AD reserved for radio-equipped avions. Procedures and special instructions Preferred QFU 333° due to environmental protection. Taxiing prohibited except on piste and voie de circulation. Special activities Aerobatics activity NR 6833: reserved for home-based avions and avions previously authorized by AD operator, 2700 ASFC/4500 AMSL - 0800-1900 SUM: - 1 HR. On clearance CLERMONT APP 120.5. Permanent radio contact. AEM activity NR 9715: 800 ASFC / 1900 AMSL.