDAY \\\"preferably repeated three times\\\", and that the word commands radio silence on the frequency in use. It is spoken three times because a single utterance can be clipped by radio interference or mistaken for a passing mention of the word rather than a formal signal.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between Mayday and Pan-Pan?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Mayday signals distress: grave and imminent danger requiring immediate help, and it takes absolute priority over all other transmissions. Pan-Pan signals urgency: a genuine safety concern that does not require immediate assistance, such as a sick passenger, a single system failure or a pilot who is lost. Pan-Pan outranks every other transmission except a Mayday. Both are spoken three times.\"}},{\"@type\":\"Question\",\"name\":\"Why do pilots say \\\"Roger\\\" instead of \\\"yes\\\"?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\\\"Roger\\\" is not a name and has nothing to do with agreement. In the spelling alphabets used by the US military from the late 1920s until 1956, the letter R was spoken as \\\"Roger\\\", and R stood for \\\"received\\\". Acknowledging with Roger therefore meant \\\"your transmission has been received\\\", nothing more. ICAO replaced Roger with Romeo in 1956, but the procedure word survived on its own.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between Roger and Wilco?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Roger means the message was received. Wilco is a contraction of \\\"will comply\\\" and means the message was received and the instruction will be carried out. Wilco therefore includes Roger, which is why saying \\\"Roger Wilco\\\" is redundant even though films use it constantly. 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A controller working international traffic would not treat the doubled form as a recognised call.\"}},{\"@type\":\"Question\",\"name\":\"What do squawk codes 7500, 7600 and 7700 mean?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These three transponder codes are reserved worldwide under ICAO Annex 10. 7700 is a general emergency, 7600 is a two-way radio communications failure, and 7500 signals unlawful interference, meaning hijacking. Setting any of them alerts every radar facility in range without a word being spoken. The FAA notes that 7500 will never be assigned by a controller, and that a controller seeing it will ask the crew to verify the code.\"}},{\"@type\":\"Question\",\"name\":\"Where does the word Mayday actually come from?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The usual account credits Frederick Stanley Mockford, a radio officer at London\u2019s Croydon Airport, with proposing \\\"Mayday\\\" in 1923 as an English rendering of the French m\u2019aider, from venez m\u2019aider, because much of Croydon\u2019s traffic flew to Le Bourget in Paris. The story is repeated everywhere but is poorly documented, and language researchers treat it as plausible rather than established. What is better attested is that the call was formalised internationally later in the 1920s.\"}},{\"@type\":\"Question\",\"name\":\"What are the five C\u2019s in aviation?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Climb, Communicate, Confess, Comply and Conserve: the mnemonic taught to student pilots for what to do when lost or disoriented. Climb for radio and radar range, communicate on the frequency in use or 121.5 MHz, confess that you do not know where you are, comply with the instructions you are given, and conserve fuel. It is a training device rather than a regulation, but it closely follows the actions the FAA sets out for a pilot in difficulty.\"}}]}<\/script><p><em>Sources: FAA Aeronautical Information Manual (paragraphs 4-2-3, 4-2-7, 6-3-1, 6-3-2, 6-3-4); ICAO Annex 10 and Doc 9432 Manual of Radiotelephony; Flightradar24 interview with Capt. Ken Hoke; AOPA, FAA transcript of US Airways Flight 1549; AskThePilot.com; NATO on the phonetic alphabet.<\/em><\/p>\r\n\r\n\r\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/tenerife-airport-disaster-1977\/\">Tenerife, 1977: The Two Minutes That Changed Aviation Forever<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/lost-comm-when-your-radio-goes-silent-at-8000-feet\/\">Lost Comm: When Your Radio Goes Silent at 8,000 Feet<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/why-fighter-pilots-get-callsigns-and-how-to-earn-one\/\">Why Fighter Pilots Get Callsigns (And How to Earn One)<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/bulgaria-mig-29-scramble-squawk-7500-lot-a320-2026\/\">Code 7500: Bulgaria\u2019s MiG-29 Scrambles<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>A controller is working a busy approach frequency. Four aircraft are talking over one another about runway changes and speed restrictions. Then one voice comes through, flat and unhurried, and says a single word three times. Everyone else stops transmitting. Nobody was told to. They simply stop. That word is Mayday, and it is the [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":21877130,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665],"tags":[],"class_list":["post-21877544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pilot Radio Phraseology: Mayday, Pan-Pan, Squawk 7700 | MiGFlug<\/title>\n<meta name=\"description\" content=\"What pilots actually say on the radio: Mayday, Pan-Pan, Roger, Wilco and squawk 7700 explained, plus the pilot radio phraseology rules behind each one.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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