What is Sierra?
In this glossary, Sierra refers to: The letter 'S' as spoken in the ICAO phonetic alphabet, used in ATC phraseology to identify taxiways, holding points, and aircraft callsigns.
How is Sierra used in aviation?
In aviation communication, this term appears in contexts such as: "Sau khi hạ cánh, rời đường băng 12 qua Sierra và liên hệ ground trên 121.9 để lăn về bãi đỗ."
Why does Sierra matter in aviation?
Sierra matters because it supports clear communication in Phonetic Alphabet contexts for Pilots, Air Traffic Controllers, and Cabin Crew. It also connects to aviation training and exam language such as ICAO Level 4, ICAO Level 5, ICAO Level 6, and EASA FCL.055.
Who uses Sierra?
Sierra is mainly used by Pilots, Air Traffic Controllers, and Cabin Crew.
What category does Sierra belong to?
In this glossary, Sierra is grouped under Phonetic Alphabet. Related pages in this category explain adjacent procedures, commands and operational concepts.
Where does this definition come from?
This definition is sourced from ICAO Doc 9432, FAA PCG and published by Protermify Aviation as a static aviation reference page.