COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 35 and 36 Series Aeroplanes AD/LEARJET 35/21 Amdt 1 Engine Hydraulic Line Interference - Inspection 10/83 Applicability: All model 35 and 36 series aircraft as detailed in Gates Learjet Service Bulletins 35/36-29-1 and 35/36-29-2. Document: 1. Gates Learjet SB 35/36-29-1. Note: FAA AD 83-08-3 refers. 2. Gates Learjet SB 35/36-29-2. Compliance: Requirement Document No. 1: Within 100 hours time in service after 30 April 1983. Requirement Document No. 2: Within 100 hours time in service after 30 September 1983. Background: This directive has been raised in issue to include a further manufacturers SB related to interference between hydraulic lines and adjacent components in the tailcone area.