Question juridique clé
Whether main intervention is admissible for the first time in federal appeal proceedings.
Solution extraite
Main intervention is not admissible at the appeal stage because Art. 85 OG incorporates only the BZP provisions relevant to appeal proceedings, and Arts. 17-18 BZP are not included.
Motifs extraits
Federal civil procedure before the Federal Court is governed exclusively by federal law. Although main intervention exists under Arts. 17-18 BZP, Art. 85 OG does not mention those provisions among the rules applicable on appeal; therefore main intervention is excluded at that stage, unlike secondary intervention under Art. 16 BZP.