COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Hot Air Balloons AD/BAL/10 Wire Rope Vent and Rip Lines 7/90 Applicability: All hot air balloons. Requirement: 1. Gain access to the lower section of the rip and vent control lines. 2. Examine the lower 7 metres for evidence of wire rope. 3. If wire rope is found replace affected lines with same diameter kevlar core polyester covered line or other suitable non-conductive alternative. Note: Kavanagh Balloons Engineering Order KB / 90 / 03 provides a suitable means of compliance. Compliance: Prior to 31 December 1990. Background: To reduce potential electrical shock hazards to the pilot and passengers, all metal control lines are replaced with non-conductive control lines.