Case C-61/15 P: Judgment of the Court (Eighth Chamber Chamber) of 28 January 2016 — Heli-Flight GmbH & Co. KG v European Aviation Safety Agency (EASA) (Appeal — Civil aviation — Application for approval of flight conditions presented — Decision of the European Aviation Safety Agency — Rejection of an application — Compulsory preliminary administrative procedure — Possibility of an action before the court of the Union European — Role of the court — Adoption of measures of organisation of procedure — Obligation — Complex technical assessments)