Clear messages, readbacks and conditions
Aeronautical communication is a closed-loop information process, not a contest to use the fewest words. Identify the station and aircraft, listen before transmitting, use the prescribed phraseology and preserve the actual clearance conditions. When standard phrases cannot express an unusual situation, clear plain language is preferable to a confident but misleading shortcut. This collection teaches theoretical interpretation and does not authorize movement or replace current procedures.
Receipt is not compliance
ROGER acknowledges receipt of the preceding transmission. It does not mean yes, does not promise compliance and cannot replace a required readback. WILCO indicates understanding and compliance, while UNABLE communicates that a request or instruction cannot be complied with. STAND BY asks the caller to wait; it is not an approval. SAY AGAIN requests repetition, whereas CORRECTION introduces a correction to the speaker's own transmission. Similar sounding words perform different functions.
Read back the safety-related parts required by the applicable rules, including relevant route, runway, level, heading, speed, pressure and code information. A readback is an opportunity to detect misunderstanding, not permission to substitute the value the pilot expected. If the controller detects an error, the loop must be corrected. A hearback error can leave both parties believing different instructions were accepted.
Conditions and aircraft identity
An aircraft callsign identifies the intended recipient. Do not act merely because a similar number, runway or level sounds familiar. Registration-based abbreviations depend on the permitted form and the initiating ground station; an airline flight-identification callsign is not abbreviated by guessing its last digits. Ambiguity between similar callsigns requires clarification.
LINE UP AND WAIT is distinct from a take-off clearance. HOLD SHORT requires remaining clear of the specified runway holding position. A conditional instruction contains a condition that must be correctly identified and satisfied; reading only the action removes its essential restriction. The classroom examples do not establish the traffic picture or clearance authority for a real runway.
Number transmission requires the actual rule
Do not reduce all number transmission to one memory slogan. Current SERA distinguishes headings, flight levels, pressure settings, codes and other quantities. Whole-hundred flight levels and the pressure setting of one thousand hectopascals have exceptions to simple digit-by-digit treatment. Whole-thousand transponder codes also have a stated exception. A legacy bank can therefore contain a familiar but outdated answer. Use the current rule for the quantity being transmitted and do not transfer maritime distress wording or another jurisdiction's local service conventions into an EASA exercise.