Phraseology

Definition

Phraseology in aviation refers to the use of standardized, internationally recognized words and expressions for radiotelephony communication between pilots and air traffic control (ATC). It ensures clarity, brevity, and precision, reducing the risk of misunderstandings and enhancing safety—especially in high workload, multilingual, or emergency situations.
Phraseology is defined by ICAO (Annex 10, Doc 9432) and is implemented nationally by aviation authorities (e.g., Austro Control, DFS, FAA).

Purpose

Provide clear, concise communication during all phases of flight
Minimize language barriers and ambiguity
Support non-native English speakers with predictable terminology
Enhance situational awareness for all parties on frequency
Enable efficient traffic management, especially in complex or congested airspace

Core Principles of Standard Phraseology

✅ Say only what is necessary
✅ Use predefined words and formats
✅ Avoid slang, regional accents, or casual expressions
✅ Repeat critical elements (callsign, runway, heading, altitude, frequency)
✅ Use numbers properly (e.g., “two thousand five hundred” not “twenty-five hundred”)

Common Phraseology Examples

Situation	Phraseology
Initial contact	“Wien Tower, OE-ABC, at holding point runway 29, ready for departure.”
Climb clearance	“Climb flight level eight zero.”
Descent	“Descend to altitude three thousand feet QNH one zero one six.”
Heading assignment	“Turn left heading two four zero.”
Frequency change	“Contact Salzburg Radar on one two five decimal five.”
Taxi instruction	“Taxi to holding point runway 27 via Alpha and Bravo.”
Traffic report	“Traffic twelve o’clock, five miles, opposite direction, same level.”

Numerical Phraseology

Number	Say As
1,000	“One thousand”
5,500	“Five thousand five hundred”
80	“Eight zero” (flight level)
1013 (QNH)	“One zero one three”
121.875 (frequency)	“One two one decimal eight seven five”

Avoid phrases like:
❌ “Twenty-five hundred”
✅ “Two thousand five hundred”

Special Terms and Abbreviations

Term	Meaning
Wilco	Will comply
Roger	Received and understood
Negative	No / not approved
Standby	Wait, I will call you back
Squawk XXXX	Set transponder code XXXX
Break / Break Break	Separates different messages / urgent priority
Mayday / Pan Pan	Emergency / Urgency call

Language Rules

English is the international standard language for ATC phraseology
National language (e.g., German) may be used for domestic VFR operations unless otherwise required
Pilots must adhere to the language listed in their radiotelephony license

Incorrect vs. Correct Examples

Incorrect	Correct
“Okay, we're good to go.”	“Ready for departure runway 27.”
“Can you give me a left turn?”	“Request left turn.”
“I guess that's runway 09.”	“Confirm runway 09.”
“We’re pushing back now.”	“Request pushback.”