The Bureau provides advice and assistance to the Secretary General and through him to Council and other bodies of the Organization and to ICAO Member States on constitutional, administrative and procedural matters, on problems of international law, air law, commercial law, labour law and related matters. The Bureau also conducts research and studies in the field of private and public international air law, prepares documentation for, and serves as the Secretariat of the Legal Committee: relevant bodies of the Assembly; and Diplomatic Conferences which adopt multilateral treaties on international air law.
The Bureau also provides policy guidance and advice on matters relating to the privileges and immunities granted to the Organization, national representatives and staff of the Secretariat. It acts as the focal point for ICAO's relations with the Host States of the Organization's Headquarters and of the Regional Offices, and is responsible for arranging and supervising the ICAO Familiarization Course.