A control tower picked out in gold at the centre of a near-black illustration, with broad concentric gold arcs spreading outward from its mast like radio waves

SLOP1126: Say Again: The Design of a Language That Cannot Be Misheard

Aviation radio English was engineered so that misunderstanding would be impossible. It isn't. This course reads the phraseology as a designed artefact, and reads the accident record as the evidence of where the design gives way.

Semester 1 · 2027 · Level 1

  • phraseology
  • human factors
  • safety design

Aviation radio English is a language built on purpose, by identifiable people, to make one kind of mistake impossible. It is worse than ordinary English at nearly everything, and that is the trade.

This course reads it as a designed artefact. For every rule: what problem was it for, what was the alternative, what evidence decided it — and does the evidence still hold. The accident record is the other half, and it is not here for drama. It is the only evidence available about where a language engineered against misunderstanding still lets misunderstanding through.

What you will do

You will be on a simulated frequency in week 1 and every week after it. You will work the controller position with errors planted in the readbacks and find out, as a number, how many you confirm as correct. You will read primary accident reports rather than summaries of them, and map their findings onto the phrases that now exist — the interesting rows are the ones that map onto nothing.

Then you will take the reasoning somewhere it has not been done for you. The largest piece of work in the course is anaudit of a spoken protocol outside aviation — a clinical handover, a signaller's exchange, the conference bridge on a major outage — and a phraseology designed for it, with an honest account of how your own proposal could make things worse.

Who it is for

First-year students, no prerequisites, no aviation background assumed and none rewarded. If you can hear the difference between two similar words you have everything you need on day one.

It is a level 1 course deliberately. Close-reading a transmission, and noticing when a protocol has quietly stopped being followed, is foundational literacy for anyone who will work on a safety-critical channel — which by graduation is most people. Filing it higher would concede it is a curiosity.

It is not an aviation English course, and the difference is the whole point. Those exist, they are taught inside aviation programmes, and they train someone who will work a live frequency up to the proficiency level their licence requires —Priya examines for exactly that, which is why she runs the drills here and not the argument. Nothing in this course is marked on whether you sound like a professional. You are marked on whether you can say why a phrase is the shape it is.

So you should probably not take it if you want to learn to fly: this is a course about language, and it will not help you pass a flight test. You might want it if you build systems where people talk to each other under pressure, or if you have ever watched a handover go wrong and been unable to say exactly what went wrong.

The twelve weeks

The lecture argues, the sim session drills, and four times a semester something is due.

  1. Week 1Why aviation invented its own EnglishFirst transmission: getting on frequency
  2. Week 2Alfa to Zulu: the spelling alphabet as an engineering artefactAlphabet and numbers, under noise
  3. Week 3Readback, hearback, and the loopRunning the loop with errors in it
  4. Week 4The word "takeoff"Clearance drills, including the illegal formsReadback Drills · 15%
  5. Week 5Tenerife, 1977From report to rule
  6. Week 6Numbers, levels, and the QNHLevels, pressure, and advisory versus instruction
  7. Week 7Non-standard phraseology and what it costsTranscript triageTranscript Analysis · 30%
  8. Week 8ICAO Level 4 as regulationRating the samples
  9. Week 9Accent, fatigue, and the party lineDegraded audio, and what the room heard
  10. Week 10CPDLC: text replaces voiceA datalink-only sector
  11. Week 11Transcribe and diagnoseAudit workshopPhraseology Audit · 35%
  12. Week 12What a designed language cannot fixAudit presentations and the live frequency checkLive Frequency Check · 20%

How it is marked

Four components. A small early drill to establish you can operate the thing being argued about, a transcript analysis, the audit, and ten minutes on a live frequency in week 12. Accent, fluency and speed are not criteria in any of them, and asking for a repeat counts in your favour — thefrequency check pagesays why at length.

Where to go next