JAR
EASA defines “JAR” in 3 regulations, worded for each regulation's scope. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.
‘JAR’ means ‘Joint Aviation Requirements’;
“JAR” means “Joint Aviation Requirements”;
‘JAR’ means joint aviation requirements adopted by the Joint Aviation Authorities as applicable on 30 June 2009;
Defined in the same article
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