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Aircraftman ranks below leading aircraftman and has a NATO rank code of OR-1. It is now a training rank only and no airmen in productive service hold this rank. Aircraftmen do not wear any rank insignia.
The rank was introduced on the formation of the RAF in 1918, replacing the Royal Flying Corps rank of air mechanic 2nd class. There were two grades: Aircraftman 1st class (AC1) and aircraftman 2nd class (AC2; also colloquially known as an "AC plonk").
Royal Air Force
In RAF slang, aircraftmen are sometimes called "erks".
The spelling "aircraftsman", despite being seen even in official documents, is incorrect in the RAF.
Royal Australian Air Force
The Royal Australian Air Force also uses both aircraftman and aircraftwoman.
Royal New Zealand Air Force