Article 2 Interpretation Original text. Later amendments are not shown. In these Rules, “the Principal Rules” means the Rules of Procedure (Air Force) 1972f1. Annotations Footnotes f1 S.I. 1972/419; relevant amending instruments are S.I. 1977/94, 1981/1219 and 1984/1669. ← Article 1 Article 2 Article 3 →