COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Hot Air Balloons AD/BAL/5 Amdt 1 Fuel Manifold System 6/86 Applicability: All balloons in Aerial work and Charter operations which are not fitted with dual blast valves or burners. Requirement: LPG cylinders used for flight shall be connected to a manifold system approved by the Secretary. Compliance: Prior to issue of a certificate of airworthiness. Background: This Directive has been amended to delete those balloons fitted with dual blast valves or burners.