1. A Board of Appeal shall consist of a Chairman and two other members.
2. The Chairman shall select for each case the other members and their respective alternates from the list of qualified members established pursuant to Article 47 (2).
3. Where the Board of Appeal considers that the nature of the appeal so requires, it may call up to two further members from the aforesaid list for that case.
4. The qualifications required for the members of each Board of Appeal, the powers of individual members in the preparatory phase of the decisions and the voting conditions shall be determined in the implementing rules pursuant to Article 114.