COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 3100 (Jetstream) Series Aeroplanes AD/JETSTREAM/6 Inboard Wing Leading Edge Hydraulic Lines 8/85 Applicability: All model Jetstream Series 3100 with S/Nos. 601 to 636. Requirement: British Aerospace SB29-JA840508 Rev. 1. Compliance: Within 300 flying hours from 31 AUGUST 1985. Background: Chafing of the suction and pressure hydraulic lines in the inboard wing leading edge can result in complete hydraulic failure due to loss of fluid.